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Glax Weather API vs Weather Underground API

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

APIGlax Weather APINEW—Weather Underground APIREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Glax Weather API vs Weather Underground API: common questions

Which is more reliable, Glax Weather API or Weather Underground API?

On our scheduled checks, Weather Underground API leads on measured uptime — Glax Weather API 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 Glax Weather API and Weather Underground API need an API key?

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

Can I call Glax Weather API and Weather Underground API from the browser?

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

Are Glax Weather API and Weather Underground API free for commercial use?

Glax Weather API 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.