WeatherMetro
Access free commercial weather data with the WeatherMetro API
WeatherMetro is a weather data API that provides 16-day hourly forecasts, minute-level rain nowcasts, and air quality data for over five million places worldwide. It ingests model runs directly from national weather agencies such as ECMWF, NOAA, DWD, and Météo-France, processing them through its own pipeline rather than reselling third-party data. The same pipeline also powers free public weather pages for cities globally, so the data served through the API matches what appears on those pages.
The API covers forecast, current conditions, nowcast, air quality, history, and alerts endpoints, with built-in location search and autocomplete. It includes pollen and UV data alongside PM2.5 and ozone readings, radar-driven nowcasts across the US and Europe, and historical weather data back to 1940. Responses are delivered in a consistent JSON format, and each datapoint identifies the model behind it. An iPhone app is also available, offering live radar, air quality, UV, and climate context.
WeatherMetro is aimed at developers building weather-dependent products and services. It offers a permanent free plan with 100,000 API calls per month for commercial use, requiring visible attribution. Paid plans are subscription-based and billed monthly, with tiers for higher call volumes, severe-weather alerts, historical data, bulk exports, and enterprise needs such as dedicated capacity and uptime commitments.
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