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Weather Underground API vs Open-Meteo

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

APIWeather Underground APION SCHEDULE—Open-MeteoHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearno
Data licenseUnverifiedCC-BY 4.0
Free tierFree tier — API key may be required for production<10,000 calls/day, no signup
Rate limitUnpublished600/min · 5,000/hour
In directory since2026-07-052026-05-02
operationalpartialdownno data

Weather Underground API vs Open-Meteo: common questions

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

Only Open-Meteo 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 Open-Meteo 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 Weather Underground API and Open-Meteo from the browser?

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

Weather Underground API has unclear commercial terms, and Open-Meteo is personal/non-commercial only. 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.