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Open-Meteo vs Weather Underground API

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

APIOpen-MeteoHEALTHY—Weather Underground APIREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial usenounclear
Data licenseCC-BY 4.0Unverified
Free tier<10,000 calls/day, no signupFree tier — API key may be required for production
Rate limit600/min · 5,000/hourUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open-Meteo vs Weather Underground API: common questions

Which is more reliable, Open-Meteo or Weather Underground API?

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

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

Can I call Open-Meteo and Weather Underground API from the browser?

Yes — both Open-Meteo 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 Open-Meteo and Weather Underground API free for commercial use?

Open-Meteo is personal/non-commercial only, 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.