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Weather Underground API vs wttr.in

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

APIWeather Underground APION SCHEDULE—wttr.inNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — limits not published
Rate limitUnpublishedUnpublished (informal per-IP throttling)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Weather Underground API vs wttr.in: common questions

Which is more reliable, Weather Underground API or wttr.in?

Only wttr.in 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 wttr.in need an API key?

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

Can I call Weather Underground API and wttr.in from the browser?

Yes — both Weather Underground API and wttr.in 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 wttr.in free for commercial use?

Weather Underground API has unclear commercial terms, and wttr.in 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.