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Weather Underground API vs Weatherstack

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

APIWeather Underground APIREACHABLE—WeatherstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Weather Underground API vs Weatherstack: common questions

Which is more reliable, Weather Underground API or Weatherstack?

On our scheduled checks, Weatherstack leads on measured uptime — Weather Underground API at —% versus Weatherstack 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 Weather Underground API and Weatherstack need an API key?

Both ask you to authenticate — Weather Underground API uses an API key and Weatherstack uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

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

Only Weather Underground API 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 Weather Underground API and Weatherstack free for commercial use?

Weather Underground API has unclear commercial terms, and Weatherstack has unclear commercial terms. 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.