Free APIGeo & WeatherNo keyOfficial
Open-Meteo
Free no-key weather, forecast, history, air quality, geocoding and elevation in one API
Open-Meteo is an open-source weather API offering forecasts, historical reanalysis, marine and air-quality data, plus geocoding and elevation lookups. It is free for non-commercial use with no API key or sign-up required. Data is returned as JSON, CSV or XLSX.
Free tier
Free for non-commercial use, no key (CC BY 4.0, attribution required). Under 10,000 calls/day. Commercial use needs a paid key.Rate limits
Free non-commercial tier: under 10,000 calls/day, 5,000/hour and 600/minute. No uptime guarantee.Auth
No keyBase URL
https://api.open-meteo.com/v1What you'd build with it
- Add a free weather widget or forecast tool to a Claude Skill with zero auth setup
- Enrich automation runs with current conditions or air quality for a coordinate
- Resolve user-typed city names to lat/lon for downstream geo steps
- Pull multi-year historical weather for analytics or backtesting
Key endpoints
- GET
/forecastHourly/daily weather forecast for lat/lon (up to 16 days) - GET
https://archive-api.open-meteo.com/v1/archiveHistorical weather reanalysis by date range - GET
https://air-quality-api.open-meteo.com/v1/air-qualityPM2.5, ozone, pollen and AQI forecasts - GET
https://geocoding-api.open-meteo.com/v1/searchResolve a place name to coordinates - GET
https://api.open-meteo.com/v1/elevationTerrain elevation for coordinates
Members
Members get the runnable recipe
Sign in free to copy the example request, see a sample response, and read the gotchas.
Tags
weatherforecastair-qualitygeocodingopen-source