Head to head · Weather forecasts · October 2026 research run

Meteosource Weather MCP vs WeatherAPI.com

WeatherAPI.com scores 64.6 (B) on agent readiness against Meteosource Weather MCP's 50.9 (D), and leads in 4 of 7 scored categories. Meteosource Weather MCP leads on security & auth and maintenance & community. Both do weather forecasts.

Best weather and climate data APIs for AI agents · All 136 weather comparisons

Which one, for what

Meteosource Weather MCP D

Best for Agents that answer weather questions, plan around severe weather or estimate solar and wind output.

Ahead on

  • Security & auth, 42 against 37
  • Maintenance & community, 70 against 60

Watch for

Plain API key, no OAuth

WeatherAPI.com B

Best for Cheap, high-volume consumer forecasts where the location arrives as a city, postcode or IP.

Ahead on

  • Reliability, 80 against 35
  • Schema & documentation, 89 against 72
  • Agent ergonomics, 80 against 75
  • Transparency & trust, 65 against 32

Also in its favour

  • Free to start without a card

Watch for

Key only in the query string, keys can't be scoped, and no security.txt

Why the edge

Each category where one leads by five points or more, with the reason behind each side's score from its assessment. The numbers are in the table below; this is what they stand for.

Reliability WeatherAPI.com +45

Meteosource Weather MCP 35

status.meteosource.com wasn't reachable (0). No history (5). Daily call quotas per plan, and the README's plans-and-limits section (15). Documented limits on request size (400 location-days) with what to do, no 429 guidance (5 of 15). No SLA found (0). Version 0.1.2, not labelled beta (10). 0 + 5 + 15 + 5 + 0 + 10 = 35.

WeatherAPI.com 80

Status page at status.weatherapi.com on Better Stack, with api.weatherapi.com and the website as components (20). Its Previous incidents page says "No incidents reported" for September, October and November 2026 and its RSS feed has no items, so the page has never posted an incident, while the api.weatherapi.com monitor shows 99.839, 99.920 and 99.947 per cent beside its 90-day bar, and the October changelog says a brief outage of the internal key store used to reject valid keys. This run reads a page that has never posted an incident as 20, not a clean record (20 of 30, was 30). Monthly call quotas published for every plan, 100,000 free up to 10 million on Business and up to 500 million on High Volume (15). A spent quota returns 403 with error code 2007, distinct from auth errors, but there's no 429, Retry-After or backoff guidance (5 of 15). The terms promise 99.9 per cent to High Volume customers with service credits, and the plan table lists uptime per plan (10). Generally available (10). 20 + 20 + 15 + 5 + 10 + 10 = 80.

Transparency & trust WeatherAPI.com +33

Meteosource Weather MCP 32

The repository is MIT (copyright 2026 Meteosource) but holds docs and the registry manifest rather than the server; terms and privacy URLs weren't found (10 of 30). The MCP page says keys aren't stored in full and caches are per key (10 of 30). No deprecation policy (0). Subprocessors not found (5 of 20). 10 + 10 + 0 + 5 = 25.

WeatherAPI.com 65

Closed service with terms under English law. The MCP server is MIT (15). The privacy policy is undated, names no entity beyond WeatherAPI.com, logs IP and location, gives no retention periods and leaves template placeholders in its deletion section (8 of 30). The terms promise 12 months' written notice before an API deprecation and 90 days before changes to access rights (18 of 20). Stripe is named, and transfers to the USA, Russia, Japan, China and India are disclosed, but no hosting provider (8 of 20).

Schema & documentation WeatherAPI.com +17

Meteosource Weather MCP 72

Seven tools read from tools/list with JSON Schema inputs (25). No llms.txt found; the README is Markdown on GitHub (5 of 10). Descriptions say what each returns and which plan it needs (15 of 20). Typed inputs, no enums (10 of 15). A README table of error messages and fixes (10 of 15). Tagged releases v0.1.0 to v0.1.2, no changelog file (7 of 15). 25 + 5 + 15 + 10 + 10 + 7 = 72.

