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.
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