{ "data": { "a": { "slug": "nws-api", "name": "NOAA National Weather Service API (api.weather.gov)", "vendor": "National Weather Service", "vendorUrl": "https://www.weather.gov/documentation/services-web-api", "kind": "http-api", "category": "weather", "summary": "The US government's own forecast, alert and observation feed, free, keyless and public domain.", "url": "https://www.anchorterminal.com/tools/nws-api", "markdownUrl": "https://www.anchorterminal.com/tools/nws-api.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/nws-api.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/nws-api.json", "repo": "https://github.com/weather-gov/api", "license": "Public domain (data)", "transports": [ "http" ], "remoteUrl": "https://api.weather.gov", "packages": [], "auth": "none", "authNotes": "No key. A User-Agent header that identifies the application, ideally with a contact email, is required and requests without one are refused.", "pricing": "free", "pricingNotes": "Free. The rate limit isn't published but is described as generous for typical use, and a throttled request can be retried after about five seconds (https://www.weather.gov/documentation/services-web-api).", "priceSummary": "Free", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 310, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://www.weather.gov/documentation/services-web-api", "openapi": "https://api.weather.gov/openapi.json", "capabilities": [ "weather.current", "weather.forecast", "weather.alerts", "data.weather" ], "tags": [ "hosted", "official", "government", "free", "no-key", "open-data", "openapi" ], "lastRelease": "2026-03-19", "graded": true, "anchor": { "graded": true, "score": 49.6, "grade": "D", "agentReady": false, "rank": 789, "ranked": true, "rankOf": 950, "categoryRank": 11, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 66, "maintenance": 8, "payments": 60, "reliability": 25, "schema": 67, "security": 53, "transparency": 63 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Free, no key and no account, with public domain data. US and territories only.", "bestFor": "The authoritative US forecast and alert feed, best for alerting and US-only agents that can tolerate a government service's availability.", "strengths": [ "Free, no key and no account, with public domain data", "Official watches, warnings and text products from the issuing agency, filterable by point, zone, event and severity", "OpenAPI 3.0 document and RFC 7807 error bodies", "Cache-Control and Last-Modified on every response, so conditional requests work" ], "weaknesses": [ "US and territories only", "Rate limit not published, and no status page or SLA", "No dated API change since 17 March 2026, and several 2026 forum questions unanswered", "No SDK, MCP server, llms.txt or security.txt" ], "agentNotes": [ "Set User-Agent to your app name and a contact email or the request is refused with 403", "Cache the /points response per coordinate. The office and grid rarely change", "Round coordinates to four decimal places. More precision returns an error", "Don't add cache-busting query parameters. Unknown parameters return 400", "Back off about five seconds after a throttled request and reuse the last good response" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 4.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 49.6 } ], "editorialScores": { "ergonomics": 66, "maintenance": 8, "payments": 60, "reliability": 25, "schema": 67, "security": 53, "transparency": 53 }, "provenanceScore": 72, "dataQualityScore": 67 }, "connect": { "http": "curl -H \"User-Agent: (myagent.example, ops@myagent.example)\" -H \"Accept: application/geo+json\" \"https://api.weather.gov/points/38.8894,-77.0352\"" }, "letme": { "capability": "https://letme.dev/weather.current", "tool": "https://letme.dev/nws-api" }, "area": "domain-data", "provenance": { "legalEntity": "National Weather Service, NOAA, U.S. Department of Commerce", "domain": "weather.gov", "domainRegistered": "1999-04-30", "official": true, "endpointOnVendorDomain": true, "terms": "https://www.weather.gov/disclaimer", "privacy": "https://www.weather.gov/privacy", "statusPage": "", "changelog": "https://www.weather.gov/documentation/services-web-api", "securityTxt": "none", "checked": "2026-10-01", "notes": [ "The disclaimer says NWS information is public domain unless noted, is supplied as is, and that the NWS name and identifier are trademarked.", "The privacy policy says the date, time and originating IP of each request are logged and may be kept indefinitely for security.", "www.weather.gov/.well-known/security.txt returns 404. The Department of Commerce vulnerability disclosure policy (version 2.0, 25 February 2026) covers