Free Weather APIs

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AviationWeather.gov is a free NOAA service that provides official aviation weather data including METARs, TAFs, PIREPs, and SIGMETs used by pilots and flight planners.

The Hong Kong Observatory Open Data API provides free access to weather observations, forecasts, earthquake reports, and climate data for Hong Kong and the surrounding region.

MetaWeather provides programmatic access to weather via REST API.

ODWeather is a free weather and webcam API from OceanDrivers that provides real-time marine and coastal weather data including wind, waves, and temperature.

Open-Meteo is a completely free and open-source weather API for non-commercial use that provides hourly and daily forecasts, historical data, and climate projections for any location worldwide without requiring an API key.

openSenseMap is an open-source platform that aggregates real-time sensor data from community-operated personal weather stations called senseBoxes, spread across the globe.

RainViewer provides radar imagery and rain map tile data collected from weather radar stations around the world, with no API key required.

The US Weather API is the official National Weather Service (NWS) REST API provided by the US government, offering free and unlimited access to forecasts, alerts, and observation data for the United States.

weather-api is a lightweight, open-source RESTful API that provides current weather data for cities around the world with no authentication required.