Best Weather APIs in 2026

The top 15 of 47 free Weather APIs, ranked by how easy they are to start with (API key, HTTPS, CORS), how reliable they are in our daily health checks, and what developers rate them. NASA POWER API takes the top spot.

Last tested Oct 24, 2026 · Rankings update daily

1
NASA POWER API
Online · 228 ms
Global solar and weather data for energy and agriculture.
- No API key needed
- Fast: 228 ms response
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
2
Veabird API
Online · 587 ms
Beach (sargassum, waves, hurricanes) and ski snow forecasts for 1,900+ resorts, no key.
- No API key needed
- Returns JSON at its URL
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
3
Open-Meteo API
Online · 522 ms
Global weather forecast API for non-commercial use.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
4
Open-Meteo Ensemble API
Online · 523 ms
Weather ensemble forecasts from multiple models.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
5
Pirate Weather API
Online · 419 ms
Free weather API with forecast data similar to Dark Sky.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
6
WeatherTotals API
Online · 491 ms
Measured US snow, rain, hail and aurora totals by state and city.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
7
wttr.in API
Online · 454 ms
Weather in your terminal, supports JSON output.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
8
Terrace Weather API
Online · 782 ms
Terrace open/closed verdict for restaurants, from the weather forecast.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
9
US Weather API
Online · 927 ms
US National Weather Service. A free weather API by weather.gov.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
10
FMI Open Data API
Online · 1444 ms
Finnish weather, sea, climate and radar observations via open WFS.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
11O
openSenseMap API
Online · 637 ms
Data from Personal Weather Stations called senseBoxes.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
12
World Time & Weather API
Online · 543 ms
Current weather, local time, UTC offset and DST rules for 400 cities as static JSON.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
13
RainViewer API
Online · 726 ms
Radar data collected from different websites across the Internet.
- No API key needed
- HTTPS
No authHTTPSCORS ?
14H
Hail History API
Online · 1890 ms
Radar-detected hail history for any US address from NOAA NEXRAD Level-III hail detections, by year.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
15I
IPMA API
Online · 788 ms
Portuguese weather and climate data.
- No API key needed
- HTTPS
No authHTTPSCORS ?

Weather APIs compared

Top Weather APIs compared
API	API key	HTTPS	CORS	Uptime	Response	Rating
NASA POWER	No	Yes	Yes	Up	228 ms	Not rated
Veabird	No	Yes	Yes	Up	587 ms	Not rated
Open-Meteo	No	Yes	Yes	Up	522 ms	Not rated
Open-Meteo Ensemble	No	Yes	Yes	Up	523 ms	Not rated
Pirate Weather	No	Yes	Yes	Up	419 ms	Not rated
WeatherTotals	No	Yes	Yes	Up	491 ms	Not rated
wttr.in	No	Yes	Yes	Up	454 ms	Not rated
Terrace Weather	No	Yes	Yes	Up	782 ms	Not rated
US Weather	No	Yes	Yes	Up	927 ms	Not rated
FMI Open Data	No	Yes	Yes	Up	1444 ms	Not rated

More Weather APIs

Best Weather API FAQ

What is the best free Weather API in 2026?

Based on access, reliability and developer ratings, the top free Weather APIs right now are NASA POWER API, Veabird API and Open-Meteo API. NASA POWER API ranks first. Rankings update daily from health checks of all 47 Weather APIs in the directory.

What is the best Weather API without an API key?

NASA POWER API, Veabird API and Open-Meteo API need no API key, so you can call them without signing up. 22 of the 47 ranked Weather APIs are keyless.

Which Weather API works from the browser?

NASA POWER API, Veabird API and Open-Meteo API support CORS over HTTPS, so front-end JavaScript can call them directly without a proxy.

How are these APIs ranked?

Each API gets a score from: no API key (+), HTTPS (+), CORS support (+), 30-day uptime and response time from our daily health checks, and ratings from developers on this site. APIs that failed three checks in a row are left out until they recover.