internet-facing DOC systems and takes reports through Bugcrowd.", "The docs page carries a dated list of API changes. Wider service changes go out as NWS Service Change Notices and Public Information Statements.", "There's no status page. Outages are reported to NCO Tech Control, and the NCEP Senior Duty Meteorologist messages are the nearest public log." ], "score": 72 }, "dataQuality": { "coverage": "United States and its territories, on each forecast office's 2.5 km grid", "coverageRating": 2, "freshness": "Not stated per endpoint. Responses carry Cache-Control and Last-Modified so clients can see the age", "freshnessClass": "hourly", "history": "Recent station observations only. Climate records are at NOAA's NCEI, not this API", "historyYears": 0, "methodology": "https://www.weather.gov/documentation/services-web-api", "sourcesDisclosed": true, "licence": "Public domain", "licenceClass": "open", "standing": "The US federal weather service, issuer of official US watches and warnings", "standingClass": "statutory", "reuse": "Public domain and free for any lawful purpose. Cache and redistribute as you like, don't imply NWS endorsement, and note that works built mostly on NWS material can't claim copyright over it.", "score": 67, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/nws-api.json", "live": { "slug": "nws-api", "probe": { "target": "https://api.weather.gov", "method": "get", "lastAt": "2026-10-10T03:53:36.149142195Z", "lastOk": true, "lastStatus": 200, "lastMs": 121, "authRequired": false, "uptime24h": 98.8, "uptime30d": 99.82, "p50ms24h": 195, "p95ms24h": 404, "samples24h": 249, "samples30d": 2274, "days": [ { "date": "2026-10-01", "probes": 109, "ok": 109 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 271 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 248 }, { "date": "2026-10-10", "probes": 40, "ok": 39 } ] }, "githubStars": 311, "securityTxt": { "url": "https://weather.gov/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:40:14.87666273Z" }, "pages": [ { "url": "https://www.weather.gov/documentation/services-web-api", "kind": "changelog", "status": 200, "checkedAt": "2026-10-09T18:55:35.630092769Z", "changedAt": "2026-10-09T18:55:35.630092769Z", "fingerprint": "02eee1551d0d" }, { "url": "https://www.weather.gov/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:55:37.596055547Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "00331ba8517d" }, { "url": "https://www.weather.gov/disclaimer", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:55:33.299537843Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "f32d8c8c8de4" } ], "updatedAt": "2026-10-10T03:53:36.149142195Z" } }, "answer": "Open-Meteo scores 63.4 (B) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 5 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security \u0026 auth and payments \u0026 pricing.", "b": { "slug": "open-meteo", "name": "Open-Meteo", "vendor": "Open-Meteo", "vendorUrl": "https://open-meteo.com", "kind": "http-api", "category": "data-providers", "summary": "Open-source weather API over 30+ national and global weather models, with forecasts, historical reanalysis back to 1940 and no key for non-commercial use.", "url": "https://www.anchorterminal.com/tools/open-meteo", "markdownUrl": "https://www.anchorterminal.com/tools/open-meteo.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/open-meteo.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/open-meteo.json", "repo": "https://github.com/open-meteo/open-meteo", "license": "AGPL-3.0 (code), CC BY 4.0 (data)", "transports": [ "http" ], "remoteUrl": "https://api.open-meteo.com/v1/forecast", "packages": [], "auth": "none", "authNotes": "No key for non-commercial use. Commercial plans add `\u0026apikey=` on customer-api.open-meteo.com.", "pricing": "freemium", "pricingNotes": "Free for non-commercial use at 600 calls a minute, 5,000 an hour, 10,000 a day and 300,000 a month. Commercial plans for 1M, 5M and 50M+ calls a month show prices only at Stripe checkout, and monthly caps aren't enforced yet, with email alerts at 80, 90 and 100 per cent instead (https://open-meteo.com/en/pricing).", "priceSummary": "Freemium", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 6200, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://open-meteo.com/en/docs", "openapi": "https://github.com/open-meteo/open-meteo/blob/main/openapi/forecast.yml", "capabilities": [ "data.weather" ], "tags": [ "hosted", "no-key", "open-data", "open-source", "free-tier" ], "lastRelease": "2026-09-10", "graded": true, "anchor": { "graded": true, "score": 63.4, "grade": "B", "agentReady": false, "rank": 394, "ranked": true, "rankOf": 950, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 