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Weather Underground API vs Website Carbon

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

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

Weather Underground API vs Website Carbon: common questions

Which is more reliable, Weather Underground API or Website Carbon?

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

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

Can I call Weather Underground API and Website Carbon from the browser?

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

Are Weather Underground API and Website Carbon free for commercial use?

Weather Underground API has unclear commercial terms, and Website Carbon 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.