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Sunrise-Sunset vs Weather Underground API

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

APISunrise-SunsetNEW—Weather Underground APIREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licensen/aUnverified
Free tierUnlimited, attribution requestedFree tier — API key may be required for production
Rate limitNo burst trafficUnpublished
In directory since2026-06-222026-07-05
operationalpartialdownno data

Sunrise-Sunset vs Weather Underground API: common questions

Which is more reliable, Sunrise-Sunset or Weather Underground API?

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

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

Can I call Sunrise-Sunset and Weather Underground API from the browser?

Yes — both Sunrise-Sunset and Weather Underground API 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 Sunrise-Sunset and Weather Underground API free for commercial use?

Sunrise-Sunset has unclear commercial terms, and Weather Underground API 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.