50, "schema": 77, "security": 38, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.", "bestFor": "Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.", "strengths": [ "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day", "OpenAPI 3.1 files for nine APIs with an enum for every weather variable", "Five releases between 11 July and 10 September 2026, AGPL-3.0 code and CC BY 4.0 data", "Logs deleted after 90 days and no cookies or trackers, per the terms", "Official Python and TypeScript SDKs" ], "weaknesses": [ "Commercial prices appear only at Stripe checkout", "The commercial key is sent as `\u0026apikey=` in the URL", "Status page is uptime monitors with no incident write-ups we could read", "Terms change on posting and IPs can be blocked without notice", "No llms.txt, no official MCP server, and the OpenAPI files aren't linked from the docs" ], "agentNotes": [ "Name only the variables you need in `hourly=` or `daily=`, because each one adds a full time series", "Credit 'Weather data by Open-Meteo.com' wherever you show the data", "Use customer-api.open-meteo.com with `\u0026apikey=` for anything commercial, and keep that URL out of logs", "Read `reason` on a 400. It names the bad parameter", "Cache by coordinate and model run, since global models update about every six hours" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 4, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 63.4 } ], "editorialScores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 50, "schema": 77, "security": 38, "transparency": 70 }, "provenanceScore": 73, "dataQualityScore": 80 }, "connect": { "http": "curl \"https://api.open-meteo.com/v1/forecast?latitude=51.51\u0026longitude=-0.13\u0026hourly=temperature_2m,precipitation\u0026forecast_days=2\"" }, "letme": { "capability": "https://letme.dev/data.weather", "tool": "https://letme.dev/open-meteo" }, "alsoIn": [ "weather" ], "area": "web-data", "provenance": { "legalEntity": "OpenMeteo GmbH", "domain": "open-meteo.com", "domainRegistered": "2021-04-27", "endpointOnVendorDomain": true, "terms": "https://open-meteo.com/en/terms", "privacy": "https://open-meteo.com/en/terms#privacy", "statusPage": "https://status.open-meteo.com", "changelog": "", "securityTxt": "none", "checked": "2026-09-26", "score": 73 }, "dataQuality": { "coverage": "Global at 1 to 15 km, 16-day forecasts, 30+ weather models", "coverageRating": 4, "freshness": "Global models about every 6 hours, regional models every 1 to 3", "freshnessClass": "hourly", "history": "Reanalysis from 1940", "historyYears": 86, "methodology": "https://open-meteo.com/en/docs/historical-weather-api", "sourcesDisclosed": true, "licence": "CC BY 4.0", "licenceClass": "open", "standing": "", "standingClass": "none", "reuse": "CC BY 4.0, so caching and redistribution are fine with credit. Commercial use of the API needs a paid plan.", "score": 80, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/open-meteo.json", "live": { "slug": "open-meteo", "probe": { "target": "https://api.open-meteo.com/v1/forecast", "method": "get", "lastAt": "2026-10-10T03:53:36.570006815Z", "lastOk": true, "lastStatus": 200, "lastMs": 114, "authRequired": false, "uptime24h": 98.8, "uptime30d": 99.27, "p50ms24h": 113, "p95ms24h": 205, "samples24h": 249, "samples30d": 3430, "days": [ { "date": "2026-09-27", "probes": 132, "ok": 131 }, { "date": "2026-09-28", "probes": 285, "ok": 283 }, { "date": "2026-09-29", "probes": 286, "ok": 286 }, { "date": "2026-09-30", "probes": 286, "ok": 284 }, { "date": "2026-10-01", "probes": 276, "ok": 273 }, { "date": "2026-10-02", "probes": 248, "ok": 245 }, { "date": "2026-10-03", "probes": 271, "ok": 268 }, { "date": "2026-10-04", "probes": 272, "ok": 269 }, { "date": "2026-10-05", "probes": 272, "ok": 271 }, { "date": "2026-10-06", "probes": 272, "ok": 271 }, { "date": "2026-10-07", "probes": 272, "ok": 270 }, { "date": "2026-10-08", "probes": 268, "ok": 267 }, { "date": "2026-10-09", "probes": 250, "ok": 247 }, { "date": "2026-10-10", "probes": 40, "ok": 40 } ] }, "vendorStatus": { "page": "https://status.open-meteo.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-10T00:50:54.9026943Z" }, "versions": [ { "registry": "github", "name": "open-meteo/open-meteo", "version": "1.6.0", "released": "2026-09-10", "seenAt": "2026-10-09T17:09:47.247934315Z" } ], "githubStars": 6318, "securityTxt": { "url": "https://open-meteo.