Weather and climate · by Norwegian Meteorological Institute (MET Norway)

MET Norway Weather API

The free forecast API behind Yr: give it a latitude and longitude anywhere in the world and get a point forecast (temperature, wind, rain, cloud, UV, weather symbol) as JSON or legacy XML.

It is a national weather service's own production API, open to anyone worldwide without a key and licensed for commercial use, as long as your app identifies itself and caches politely.

LiveAPI, no keyDownloadCommercial OK

Open api.met.no ↗ agent.md

For your project

Official API: Official API · Free Identifying User-Agent required (missing or generic ones get 403); over 20 requests/second per application in total needs a special agreement; max 4 decimals in coordinates; respect Expires and use If-Modified-Since
“API is an interface to a selection of data produced by MET Norway. The data are freely available for use under a Creative Commons license , including commercial use.” api.met.no/
Key: Not needed
“All requests must (if possible) include an identifying User Agent-string (UA) in the request with the application/domain name, optionally version number.” api.met.no/doc/TermsOfService
Formats: JSON, XML
Data download: Yes netcdf
“While we only serve current forecasts via the API, you can find historical forecast model data in NetCDF format on https://thredds.met.no/thredds/metno.html .” api.met.no/weatherapi/locationforecast/2.0/documentation
License: NLOD 2.0 and CC BY 4.0 All data and products on api.met.no unless specified otherwise; use of the service is also bound by the Terms of Service (identification, caching, traffic limits, no 'Yr' branding)
Commercial use: Commercial use OK
“The data are freely available for use under a Creative Commons license , including commercial use.” api.met.no/
Credit: Credit required
“Credit should be given to The Norwegian Meteorological Institute, shortened MET Norway , as the source of data.” api.met.no/doc/License
Embedding: Embedding with conditions
“Browsers and mobile apps should not contact the API directly, but instead use a local proxy (backend for frontend) server where you can cache data and add identification/authentication details” api.met.no/doc/TermsOfService
Using the website: Free

Read on MET Norway Weather API's own pages on Oct 23, 2026 · license or terms · API docs. Check the license page before you ship.

For your agent

A request your code or agent can make with no key:

https://api.met.no/weatherapi/locationforecast/2.0/compact?lat=59.91&lon=10.75

Send a unique User-Agent (app name + site URL), round lat/lon to 4 decimals, use /compact for the common fields, and re-request only after the Expires header (send If-Modified-Since).
Always send an identifying User-Agent (e.g. 'AgentGidBot/1.0 (+https://agentgid.com/about/)'); generic ones like okhttp or Java are blocked with 403.
Credit 'MET Norway' as the data source (CC BY 4.0 / NLOD); do not use the name or logo of Yr.
Cache responses, honour Expires/If-Modified-Since, round coordinates to 4 decimals, and stay under 20 requests/second in total; browsers and mobile apps should go through your own proxy.

Paste into your agent: Read https://agentgid.com/resources/met-norway-locationforecast/agent.md before using MET Norway Weather API.

What you can build

Rain in the next hour: an alert for your cityA bot or widget that warns when rain is coming soon, from free weather-service forecasts and radar.

A backend-cached forecast endpoint for a commercial outdoor-activity app (hiking, sailing) that fetches /compact once per location until Expires and serves many users from cache.
A smart-home rule engine that closes awnings or delays irrigation when the next hours show wind or precipitation above a threshold.
A static travel-site widget rebuilt hourly by a cron job, showing the 3-day forecast for each destination with a 'Data from MET Norway' credit.

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