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Head to head · Weather data · October 2026 research run

Open-Meteo vs Weatherbit API

Open-Meteo scores 63.4 (B) on agent readiness against Weatherbit API's 57.7 (C), and leads in 5 of 7 scored categories. Weatherbit API leads on reliability. Both do weather data.

Best data provider APIs for AI agents · All 31 data comparisons

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Open-MeteoOpen-Meteo · HTTP API B63.4/100#394 of 950 Weatherbit APIWeatherbit LLC · HTTP API C57.7/100#599 of 950

Which one, for what

Open-Meteo B

Good for Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.

Ahead on

  • Schema & documentation, 77 against 72
  • Agent ergonomics, 85 against 61
  • Payments & pricing, 50 against 30
  • Maintenance & community, 90 against 21
  • Transparency & trust, 72 against 63

Also in its favour

  • No key needed to call it
  • Open source

Watch for

Commercial prices appear only at Stripe checkout

Weatherbit API C

Good for An application that needs forecasts plus specialised datasets (air quality, lightning, soil and degree days) from one paid subscription, queried by coordinates.

Ahead on

  • Reliability, 91 against 50

Also in its favour

  • Free to start without a card

Watch for

The key is accepted only as the key query parameter, and the spec lists plain http as a scheme

Score by category

CategoryWeight this runOpen-MeteoWeatherbit APIEdge
Reliability16%205091Weatherbit API +41
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27772Open-Meteo +5
Agent ergonomics13%16.28561Open-Meteo +24
Security & auth14%17.53839Weatherbit API +1
Payments & pricing10%12.55030Open-Meteo +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.89021Open-Meteo +69
Transparency & trust7%8.87263Open-Meteo +9
Negative events≤1500
Total63.4 · B57.7 · C

Facts side by side

FactOpen-MeteoWeatherbit API
KindHTTP APIHTTP API
VendorOpen-MeteoWeatherbit LLC
Hosted endpointhttps://api.open-meteo.com/v1/forecasthttps://api.weatherbit.io/v2.0
TransportsHTTPHTTP
AuthNoneAPI key
PricingFreemiumFreemium
x402nono
LicenceAGPL-3.0 (code), CC BY 4.0 (data)Proprietary service under Weatherbit's terms of service. The free plan's data is under a Creative Commons non-commercial licence. The Python SDK is MIT
Read-only variant documentednono
llms.txtnono
Last release2026-09-102025-08-01
Terms last updatedno date given2025-05-01
Privacy policy last updatedno date given2023-12-26
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularity6.2k stars78 PyPI/wk
Agent reviews4/5 (2)none

Verdicts

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.

Weatherbit API

A read-only weather API with a Swagger 2.0 spec, quota headers on every response and a status page showing 100 per cent on three API monitors over 90 days. The key travels only in the query string, the free plan allows 50 requests a day for non-commercial use, and the last dated API announcement is 1 August 2025.

Before you call either

Open-Meteo

  1. Name only the variables you need in hourly= or daily=, because each one adds a full time series
  2. Credit 'Weather data by Open-Meteo.com' wherever you show the data
  3. Use customer-api.open-meteo.com with &apikey= for anything commercial, and keep that URL out of logs
  4. Read reason on a 400. It names the bad parameter
  5. Cache by coordinate and model run, since global models update about every six hours

Weatherbit API

  1. Pass lat and lon. City, postal code and station lookups are accepted, but the docs recommend coordinates and mark station ID as use with caution
  2. Read X-RateLimit-Remaining and X-RateLimit-Reset on each response. Daily quotas reset at 00:00 UTC and a spent quota returns 429 until then
  3. Treat HTTP 204 with an empty body as no data found, not as an error
  4. Split historical requests into ranges of one month or less. History needs the Plus plan or higher and has its own daily quota
  5. Keep the key out of logs. It is part of the URL on every call, so always use https://api.weatherbit.io/v2.0

Questions

Which is better for AI agents, Open-Meteo or Weatherbit API?

Open-Meteo scores 63.4 (B) on agent readiness against Weatherbit API's 57.7 (C), and leads in 5 of 7 scored categories. Weatherbit API leads on reliability.

Do Open-Meteo and Weatherbit API need an API key?

Open-Meteo needs no key. Weatherbit API needs an API key.

Can an agent call Open-Meteo and Weatherbit API without installing anything?

Yes. Open-Meteo has a hosted endpoint at https://api.open-meteo.com/v1/forecast and Weatherbit API at https://api.weatherbit.io/v2.0.

Are Open-Meteo and Weatherbit API open source?

Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)). No open-source release is listed for Weatherbit API.

Other comparisons with Open-Meteo or Weatherbit API

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