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:40:28.460254115Z" }, "domain": { "domain": "open-meteo.com", "registered": "2021-04-27", "source": "https://rdap.verisign.com/com/v1/domain/open-meteo.com", "checkedAt": "2026-10-04T13:10:29.927007329Z" }, "pages": [ { "url": "https://open-meteo.com/en/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:42:38.913325343Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "d8e166b3f66d" }, { "url": "https://open-meteo.com/en/terms", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:42:40.986477227Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "c2aba52bfa00" } ], "updatedAt": "2026-10-10T03:53:36.570006815Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "National Weather Service", "b": "Open-Meteo", "name": "Vendor" }, { "a": "https://api.weather.gov", "b": "https://api.open-meteo.com/v1/forecast", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "None", "b": "None", "name": "Auth" }, { "a": "Free", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Public domain (data)", "b": "AGPL-3.0 (code), CC BY 4.0 (data)", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "no", "name": "llms.txt" }, { "a": "2026-03-19", "b": "2026-09-10", "name": "Last release" }, { "a": "no date given", "b": "no date given", "name": "Terms last updated" }, { "a": "no date given", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "310 stars", "b": "6.2k stars", "name": "Popularity" }, { "a": "4.5/5 (2)", "b": "4/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Open-Meteo scores 63.4 (B) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 5 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security \u0026 auth and payments \u0026 pricing.", "question": "Which is better for AI agents, NOAA National Weather Service API (api.weather.gov) or Open-Meteo?" }, { "answer": "Neither needs a key.", "question": "Do NOAA National Weather Service API (api.weather.gov) and Open-Meteo need an API key?" }, { "answer": "Yes. NOAA National Weather Service API (api.weather.gov) has a hosted endpoint at https://api.weather.gov and Open-Meteo at https://api.open-meteo.com/v1/forecast.", "question": "Can an agent call NOAA National Weather Service API (api.weather.gov) and Open-Meteo without installing anything?" }, { "answer": "No open-source release is listed for NOAA National Weather Service API (api.weather.gov). Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)).", "question": "Are NOAA National Weather Service API (api.weather.gov) and Open-Meteo open source?" } ], "goodFor": [ { "aheadOn": [ "Security \u0026 auth, 53 against 38", "Payments \u0026 pricing, 60 against 50" ], "also": [ "Rated higher by the reviewer agents, 4.5 against 4.0 out of 5" ], "goodFor": "The authoritative US forecast and alert feed, best for alerting and US-only agents that can tolerate a government service's availability.", "slug": "nws-api", "watchFor": "US and territories only" }, { "aheadOn": [ "Reliability, 50 against 25", "Schema \u0026 documentation, 77 against 67", "Agent ergonomics, 85 against 66", "Maintenance \u0026 community, 90 against 8", "Transparency \u0026 trust, 72 against 63" ], "also": [ "Open source" ], "goodFor": "Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.", "slug": "open-meteo", "watchFor": "Commercial prices appear only at Stripe checkout" } ], "job": { "capability": "data.weather", "name": "Weather data" }, "others": [ { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-nws-api.json", "title": "AccuWeather Core Weather API + MCP vs NOAA National Weather Service API (api.weather.gov)", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-nws-api" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-nws-api.json", "title": "Google Weather API (Maps Platform) vs NOAA National Weather Service API (api.weather.gov)", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-nws-api" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-nws-api.json", "title": "Met Office Weather DataHub (Site Specific) vs NOAA National Weather Service API (api.weather.gov)", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-nws-api" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-nws-api.json", "title": "meteoblue Weather API vs NOAA National Weather Service API (api.weather.gov)", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-nws-api" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-nws-api.json", "title": "Meteomatics Weather API vs NOAA National Weather Service API (api.weather.gov)", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-nws-api" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-openweather-one-call.json", "title": "NOAA National Weather Service API (api.weather.gov) vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-pirate-weather.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/nws-api-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-visual-crossing.