Free APIs
Free Weather APIs
| Free tier | Docs | ||
|---|---|---|---|
Forecast, historical, marine and air-quality data from national weather models
Catch: Commercial use needs a paid plan; attribution required (CC BY 4.0) | Free for non-commercial use: up to 10,000 daily API calls, no key | No key | docs |
Global point forecasts from the Norwegian Meteorological Institute
Catch: Must send a unique User-Agent and cache responses or you get throttled | Free and open data; requires an identifying User-Agent header | No key | docs |
US forecasts, alerts and observations from the National Weather Service
Catch: US locations only; a User-Agent header is required | Free open data, no key | No key | docs |
Current weather, forecasts and geocoding
Catch: Free plan covers only current weather and basic forecasts | Free plan: 60 calls/minute and 1,000,000 calls/month | API key | docs |
Real-time, forecast, history, astronomy and search endpoints
Catch: Commercial use allowed; free plan limits history and forecast days | Free plan: 100,000 calls/month | API key | docs |
Historical and forecast weather in one timeline endpoint
Catch: Daily record cap; heavier use needs a paid plan | Free plan: 1,000 records/day | API key | docs |
Hyperlocal forecasts, minute-level nowcasts and weather alerts
Catch: Free plan has lower rate limits and limited history | Free plan available (key required) | API key | docs |
Dark Sky-compatible forecast API built on NOAA models
Catch: Donation raises the limit; signup required | Free tier: 10,000 calls/month | API key | docs |
Marine and surf weather: waves, tides, water temperature
Catch: Not for commercial use | Free plan: 10 requests/day | API key | docs |
| Free, no key | No key | docs | |
JSON API for German Weather Service (DWD) forecasts and observations
Catch: Mostly Germany and nearby; community-hosted | Free, no key (open DWD data) | No key | docs |
| Free API key, with rate limits | API key | docs | |
US air-quality index observations and forecasts from the EPA
Catch: US-focused; rate limits apply | Free API key | API key | docs |
METAR, TAF, PIREP and SIGMET data from NOAA
Catch: Rate limited; cache responses | Free, no key | No key | docs |
FAQ
What is the best free weather API?+
Open-Meteo, MET Norway Locationforecast, National Weather Service API are good places to start. Compare the free tiers and catches in the table; they differ mostly in limits and whether commercial use is allowed.
Is there a weather API without an API key?+
Yes: Open-Meteo, MET Norway Locationforecast, National Weather Service API, wttr.in, Bright Sky (DWD) work without a key.
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