Weather & Environment

Pay-per-action API to plant trees, capture carbon, or clean oceans, with GPS-verified impact tracking.

GFS-based multi-day forecasts by coordinate, including sky seeing and transparency for stargazing.

Current conditions, forecasts, alerts and indices for locations worldwide from AccuWeather.

Official Spanish weather forecasts, observations, and climate data, key required.

Hourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate.

Discontinued weather API; apixu.com now server-redirects permanently to Weatherstack.

Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations.

Sun, Moon and planet positions and events for any place and date, plus rendered star charts and moon images.

NOAA aviation weather: live METARs, TAFs, PIREPs, and SIGMETs for airports worldwide.

Estimates CO2 emissions from electricity, flights, vehicles, shipping and fuel via REST.

Global weather forecasts with minute-by-minute nowcasting and air-quality data by coordinates.

ERA5 reanalysis back to 1940, seasonal forecasts and climate projections as gridded files via queued jobs.

Computed sun, moon, planet, and eclipse data for any location and date, no key needed.

Retired minute-by-minute forecast service bought by Apple; its successor is the WeatherKit REST API.

Swedish electricity spot prices by zone in 15-minute intervals, with VAT and energy tax included.

Danish electricity, gas, and CO2-emissions data from grid operator Energinet, updated every few minutes.

US EPA Air Quality System: ambient air monitor readings by site, county, or state.

Basque Country weather forecasts, station readings, ocean and tide data from the regional met agency.

Global point weather forecasts plus air quality, pollen, marine and ski-resort conditions.

Cloud platform for analyzing petabytes of satellite imagery and other geospatial/environmental datasets.

Forecast, satellite/radar and historical weather data by coordinate, queried against GFS, HRRR and NBM models.

Live and historical wholesale electricity prices, demand, and carbon intensity across 25 grid zones.

Scores backyard grilling conditions 0-100 from live weather, with best-window and weekly forecasts.

Looks up NOAA NEXRAD-detected hail history for a US address or coordinate, by year and day.

Current conditions and 15-day forecasts for Brazilian cities, plus up to 3 years of history.

Real-time Hong Kong weather, warnings, forecasts, climate records and worldwide M6+ earthquake data.

Portuguese government weather forecasts, sea state, UV index, fire risk, and seismic data, no key needed.

Current US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings

Near real-time wildfire clusters worldwide from satellite feeds and verified citizen reports.

Lists and downloads KNMI's raw weather observation, radar and climate datasets by dataset name and version.

Official South Korean weather observations, forecasts and climate records back to 1904.

Real-time and forecast air quality measurements from Dutch government monitoring stations.

Nine-day point forecasts for any latitude/longitude with weather symbol codes and UV, richest for the Nordics

UK Met Office's original forecast/observation API for weather stations and sites; now decommissioned.

Official French weather forecasts, radar, climate and vigilance-alert data from 22 Météo-France APIs.

Swiss forecast, historical and dataset weather API with credit-metered packages for many variables.

Norway's national weather service: global forecasts plus Nordic marine, aviation and nowcast data.

Global current, hourly and 30-day forecasts blending weather models with AI, plus air quality data.

Moon phase, illumination, moon sign, and moonrise/moonset data for 1900–2100.

Satellite active-fire hotspots from MODIS, VIIRS and Landsat by bounding box and date, near real-time.

Provides NASA satellite-derived solar radiation, temperature, and weather-model data by coordinate and date.

Official US forecasts on a 2.5 km grid, active watches and warnings, and station observations, as GeoJSON.

Historical station observations and daily-to-yearly climate summaries from NOAA's archive, by station or area.

Global hourly historical (from 1940) and forecast weather data by location, billed per data unit.

Hourly and daily forecasts up to 16 days built from national weather-service models, callable without a key.

Per-member probabilistic forecasts (18-51 ensemble runs) from ICON, GFS, ECMWF and other models.

Aggregated PM2.5, NO2, O3 and other pollutant readings from ground monitoring stations worldwide.

Live readings from crowdsourced senseBox weather/air-quality stations worldwide.

Real-time and hourly UV index forecasts by latitude/longitude, with altitude and ozone adjustments.

Current conditions, 5-day forecasts, air pollution and map layers for any coordinates, plus geocoding.

Live and historical PM2.5, temperature and humidity from community sensors, by sensor or bounding box.

Solar radiation and photovoltaic system output estimates for any location, from the EU's PVGIS model.

Global real-time weather, forecasts, air quality, and severe alerts at 1km resolution.

Minute-by-minute precipitation nowcasting, cloud/precip map tiles, and hourly/daily forecasts.

Animated precipitation radar map tiles and forecast overlays from 1,200+ radar stations worldwide.

Swedish calculators for lighting lumens, appliance electricity cost, and barcode country prefixes.

Estimates solar panel production, ROI and cost for Italian roofs using satellite and irradiance data.

Marine and weather forecasts (waves, tides, wind, temperature) blended from multiple national models.

Hourly Norwegian electricity spot prices per zone, including VAT and government support amounts.

Sunrise, sunset, twilight, golden hour, sun position and moon phase for any coordinates, a year per call.

Calculates sunrise, sunset, twilight windows, and solar noon for any latitude/longitude and date.

18,000+ GHG emission factors from DEFRA, EPA, ADEME and Ember for Scope 1-3 carbon footprint calculations.

Realtime conditions plus hourly (120h) and 5-day forecasts from proprietary models, with 60+ data layers.

Half-hourly forecast and actual carbon intensity of Great Britain's electricity grid, national and regional.

US government forecasts, alerts and observations by grid point, in GeoJSON with multiple format options.

Searchable global earthquake catalog by time, area, depth and magnitude, plus minute-updated GeoJSON feeds.

Real-time and historical global earthquake catalog: magnitude, depth, time, location by query.

Historical weather back 50+ years and 15-day forecasts for any address or coordinate in one timeline query.

Electricity usage, utility, carbon footprint, and solar estimates for a US/Canada address.

Current weather, 14-day forecasts, history from 2010, alerts, marine, astronomy and IP lookup.

Current conditions, 16-day and hourly forecasts, air quality, lightning, alerts and ag/energy degree-day data.

Real-time weather lookup by city or coordinates, plus historical, forecast, and astronomy data on paid plans.

US snow, rain and hail totals plus current aurora visibility, sourced from NOAA and NWS observations.

Estimates a webpage's CO2 emissions and carbon rating from its transfer size and hosting type.

Current local time, timezone/DST info, and weather for 400 cities as static JSON, updated every 30 min.

Current conditions and 3-day forecast by city, airport code or coordinates as text, PNG or JSON.

Global current conditions, hourly/10-day forecasts and history via Yandex's Meteum GraphQL API.