OpenMeteo GmbH operates an open-source weather API and provides free access for non-commercial use without requiring an API key. It supplies hourly forecasts, historical hourly datasets (over 80 years at 10 km resolution) and multiple specialised APIs (e.g. marine, air quality, flood), using local and global weather models and publishing code under AGPLv3 and data under CC BY 4.0.
Global weather forecasts and weather history via a JSON API, without an API key for non-commercial use; supports hourly, daily and current weather data.
Historical Weather Data API
ERA5 reanalysis since 1940, historical forecast archives, Previous-Runs API and Single-Runs API for climate baselines, backtesting, bias correction and ML training.
Weather Models API
Access to 30+ weather models worldwide, with best-match selection or direct model choice for comparisons and model-based workflows.
Ensemble-API
Probabilistic weather forecasts with ensemble members, percentiles and spread; suitable for uncertainty quantification and probability forecasts.
Climate API
CMIP6 climate projections up to 2050, downscaled to 10 km and bias-corrected against ERA5, for long-term climate risks and adaptation planning.
Marine-Weather-API
Ocean wave forecasts with wave height, period and direction for open sea and coastal areas.
Air-Quality-API
Hourly forecasts for air pollutants, UV index and pollen with global and European coverage.
Flood-API
Ensemble-based river discharge and flood forecasts worldwide up to 30 days ahead.
Geocoding-API
Place-name to coordinates geocoding with country, time zone and elevation; supports multilingual search queries and ranked results.
Elevation API
Terrain and elevation values in meters for WGS84 coordinates, also in batches with up to 100 point pairs per request.
Seasonal Forecast API
ECMWF SEAS5 and EC46 forecasts for weeks to months, probabilistically interpreted and intended for longer-term outlooks.
Commercial API Plans
Commercial usage license, dedicated API endpoint, API key, higher volumes, reserved servers and priority support in Standard, Professional and Enterprise plans.
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