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Weatherstack vs US Weather

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

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

Weatherstack vs US Weather: common questions

Which is more reliable, Weatherstack or US Weather?

On our scheduled checks, US Weather leads on measured uptime — Weatherstack at —% versus US Weather at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Weatherstack and US Weather need an API key?

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

Can I call Weatherstack and US Weather from the browser?

Only US Weather is browser-friendly — it returns CORS headers over HTTPS. Weatherstack needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Weatherstack and US Weather free for commercial use?

Weatherstack 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.