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Weather Underground API vs Sunrise-Sunset

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

APIWeather Underground APION SCHEDULE—Sunrise-SunsetNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree tier — API key may be required for productionUnlimited, attribution requested
Rate limitUnpublishedNo burst traffic
In directory since2026-07-052026-06-22
operationalpartialdownno data

Weather Underground API vs Sunrise-Sunset: common questions

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

Only Sunrise-Sunset 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 Sunrise-Sunset 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 Weather Underground API and Sunrise-Sunset from the browser?

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

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