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Weather Underground API vs Weatherstack

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

APIWeather Underground APIREACHABLE100WeatherstackHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms104309
P95 · ms11171372
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?

Both are neck-and-neck — Weather Underground API and Weatherstack each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Weather Underground API or Weatherstack?

Weather Underground API has the lower median latency in our checks — Weather Underground API responds in 104 ms versus Weatherstack at 309 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.