US Weather vs Weather Underground API
Same instrument, two spec sheets — measured, not claimed.
US Weather vs Weather Underground API: common questions
Which is more reliable, US Weather or Weather Underground API?
On our scheduled checks, Weather Underground API leads on measured uptime — US Weather 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 US Weather and Weather Underground API need an API key?
US Weather needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for US Weather first.
Can I call US Weather and Weather Underground API from the browser?
Yes — both US Weather 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 US Weather and Weather Underground API free for commercial use?
US Weather allows commercial use on its free tier, 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.