Weather and climate · by Open-Meteo

Open-Meteo

A JSON weather API that serves forecasts from 30+ national weather models plus hourly historical weather back to 1940, with sister APIs for air quality, marine, flood, elevation and geocoding.

You can pull a forecast or 80 years of hourly history for any coordinate with one plain URL and no sign-up, and the whole server is open source so you can run your own copy.

LiveAPI, no keyDownloadCommercial: conditions

Open open-meteo.com ↗ agent.md

For your project

Official API: Official API · Free tier Free API: non-commercial only, less than 10,000 calls per day, 5,000 per hour and 600 per minute (300,000 per month); paid plans (Standard 1M, Professional 5M, Enterprise >50M calls/month) add a commercial licence and an API key
“Free weather forecast and historical weather API — 30+ models, historical weather from 1940, no API key required.” open-meteo.com/
Key: Not needed
“Free API No API key, no sign-up, no credit card. Non-commercial use up to 10,000 daily API calls is free.” open-meteo.com/
Formats: JSON, CSV, XLSX, FLATBUFFERS
Data download: Yes json, csv
“You can self-host your own instance for unlimited API calls — useful for high-volume ML workloads or air-gapped environments.” open-meteo.com/
License: CC BY 4.0 (API data); AGPLv3 (source code); site terms for the free API service Data is CC BY 4.0; the free hosted API may only be used non-commercially, commercial apps need a paid plan (customer-api.open-meteo.com) or a self-hosted server
Commercial use: Commercial use with conditions
“All data served by the API is licenced under CC BY 4.0 — free to use and redistribute, including for commercial purposes, with attribution.” open-meteo.com/
Credit: Credit required
“You must include a link next to any location Open-Meteo data are displayed, for example: < a href = " https://open-meteo.com/ " > Weather data by Open-Meteo.com </ a >” open-meteo.com/en/licence
Embedding: Embedding with conditions
“You must include a link next to any location Open-Meteo data are displayed” open-meteo.com/en/licence
Using the website: Free

Read on Open-Meteo'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.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&hourly=temperature_2m

No key on api.open-meteo.com: pass latitude, longitude and a comma list of variables (hourly=, daily=); use archive-api.open-meteo.com/v1/archive for history; batch several coordinates in one call (comma-separated lat/lon) to save quota.
Free api.open-meteo.com is non-commercial only (no ads or subscriptions); commercial apps need a paid plan or self-hosting.
Show a link 'Weather data by Open-Meteo.com' next to every place the data is displayed (CC BY 4.0).
Stay under 600 calls/min, 5,000/hour and 10,000/day per IP on the free API.

Paste into your agent: Read https://agentgid.com/resources/open-meteo/agent.md before using Open-Meteo.

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 personal or non-profit 'should I cycle today' page that reads hourly rain, wind and temperature for the user's GPS position (free API, link to Open-Meteo shown).
A climate-normals widget for a hobby gardening site: compare this month's temperature and rainfall with the 1940-to-now archive for the same location.
A self-hosted Open-Meteo instance behind a commercial solar-yield or HVAC planning app, avoiding the free API's non-commercial limit while keeping the CC BY credit line.

More in Weather and climate

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MET Norway Weather API 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 National Weather Service API (api.weather.gov) The same warnings and grid forecasts that US forecasters issue are available to any program for free, and the content is public domain. LiveAPI, no keyCommercial OK NOAA NCEI Climate Data Online and Access Data Service You can pull more than a century of daily highs, lows and rainfall for a single weather station with one URL and see how a place's climate has shifted. LiveAPI, no keyDownloadCommercial: conditions ECMWF Open Data It hands out raw global output from one of the world's leading forecast centres, including its AI forecast model, under a licence that allows commercial reuse. LiveAPI, no keyDownloadCommercial OK Copernicus Climate Data Store (CDS) ERA5 lets you reconstruct the weather for any hour at any spot on Earth since 1940 on a 0.25° grid, which is the backbone of much modern climate research. LiveAPIDownloadCommercial OK DWD Open Data Server A whole national weather service's raw output, from global model runs to decades of daily station records, sits in open folders you can browse and script against without signing up. LiveDownloadCommercial OK

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