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Weather Underground API vs US Weather

Same instrument, two spec sheets — measured, not claimed.

APIWeather Underground APION SCHEDULE—US WeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedU.S. Government work / public domain
Free tierFree tier — API key may be required for productionFree (US Government public data)
Rate limitUnpublishedUnpublished (asks for a User-Agent identifying your app)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Weather Underground API vs US Weather: common questions

Which is more reliable, Weather Underground API or US Weather?

Only US Weather is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Weather Underground API and US Weather need an API key?

US Weather needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for US Weather first.

Can I call Weather Underground API and US Weather from the browser?

Yes — both Weather Underground API and US Weather send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Weather Underground API and US Weather free for commercial use?

Weather Underground API has unclear commercial terms, and US Weather allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.