Free APIOpen DataNo keyOfficial

Aviation Weather Center API (aviationweather.gov)

Official US NWS aviation weather: METARs, TAFs, PIREPs, SIGMETs and AIRMETs in JSON/XML/GeoJSON, completely free and keyless.

The Aviation Weather Center is the US National Weather Service unit that publishes aviation weather. Its Data API offers machine-to-machine access to current and recent METAR observations, TAF forecasts, PIREPs, SIGMETs/AIRMETs, center weather advisories and station info, in JSON, XML, CSV or GeoJSON. No API key, no registration, modern HTTPS. Perfect for flight-planning skills and weather-aware aviation automations.

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Free tier

Free, public-domain US government data. No paid tiers.

Rate limits

Maximum 100 requests/minute (recommended <=1 req/min per thread); exceeding returns errors and may temporarily block. Most endpoints cap at ~400 entries per response. Set a descriptive User-Agent to avoid automated filtering.

Auth

No key

Base URL

https://aviationweather.gov/api/data

What you'd build with it

Pull live METAR/TAF for an airport inside a flight-planning skill
Automation that flags IFR/LIFR flight categories for selected airports
Hazard-advisory (SIGMET/AIRMET) monitoring for a route
Decode raw METAR strings into structured fields

Key endpoints

GET/metarCurrent/recent METAR observations by station ICAO id(s); format=json|xml|csv|geojson.
GET/tafTerminal Aerodrome Forecasts by station id(s) and format.
GET/pirepPilot reports (PIREPs) within a time window/area.
GET/airsigmetActive SIGMETs and AIRMETs hazard advisories.
GET/stationinfoStation metadata (location, elevation, name) by ICAO id.

Members

Members get the runnable recipe

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