Best Free Weather APIs for Developers

Zero registration required, 16-day forecasts, free for non-commercial applications

7-day weather forecast, current conditions, and historical records

Comprehensive real-time weather and astronomical datasets

50-year historical weather records and global meteorological forecasts

Advanced hyperlocal weather intelligence, wind vectors, and alert feeds

Open meteorological historical weather data archive and climate trends

Enterprise-grade weather forecasts and high-resolution radar feeds

High-resolution historical and current weather and solar telemetry

Real-time global weather and geolocation lookup engine

Global historical and forecast weather API offering premium meteorological conditions and forecasts.

Official US National Weather Service open API, requires User-Agent header

Norwegian Meteorological Institute open public weather feeds with User-Agent policy

Global real-time air quality index (AQI) and pollution sensor datasets

Global community air quality open environmental data platform

The 7Timer Weather API provides global numerical weather forecasts derived from high-resolution models. Users can access weather data in graphical or machine-readable formats without needing an API key, enabling programmatic access to various meteorological elements.

Public API for Aare river data including temperature, flow rate, weather forecasts, and more. Non-commercial use allowed with customizable app and version parameters.

Provides access to data from around 160 automatic measurement stations within the SwissMetNet network. It delivers vital meteorological data including temperature, precipitation, wind speed, and humidity every 10 minutes to support weather forecasting and environmental monitoring.

This API provides machine-to-machine access to aviation weather data, including METARs, TAFs, AIRMETs, and SIGMETs. It enables users to fetch up-to-date weather information for flight planning and operations.

Provides real-time UV Index and 5 day Hourly UV Index Forecast globally without API Key. Single endpoint for current UV Index and forecast based on latitude/longitude.

This API provides current weather data for a specified location, presenting information visually through Glax. Users can retrieve data in JSON or PNG formats and customize their queries with parameters like location, units, and forecast options.

The Meteoprog Weather API provides comprehensive weather data, allowing integration of fast and accurate weather forecasts into various applications and websites. It offers endpoints for current weather, forecasts, historical data, and more, ensuring easy access to vital meteorological information.

This API provides real-time readings of temperature, humidity, precipitation, and wind conditions across various weather stations in Singapore at intervals of up to one minute. Managed by the National Environment Agency (NEA), it allows users to access detailed weather data for public use.

The UV Index API provides real-time and 5-day forecast data for UV index levels based on geographic coordinates. It's free to use with no API key required, making it accessible for developers to integrate into their applications.

This API provides weather data, including current conditions, forecasts, and historical weather information. It allows users to access weather information for various locations worldwide.