Weather and climate
Open forecasts, radar, climate history and air quality from weather services and science agencies. 10 resources; API, key, license and embedding quoted from each site's own pages, checked Oct 23, 2026.
Open-Meteo
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
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
NASA POWER (Prediction Of Worldwide Energy Resources)
One key-less GET request returns decades of sunshine and temperature for any coordinate, which is exactly the input a solar-panel or crop model needs.
LiveAPI, no keyDownloadCommercial OK
RainViewer Weather Maps API
You can animate live rain moving across most of the world on your own map with one JSON call and a tile URL template, no key needed.
LiveAPI, no keyCommercial: conditions
OpenAQ
It puts readings from many countries' monitoring networks into one schema, so you can compare the air in two cities with the same query.
LiveAPIDownloadCommercial: conditions
Side by side
| Resource | API | Key | Data download | Commercial use | Embed |
|---|---|---|---|---|---|
| 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. |
Official API · Free tier | No | Yes (json, csv) | Commercial use with conditions | Embedding with conditions |
| 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. |
Official API · Free | No | Yes (netcdf) | Commercial use OK | Embedding with conditions |
| National Weather Service API (api.weather.gov) The official US weather service API: forecasts for any US grid point, hourly forecasts, station observations and active watches and warnings, served as GeoJSON and other formats. |
Official API · Free | No | — | Commercial use OK | Embedding with conditions |
| NOAA NCEI Climate Data Online and Access Data Service NOAA's archive of historical weather and climate observations, including daily station records (GHCN-Daily) from over 90,000 land stations, with a key-less data service API, a token-based CDO API and bulk file downloads. |
Official API · Free | No | Yes (csv, text) | Commercial use with conditions | Can be embedded |
| ECMWF Open Data A free subset of ECMWF's real-time global forecasts from its physics model (IFS) and its machine-learning model (AIFS), published as GRIB2 files four times a day on a download portal and mirrored on AWS, Azure and Google Cloud. |
Official API · Free | No | Yes (grib2) | Commercial use OK | Embedding with conditions |
| Copernicus Climate Data Store (CDS) The EU's climate data catalogue: reanalyses such as ERA5 (hourly global weather back to 1940), satellite records, seasonal forecasts and climate projections, downloadable through web forms or the cdsapi Python client with a free account. |
Official API · Free | Yes | Yes (grib, netcdf) | Commercial use OK | Embedding with conditions |
| DWD Open Data Server Germany's national weather service file server: ICON model forecasts (GRIB2), radar composites, live station observations, severe-weather warnings (CAP) and long climate station records from its Climate Data Center, all as plain HTTPS downloads. |
No official API | — | Yes (grib2, csv, text, xml, zip) | Commercial use OK | Embedding with conditions |
| NASA POWER (Prediction Of Worldwide Energy Resources) A NASA API and data viewer giving satellite- and model-derived solar radiation and weather for any point on Earth, with 300+ parameters at hourly, daily, monthly and climatology levels, in units tailored for renewable energy, buildings and agriculture. |
Official API · Free | No | Yes (csv, netcdf, json) | Commercial use OK | Embedding with conditions |
| RainViewer Weather Maps API A free public JSON index plus PNG map tiles of a global weather-radar composite built from 1200+ radars, covering the past 2 hours with nowcast frames, ready to drop on a Leaflet or MapLibre map. |
Official API · Free | No | — | Commercial use with conditions | Embedding with conditions |
| OpenAQ An open platform that collects air-quality measurements (PM2.5, PM10, ozone, NO2 and more) from government monitors and low-cost sensors worldwide and serves them through a free keyed REST API and a key-less daily CSV archive on AWS S3. |
Official API · Free tier | Yes | Yes (csv.gz) | Commercial use with conditions | Embedding with conditions |