WeatherAPI.com 89

OpenAPI 3.1.0 at weatherapi.com/openapi.json, version 1.0.4 on 2 November 2026, 14 paths (solar and agriculture added) with a structured ErrorResponse on 400 and 401 everywhere and 403 on 10 (25). llms.txt at weatherapi.com/llms.txt, published April 2026 per the changelog (10). Endpoint descriptions state purpose and note plan limits (16 of 20). Eight or more enums for toggles, alert types and languages, though q is one free-form string that takes cities, postcodes, IPs and coordinates (11 of 15). 15 numbered error codes with HTTP status and message on the error codes page, plus an API explorer (14 of 15). A changelog dated by month, most recently October 2026, and a versioned /v1 path (13 of 15).

Maintenance & community Meteosource Weather MCP +10

Meteosource Weather MCP 70

Repository commit and tag v0.1.2 on 26 October 2026 (30). Three tags in 90 days (20). Repository issues not read (0). Official registry entry com.meteosource/weather (15). Small repository with server.json; server source not public (5 of 10). 30 + 20 + 0 + 15 + 5 = 70. Registry presence read from Anchor Terminal's own daily import of the official MCP registry (/api/v1/registry.json, 6 November 2026), not the registry's API.

WeatherAPI.com 60

The changelog has 13 entries dated October 2026, among them the Agriculture API (/agriculture.json), up to 5 API keys per account, cached key checks and self-serve High Volume plans, and one for August 2026, the Solar PV forecast API. The 1 October check saw July 2026 as the newest month, so the October entries came after it. Dated by month only, they are 2 to 32 days old on 2 November. The OpenAPI file, now version 1.0.4 with the solar and agriculture paths the 1 October check didn't see, was last modified on 17 October 2026 by its server header, so a published API change sits within 30 days (30, was 20). 13 entries in October alone, all after 3 August, clear three in 90 days without the month-level doubt that held the line at 15 on 1 October (20, was 15). A public changelog, and support by email we didn't test (8 of 15). The official MCP server isn't in the registry, where a third-party Pipeworx wrapper is (0.2.0 on 2 November), and the SDKs haven't changed since 2020 and 2021 (0). The npm package weatherapi-mcp is at 1.0.0, and its repository has had no commit since the initial release on 22 March 2026, with no CI (2 of 10). 30 + 20 + 8 + 0 + 2 = 60.

Agent ergonomics WeatherAPI.com +5

Meteosource Weather MCP 75

Seven tools, about 20 KB (25). Date ranges and location limits on history (12 of 20). Documented error messages with fixes (15 of 20). No annotations on the tools (8 of 20, all reads). Two values to connect and a cache per key; Meteosource SDKs not checked (15). 25 + 12 + 15 + 8 + 15 = 75.

WeatherAPI.com 80

current_fields, day_fields and hour_fields trim responses, and aqi, alerts and days keep them small. The official MCP server has 11 tools (22 of 25). days, hour, field filters and bulk requests on Pro+ (17 of 20). Numeric error codes such as 1006 (no location found) and 2007 (quota exceeded) let an agent tell the cases apart (18 of 20). Read-only GETs, and the bulk POST only reads. The MCP tools carry no readOnlyHint annotations (13 of 20). Only key and q are required, and SDKs exist for Node.js, Java, PHP and Go, but none has a commit since 2021 (10 of 15).

Security & auth Meteosource Weather MCP +5

Meteosource Weather MCP 42

One API key per account in a header, never in the URL (20 of 30). All tools are reads (10 of 20). Weather data only, no third-party text (10). No audit log (0). No security programme found (2 of 20). Keys travel to the hosted server, which says it doesn't store them in full. 20 + 10 + 10 + 0 + 2 = 42.

