← All Rankings · View this collection →
Free Weather APIs — Reliability Rankings
Ranked by real uptime and response time, measured hourly by our own monitor.
3 of 5 APIs in Free Weather APIs have at least a week of measured data so far — the rest are new to monitoring and will appear as their first week completes. 3 maintained 99.9%+ uptime over the last 7 days, led by Amazon Forecast Query Service at 100%.
| # | API | 7-day uptime | Avg response | Latest check |
|---|---|---|---|---|
| 1 | Amazon Forecast Query Service amazonaws |
100% | 105 ms | Up · checked under an hour ago |
| 2 | Amazon Forecast Service amazonaws |
100% | 135 ms | Up · checked under an hour ago |
| 3 | APOD nasa |
100% | 261 ms | Up · checked under an hour ago |
| 4 | OpenWeatherMap API api.openweathermap.org |
— | — | Monitoring in progress |
| 5 | NOAA National Weather Service API weather.gov |
— | — | Monitoring in progress |
How this is measured
Every API in our catalog is checked hourly by an HTTP HEAD request to its base endpoint from our own monitor — not pulled from a provider's status page or marketing claims. "Uptime %" is the share of checks in the trailing 7 days that returned a non-error response; "avg response" is the mean latency of successful checks in that window. Rankings update automatically as new checks come in. Read more in our About page.
Looking for more APIs in this category? View the Free Weather APIs collection →