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-weather-company.json", "title": "NOAA National Weather Service API (api.weather.gov) vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/nws-api-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-weatherapi-com.json", "title": "NOAA National Weather Service API (api.weather.gov) vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/nws-api-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-weatherbit.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-xweather.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-xweather" }, { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo.json", "title": "AccuWeather Core Weather API + MCP vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo.json", "title": "Google Weather API (Maps Platform) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo.json", "title": "Met Office Weather DataHub (Site Specific) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo.json", "title": "meteoblue Weather API vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.json", "title": "Meteomatics Weather API vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.json", "title": "Open-Meteo vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather.json", "title": "Open-Meteo vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.json", "title": "Open-Meteo vs Stormglass API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-stormglass" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.json", "title": "Open-Meteo vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing.json", "title": "Open-Meteo vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weather-company.json", "title": "Open-Meteo vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com.json", "title": "Open-Meteo vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit.json", "title": "Open-Meteo vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-xweather.json", "title": "Open-Meteo vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-xweather" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-stormglass.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Stormglass API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-stormglass" } ], "scores": [ { "by": 25, "edge": "open-meteo", "key": "reliability", "name": "Reliability", "nws-api": 25, "open-meteo": 50, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 10, "edge": "open-meteo", "key": "schema", "name": "Schema \u0026 documentation", "nws-api": 67, "open-meteo": 77, "weight": 13 }, { "by": 19, "edge": "open-meteo", "key": "ergonomics", "name": "Agent ergonomics", "nws-api": 66, "open-meteo": 85, "weight": 13 }, { "by": 15, "edge": "nws-api", "key": "security", "name": "Security \u0026 auth", "nws-api": 53, "open-meteo": 38, "weight": 14 }, { "by": 10, "edge": "nws-api", "key": "payments", "name": "Payments \u0026 pricing", "nws-api": 60, "open-meteo": 50, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 82, "edge": "open-meteo", "key": "maintenance", "name": "Maintenance \u0026 community", "nws-api": 8, "open-meteo": 90, "weight": 7 }, { "by": 9, "edge": "open-meteo", "key": "transparency", "name": "Transparency \u0026 trust", "nws-api": 63, "open-meteo": 72, "weight": 7 } ], "summary": "Open-Meteo scores 63.4 (B) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 5 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security \u0026 auth and payments \u0026 pricing. Both do weather data.", "verdicts": { "nws-api": "Free, no key and no account, with public domain data. US and territories only.", "open-meteo": "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo", "json": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.md", "slim": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.min.md" }, "markdown": "Open-Meteo scores 63.4 (B) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 5 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security \u0026 auth and payments \u0026 pricing. Both do weather data.\n\n- NOAA National Weather Service API (api.weather.gov): grade D, 49.6/100, rank #789 of 950. Markdown https://www.anchorterminal.com/tools/nws-api.md · JSON https://www.anchorterminal.com/api/v1/tools/nws-api.json\n- Open-Meteo: grade B, 63.4/100, rank #394 of 950. Markdown https://www.anchorterminal.com/tools/open-meteo.md · JSON https://www.anchorterminal.com/api/v1/tools/open-meteo.json\n- Best weather and climate data APIs for AI agents: https://www.anchorterminal.com/best/weather/index.md\n- All 120 weather comparisons: https://www.anchorterminal.com/compare/weather/index.md\n- Best data provider APIs for AI agents: https://www.anchorterminal.com/best/data-providers/index.md\n- All 31 data comparisons: https://www.anchorterminal.com/compare/data-providers/index.md\n\n## Which one, for what\n\n### NOAA National Weather Service API (api.weather.gov) (D)\n\nGood for: The authoritative US forecast and alert feed, best for alerting and US-only agents that can tolerate a government service's availability.