Best Free Weather APIs (June 2026)

Ranked by uptime + speed + free-tier quality. Updated every hour.

Looking for a free weather API that works today? The list below is ranked by our composite score — weighted 60% uptime, 30% response speed, and 10% free-tier accessibility, recalculated every hour from live checks. See our methodology for how the score is computed.

Quick answer:

We track 15 free weather APIs with live hourly checks. The current top pick is NOAA National Weather Service (100% 30-day uptime) — and it needs no API key. 6 of the 15 require no API key at all, and 5 hold 99%+ uptime.

#1 NOAA National Weather Service — 🟢 Online
Official US government weather API providing forecasts, alerts, and observations for US locations. No key required.

Unlimited (US only), no key, no credit card
#2 7Timer! — 🟢 Online
Free, no-key weather forecast API focused on astronomical and civil forecasts using NOAA GFS model data.

Unlimited, no key, no credit card
#3 Open-Meteo Air Quality — 🟢 Online
Free air quality forecast API providing PM2.5, PM10, ozone, and other pollutant data worldwide. No key required.

10,000 calls/day, no key, no credit card
#4 Bright Sky (DWD) — 🟢 Online
Open weather API built on German Weather Service (DWD) data covering all of Germany with no key required.

Unlimited, no key, no credit card
#5 MET Norway Locationforecast — 🟢 Online
Free weather forecast API from the Norwegian Meteorological Institute covering global locations. No key required.

Unlimited, no key, must set User-Agent header
#6 Weatherstack — 🟢 Online
Real-time and historical weather data API powered by worldwide weather stations with JSON and XML output.

100 calls/month, free key, no credit card
#7 Open-Meteo — 🟢 Online
Free weather forecast API with no key required. 10,000 calls/day for non-commercial use.

10,000 calls/day, no key, no credit card
#8 Tomorrow.io — 🔴 Offline
AI-powered weather API with hyperlocal forecasts, severe weather alerts, and climate intelligence for 25 locations free.

25 locations, 500 calls/day, free key, no CC
#9 OpenWeatherMap — 🔴 Offline
One of the most popular weather APIs with current, forecast, and historical data for any location worldwide.

1,000 calls/day, free key, no credit card
#10 WeatherAPI.com — 🔴 Offline
Comprehensive weather API offering current, forecast, historical, marine, and astronomy data with a generous free tier.

1,000,000 calls/month, free key, no credit card
#11 OpenUV — 🔴 Offline
Real-time and forecast UV index API covering global locations using NASA satellite data. Free tier available.

100 calls/day, free key, no credit card
#12 MeteoSource — 🔴 Offline
High-resolution weather forecast API with hourly and daily data, machine-learning corrected models for 150,000+ locations.

400 calls/day, free key, no credit card
#13 Weatherbit — 🔴 Offline
Global weather API offering current conditions, 16-day forecasts, hourly data, and severe weather alerts for 150+ countries.

500 calls/day, free key, no credit card
#14 AccuWeather API — 🔴 Offline
Industry-leading weather API with hyperlocal MinuteCast, severe weather alerts, and 45-day forecasts.

50 calls/day, free key, no credit card
#15 Visual Crossing Weather — 🔴 Offline
Historical and forecast weather data API with CSV and JSON output, supporting 40+ years of history and 15-day forecasts.

1,000 records/day, free key, no credit card

Compare Weather APIs

Side-by-side comparisons of the top Weather APIs — free tier, uptime, and response time:

Frequently Asked Questions

What is the best free weather API in 2026?

Open-Meteo is currently the most generous: no API key required, 10,000 calls/day for non-commercial use, and reliable global coverage. WeatherAPI.com and OpenWeatherMap also have solid free tiers but require a free account.

Do free weather APIs require a credit card?

Most don't. Open-Meteo and Bright Sky require no payment information. OpenWeatherMap and WeatherAPI.com require an email but no card. AccuWeather's free tier is the strictest and limits you to 50 calls/day.

Which free weather APIs are production-reliable?

We measure uptime hourly. Currently the most reliable in our tracking are Open-Meteo, MET Norway, and NOAA Weather (US-only). Check the live ranking on this page — it updates every hour.

Can I use free weather data commercially?

It depends on the provider. Open-Meteo is free for non-commercial use only. WeatherAPI.com permits commercial use on its free tier with attribution. Always check the API's terms of service before deploying to production.

How accurate are free weather forecasts?

Free APIs typically use the same underlying weather models (GFS, ECMWF) as paid services, so short-term accuracy is comparable. Paid tiers usually unlock historical data, more frequent updates, and minute-level forecasts.