Weather, especially for Astroweather
Weather and forecast data
Weather and forecast data from Spain
Real-Time & Historical World Weather Data API
Weather
Air Quality Index Data for over 1000 cities
NOAA aviation weather forecasts and observations
Meteorological data of the Basque Country
Provides weather forecast data for cities in Brazil
Provide weather information, earthquake information, and climate data
Weather and climate data
Real time weather forecasts and historic data
Weather and weather webcams
70+ years of global, hourly historical and forecast weather data from NOAA and ECMWF
Global weather forecast API for non-commercial use
Data from Personal Weather Stations called senseBoxes
Real-time UV Index Forecast
Location-based weather data
Radar data collected from different websites across the Internet
Global marine weather from multiple sources
Weather API Powered by Proprietary Technology
US National Weather Service
Global historical and weather forecast data
A RESTful free API to check the weather
Weather API with other stuff like Astronomy and Geolocation API
Assesses weather condition in specific locations