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Weather Alerts APIs

Alert data mostly comes from national weather services, and most of it is free. The National Weather Service publishes active US watches and warnings as GeoJSON, Environment Canada's MSC GeoMet returns alerts as polygons, Bright Sky delivers German DWD warnings by municipality without a key, and Météo-France covers its vigilance alerts. For a single global feed, WeatherAPI, Weatherbit and Xweather include alerts with their keyed forecasts. Free Weather APIs →
9 listings
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APIPricingAuthFormatFree tierStatus
AccuWeatherCurrent conditions, forecasts, alerts and indices for locations worldwide from AccuWeather.
Weather & Environment › Weather Forecasts
FreemiumAPI keyJSON100–1k/dayLive
Bright SkyGerman DWD weather warnings by municipality, rain radar, hourly observations and forecasts as JSON, no key.
Weather & Environment › Natural Disasters
FreeNoneJSONUnlimitedLive
Hong Kong Observatory Open DataReal-time Hong Kong weather, warnings, forecasts, climate records and worldwide M6+ earthquake data.
Weather & Environment › Weather Forecasts
FreeNoneJSONUnlimitedLive
Météo-France API PortalOfficial French weather forecasts, radar, climate and vigilance-alert data from 22 Météo-France APIs.
Weather & Environment › Weather Forecasts
FreeOAuthJSON10k+/dayLive
MSC GeoMet OGC API (Environment Canada)Canadian weather alerts as GeoJSON polygons, plus marine forecasts, river levels and climate records.
Weather & Environment › Natural Disasters
FreeNoneJSONUnlimitedLive
National Weather ServiceOfficial US forecasts on a 2.5 km grid, active watches and warnings, and station observations, as GeoJSON.
Weather & Environment › Weather Forecasts
FreeNoneJSONUnlimitedLive
WeatherAPICurrent weather, 14-day forecasts, history from 2010, alerts, marine, astronomy and IP lookup.
Weather & Environment › Weather Forecasts
FreemiumAPI keyJSON1k–10k/dayLive
WeatherbitCurrent conditions, 16-day and hourly forecasts, air quality, lightning, alerts and ag/energy degree-day data.
Weather & Environment › Weather Forecasts
FreemiumAPI keyJSON<100/dayLive
Xweather Weather API (formerly AerisWeather)Observations, forecasts, alerts, lightning, hail and air quality by place name or coordinate, plus map tiles.
Weather & Environment › Weather Forecasts
FreemiumAPI keyJSON100–1k/dayLive

Choosing a Weather Alerts API

Is there a free Weather Alerts API?

Yes. National Weather Service, Bright Sky, Hong Kong Observatory Open Data, Météo-France API Portal and MSC GeoMet OGC API (Environment Canada) are free to use, and WeatherAPI, AccuWeather, Weatherbit and Xweather Weather API (formerly AerisWeather) have a free tier alongside paid plans. See all free Weather APIs.

Which Weather Alerts APIs work without an API key?

National Weather Service, Bright Sky, Hong Kong Observatory Open Data and MSC GeoMet OGC API (Environment Canada) need no key or sign-up, so you can try them with a plain request.

Can I call a Weather Alerts API from front-end JavaScript?

National Weather Service, Bright Sky, Hong Kong Observatory Open Data and MSC GeoMet OGC API (Environment Canada) allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.

Can I use Weather Alerts APIs in a commercial project?

National Weather Service, WeatherAPI, Bright Sky and MSC GeoMet OGC API (Environment Canada) permit commercial use. Hong Kong Observatory Open Data and Weatherbit restrict it, for example to non-commercial or attributed use, so read the terms first.

Which Weather Alerts APIs work with AI agents?

National Weather Service, WeatherAPI, Bright Sky, Météo-France API Portal, MSC GeoMet OGC API (Environment Canada) and 1 other publish an OpenAPI spec for generating clients and tools.

Broader: Weather Forecasts APIs · Weather & Environment APIs

More in Weather Forecasts: Historical Weather APIs · Marine Weather APIs · Weather Radar APIs