Sunrise-Sunset vs Weather Underground API
Same instrument, two spec sheets — measured, not claimed.
Sunrise-Sunset vs Weather Underground API: common questions
Which is more reliable, Sunrise-Sunset or Weather Underground API?
On our scheduled checks, Weather Underground API leads on measured uptime — Sunrise-Sunset at 99.02% versus Weather Underground API at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Sunrise-Sunset or Weather Underground API?
Weather Underground API has the lower median latency in our checks — Sunrise-Sunset responds in 204 ms versus Weather Underground API at 104 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 Sunrise-Sunset and Weather Underground API need an API key?
Sunrise-Sunset needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for Sunrise-Sunset first.
Can I call Sunrise-Sunset and Weather Underground API from the browser?
Yes — both Sunrise-Sunset 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 Sunrise-Sunset and Weather Underground API free for commercial use?
Sunrise-Sunset 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.