WeatherAPI.com 37

The key goes only in the key query parameter, so it lands in URLs and logs (20 less 10). Since October 2026 an account can hold up to 5 named keys, each regenerated or deleted on its own, but none can be scoped, and Business adds IP blocking (12 of 30). Read-only data (15 of 20). Alerts come from government agencies (10 of 15). Usage is shown for the whole account, and we found no per-call log in the docs (0). No security.txt (an HTML page-not-found answer on 2 November 2026), and no disclosure policy, bounty or certification found (0).

Score by category

CategoryWeight this runMeteosource Weather MCPWeatherAPI.comEdge
Reliability16%203580WeatherAPI.com +45
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27289WeatherAPI.com +17
Agent ergonomics13%16.27580WeatherAPI.com +5
Security & auth14%17.54237Meteosource Weather MCP +5
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87060Meteosource Weather MCP +10
Transparency & trust7%8.83265WeatherAPI.com +33
Negative events≤1500
TotalD 50.9/100B 64.6/100

Facts side by side

FactMeteosource Weather MCPWeatherAPI.com
KindMCP serverHTTP API
VendorMeteosourceWeatherAPI.com (Zoomash Ltd)
Hosted endpointhttps://mcp.meteosource.com/mcphttps://api.weatherapi.com/v1
TransportsStreamable HTTPHTTP
AuthAPI keyAPI key
PricingFreemiumFreemium
x402nono
LicenceProprietary service. The repository's MIT licence covers its docs and manifestnone
Tools exposed7none
Read-only variant documentednono
llms.txtnoyes
MCP registrycom.meteosource/weathernot listed
Terms last updatedno document linkedno date given
Privacy policy last updatedno document linkedno date given
Customer content may train modelsnot read yetnot found in the text
Terms restrict automated accessnot read yetyes
Terms restrict benchmarkingnot read yetnot found in the text
Terms or service can change without noticenot read yetyes
Arbitration or class-action waivernot read yetnot found in the text
Agent reviewsnone3.5/5 (2)

How the scores have moved

Verdicts

Meteosource Weather MCP

Meteosource's MCP server is a small, clear weather toolset, seven tools covering forecasts, alerts, air quality, history and renewable production, with error messages that tell the agent what to do. It uses a plain API key, has no status page we could reach, and its terms weren't found.

WeatherAPI.com

WeatherAPI.com covers forecasts, history, marine, solar and agriculture data, with 100,000 free calls a month and no card, plans from $7 a month and an OpenAPI 3.1 file. The key travels only in the query string, the status page has never posted an incident, and no security.txt or disclosure policy was found.

Before you call either

Meteosource Weather MCP

  1. Call search_places first to resolve a location
  2. Split history requests over 400 location-days into shorter ranges
  3. Production tools need the Renewables plan; check which tools the key exposes
  4. Send the key in a header, never in a URL

WeatherAPI.com

  1. Pass current_fields, day_fields or hour_fields to cut the response to what you need
  2. Treat a 403 with error code 2007 as the monthly quota, not a bad key. There's no 429
  3. Reuse the id from search.json (q=id:NNN) to avoid ambiguous city names
  4. Cache history freely, current for under an hour and forecasts for under a day, to stay inside the terms
  5. Keep one named key per app (up to 5 per account); keys share one monthly quota, so a runaway agent on one key can exhaust them all.

Questions

Which is better for AI agents, Meteosource Weather MCP or WeatherAPI.com?

WeatherAPI.com scores 64.6 (B) on agent readiness against Meteosource Weather MCP's 50.9 (D), and leads in 4 of 7 scored categories. Meteosource Weather MCP leads on security & auth and maintenance & community.

Do Meteosource Weather MCP and WeatherAPI.com need an API key?

Both need an API key.

Can an agent call Meteosource Weather MCP and WeatherAPI.com without installing anything?

Yes. Meteosource Weather MCP has a hosted endpoint at https://mcp.meteosource.com/mcp and WeatherAPI.com at https://api.weatherapi.com/v1.

Other comparisons with Meteosource Weather MCP or WeatherAPI.com

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