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Head to head · Weather current · October 2026 research run

meteoblue Weather API vs Tomorrow.io Weather API

meteoblue Weather API scores 61.7 (C) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 5 of 7 scored categories. Tomorrow.io Weather API leads on agent ergonomics. Both do weather current.

meteoblue Weather APImeteoblue AG · HTTP API C61.7/100#360 of 722 Tomorrow.io Weather APIThe Tomorrow Companies Inc. · HTTP API D51.4/100#578 of 722

Which one, for what

meteoblue Weather API C

Good for Energy, agriculture and marine applications that need solar, wind, soil, sea or ensemble variables at a point, with history back to 1940 on a paid plan.

Ahead on

  • Reliability, 75 against 55
  • Security & auth, 51 against 34
  • Payments & pricing, 34 against 20
  • Maintenance & community, 57 against 27

Watch for

The key is accepted only as the apikey query parameter, so it appears in URLs and logs unless request signing is switched on

Tomorrow.io Weather API D

Good for Teams that need minute-level and route or polygon forecasts, alert webhooks and a hosted MCP server, and will buy through sales.

Ahead on

  • Agent ergonomics, 73 against 66

Watch for

No public price for paid use. The plan table lists Free and Enterprise, the second by quote

Score by category

CategoryWeight this runmeteoblue Weather APITomorrow.io Weather APIEdge
Reliability16%207555meteoblue Weather API +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27775meteoblue Weather API +2
Agent ergonomics13%16.26673Tomorrow.io Weather API +7
Security & auth14%17.55134meteoblue Weather API +17
Payments & pricing10%12.53420meteoblue Weather API +14
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.85727meteoblue Weather API +30
Transparency & trust7%8.86163Tomorrow.io Weather API +2
Negative events≤1500
Total61.7 · C51.4 · D

Facts side by side

Factmeteoblue Weather APITomorrow.io Weather API
KindHTTP APIHTTP API
Vendormeteoblue AGThe Tomorrow Companies Inc.
Hosted endpointhttps://my.meteoblue.comhttps://api.tomorrow.io/v4
TransportsHTTPHTTP
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary service under meteoblue's general terms and conditions. The Python SDK for the Dataset API is MITProprietary service under Tomorrow.io's subscription terms
Tools exposednone11
Read-only variant documentednono
llms.txtyesyes
Last release2026-08-222026-07-14
Terms last updated2018-05-24couldn't be read
Privacy policy last updated2024-05-15couldn't be read
Customer content may train modelsnot found in the textcouldn't be read
Terms restrict automated accessnot found in the textcouldn't be read
Terms restrict benchmarkingnot found in the textcouldn't be read
Terms or service can change without noticenot found in the textcouldn't be read
Arbitration or class-action waivernot found in the textcouldn't be read
Popularity8 stars, 512 PyPI/wknone

Verdicts

meteoblue Weather API

Eight of the APIs publish OpenAPI 3.1 specs, and the Forecast API spec lists the credit cost of every package. A public Pingdom page shows monthly uptime per API. The key travels only in the query string, the free trial covers nine forecast packages, and no security.txt, certification or DPA was found.

Tomorrow.io Weather API

A public OpenAPI 3.1 file, Markdown docs with llms.txt and a hosted MCP server with 11 tools suit agents, and a free plan exists. Paid prices are by quote only, free keys are barred from commercial use, the docs give no numeric rate limits, and the status page lists 50 incidents in 85 days, mostly stale or degraded data.

Before you call either

meteoblue Weather API

  1. Pass lat, lon and apikey to https://my.meteoblue.com/packages/<package>. Join packages with commas, such as basic-1h,basic-day, to get several in one call
  2. Budget credits before calling. One call costs 4,000 to 96,000 credits by package, and the free trial holds 10 million for a year. Read MB-Credits-Accounted on each response
  3. Set forecastDays and pick the coarsest resolution that does the job. Without it the API returns every forecast day it has
  4. Call with a 30-second timeout, wait 30 seconds after an error and stop after 10 retries, as the availability page advises. The default limit is 500 calls a minute
  5. Keep the key out of logs, since it is part of every URL. Ask for a shared secret and send expire and sig if URLs may be seen by others

Tomorrow.io Weather API

  1. Send the key in the apikey header, not the query string, so it stays out of URLs and logs
  2. Request only the fields and timesteps needed on POST /timelines. Free plans cover 24 hours back and 5 days ahead at 1h and 1d
  3. Split archive requests. POST /historical takes at most 31 days per call and deducts tokens, 1 for a point and 10 for a polygon
  4. Treat 401 with code 401001 as a missing or bad key. The docs say 403, the live API answered 401 on 8 October 2026
  5. On 429 back off without a hint. Retry-After is documented only for 503
  6. Check the plan's terms before storing or reselling responses. Free accounts are limited to non-commercial use with a Powered by Tomorrow.io link

Questions

Which is better for AI agents, meteoblue Weather API or Tomorrow.io Weather API?

meteoblue Weather API scores 61.7 (C) on agent readiness against Tomorrow.io Weather API's 51.4 (D), and leads in 5 of 7 scored categories. Tomorrow.io Weather API leads on agent ergonomics.

Do meteoblue Weather API and Tomorrow.io Weather API need an API key?

meteoblue Weather API needs an API key. Tomorrow.io Weather API takes an API key or an OAuth sign-in.

Can an agent call meteoblue Weather API and Tomorrow.io Weather API without installing anything?

Yes. meteoblue Weather API has a hosted endpoint at https://my.meteoblue.com and Tomorrow.io Weather API at https://api.tomorrow.io/v4.

Other comparisons with meteoblue Weather API or Tomorrow.io Weather API

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