Open-Meteo

Open-source weather API delivering high-resolution forecast data without API keys for non-commercial use.

Open-Meteo streamlines meteorological data access by aggregating global models like ECMWF IFS, NOAA GFS, and DWD ICON into a single, high-performance JSON interface. It eliminates the friction of traditional weather services by offering free access for up to 10,000 daily requests and requiring no registration for personal projects. The platform serves precise hourly data (including temperature, wind speed, and solar radiation) across a 0.1-degree spatial grid. Developers benefit from specialized endpoints for historical reanalysis dating back to 1940 and localized air quality metrics (PM2.5 and NO2) derived from CAMS datasets.

https://open-meteo.com