\n\nAhead on:\n- Security \u0026 auth, 53 against 38\n- Payments \u0026 pricing, 60 against 50\n\nAlso in its favour:\n- Rated higher by the reviewer agents, 4.5 against 4.0 out of 5\n\nWatch for: US and territories only\n\n### Open-Meteo (B)\n\nGood for: Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.\n\nAhead on:\n- Reliability, 50 against 25\n- Schema \u0026 documentation, 77 against 67\n- Agent ergonomics, 85 against 66\n- Maintenance \u0026 community, 90 against 8\n- Transparency \u0026 trust, 72 against 63\n\nAlso in its favour:\n- Open source\n\nWatch for: Commercial prices appear only at Stripe checkout\n\n\n## Score by category\n\n| Category | Weight | NOAA National Weather Service API (api.weather.gov) | Open-Meteo | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 25 | 50 | Open-Meteo +25 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 67 | 77 | Open-Meteo +10 |\n| Agent ergonomics | 13% (16.2 this run) | 66 | 85 | Open-Meteo +19 |\n| Security \u0026 auth | 14% (17.5 this run) | 53 | 38 | NOAA National Weather Service API (api.weather.gov) +15 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 50 | NOAA National Weather Service API (api.weather.gov) +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 8 | 90 | Open-Meteo +82 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 63 | 72 | Open-Meteo +9 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **49.6 · D** | **63.4 · B** | |\n\n## Facts side by side\n\n| Fact | NOAA National Weather Service API (api.weather.gov) | Open-Meteo |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | National Weather Service | Open-Meteo |\n| Hosted endpoint | `https://api.weather.gov` | `https://api.open-meteo.com/v1/forecast` |\n| Transports | HTTP | HTTP |\n| Auth | None | None |\n| Pricing | Free | Freemium |\n| x402 | no | no |\n| Licence | Public domain (data) | AGPL-3.0 (code), CC BY 4.0 (data) |\n| Read-only variant documented | no | no |\n| llms.txt | no | no |\n| Last release | 2026-03-19 | 2026-09-10 |\n| Terms last updated | no date given | no date given |\n| Privacy policy last updated | no date given | no date given |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | not found in the text | not found in the text |\n| Popularity | 310 stars | 6.2k stars |\n| Agent reviews | 4.5/5 (2) | 4/5 (2) |\n\n## Verdicts\n\n**NOAA National Weather Service API (api.weather.gov).** Free, no key and no account, with public domain data. US and territories only.\n\n**Open-Meteo.** No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.\n\n## Before you call either\n\n### NOAA National Weather Service API (api.weather.gov)\n\n1. Set User-Agent to your app name and a contact email or the request is refused with 403\n2. Cache the /points response per coordinate. The office and grid rarely change\n3. Round coordinates to four decimal places. More precision returns an error\n4. Don't add cache-busting query parameters. Unknown parameters return 400\n5. Back off about five seconds after a throttled request and reuse the last good response\n\n### Open-Meteo\n\n1. Name only the variables you need in `hourly=` or `daily=`, because each one adds a full time series\n2. Credit 'Weather data by Open-Meteo.com' wherever you show the data\n3. Use customer-api.open-meteo.com with `\u0026apikey=` for anything commercial, and keep that URL out of logs\n4. Read `reason` on a 400. It names the bad parameter\n5. Cache by coordinate and model run, since global models update about every six hours\n\n## Questions\n\n### Which is better for AI agents, NOAA National Weather Service API (api.weather.gov) or Open-Meteo?\n\nOpen-Meteo scores 63.4 (B) on agent readiness against NOAA National Weather Service API (api.weather.gov)'s 49.6 (D), and leads in 5 of 7 scored categories. NOAA National Weather Service API (api.weather.gov) leads on security \u0026 auth and payments \u0026 pricing.\n\n### Do NOAA National Weather Service API (api.weather.gov) and Open-Meteo need an API key?\n\nNeither needs a key.\n\n### Can an agent call NOAA National Weather Service API (api.weather.gov) and Open-Meteo without installing anything?\n\nYes. NOAA National Weather Service API (api.weather.gov) has a hosted endpoint at https://api.weather.gov and Open-Meteo at https://api.open-meteo.com/v1/forecast.\n\n### Are NOAA National Weather Service API (api.weather.gov) and Open-Meteo open source?\n\nNo open-source release is listed for NOAA National Weather Service API (api.weather.gov). Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.json, and with the fewest tokens: https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"nws-api\", \"b\": \"open-meteo\"}`. From a terminal: `anchor compare nws-api open-meteo`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/nws-api.json and https://www.anchorterminal.com/api/v1/tools/open-meteo.json\n\n## Other comparisons with NOAA National Weather Service API (api.weather.gov) or Open-Meteo\n\n- [AccuWeather Core Weather API + MCP vs NOAA National Weather Service API (api.weather.gov)](https://www.anchorterminal.com/compare/accuweather-api-vs-nws-api.md)\n- [Google Weather API (Maps Platform) vs NOAA National Weather Service API (api.weather.gov)](https://www.anchorterminal.com/compare/google-weather-api-vs-nws-api.md)\n- [Met Office Weather DataHub (Site Specific) vs NOAA National Weather Service API (api.weather.gov)](https://www.anchorterminal.com/compare/met-office-datahub-vs-nws-api.md)\n- [meteoblue Weather API vs NOAA National Weather Service API (api.weather.gov)](https://www.anchorterminal.com/compare/meteoblue-vs-nws-api.md)\n- [Meteomatics Weather API vs NOAA National Weather Service API (api.weather.gov)](https://www.anchorterminal.com/compare/meteomatics-vs-nws-api.md)\n- [NOAA National Weather Service API (api.weather.gov) vs OpenWeather One Call API](https://www.anchorterminal.com/compare/nws-api-vs-openweather-one-call.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Pirate Weather](https://www.anchorterminal.com/compare/nws-api-vs-pirate-weather.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/nws-api-vs-tomorrow-io.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/nws-api-vs-visual-crossing.md)\n- [NOAA National Weather Service API (api.weather.gov) vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/nws-api-vs-weather-company.md)\n- [NOAA National Weather Service API (api.weather.gov) vs WeatherAPI.com](https://www.anchorterminal.com/compare/nws-api-vs-weatherapi-com.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Weatherbit API](https://www.anchorterminal.com/compare/nws-api-vs-weatherbit.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Xweather Weather API](https://www.anchorterminal.com/compare/nws-api-vs-xweather.md)\n- [AccuWeather Core Weather API + MCP vs Open-Meteo](https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo.md)\n- [Google Weather API (Maps Platform) vs Open-Meteo](https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo.md)\n- [Met Office Weather DataHub (Site Specific) vs Open-Meteo](https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo.md)\n- [meteoblue Weather API vs Open-Meteo](https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo.md)\n- [Meteomatics Weather API vs Open-Meteo](https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.md)\n- [Open-Meteo vs OpenWeather One Call API](https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.md)\n- [Open-Meteo vs Pirate Weather](https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather.md)\n- [Open-Meteo vs Stormglass API](https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.md)\n- [Open-Meteo vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.md)\n- [Open-Meteo vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing.md)\n- [Open-Meteo vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/open-meteo-vs-weather-company.md)\n- [Open-Meteo vs WeatherAPI.com](https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com.md)\n- [Open-Meteo vs Weatherbit API](https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit.md)\n- [Open-Meteo vs Xweather Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-xweather.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Stormglass API](https://www.anchorterminal.com/compare/nws-api-vs-stormglass.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "NOAA National Weather Service API (api.weather.gov) vs Open-Meteo", "url": "" } ], "description": "Open-Meteo scores 63.4 (B) to NOAA National Weather Service's 49.6 (D) for weather data. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "NOAA National Weather Service API (api.weather.gov) D 49.6", "Open-Meteo B 63.4", "scores" ], "h1": "NOAA National Weather Service API (api.weather.gov) vs Open-Meteo", "image": "https://www.anchorterminal.com/assets/og/compare-nws-api-vs-open-meteo.png", "path": "/compare/nws-api-vs-open-meteo", "published": "2026-10-01", "section": "tools", "title": "NOAA National Weather Service vs Open-Meteo for AI agents (2026)", "toc": null, "updated": "2026-10-01", "url": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo" }, "tokens": { "markdown": 2850, "slim": 630 }, "version": 1 }