Weather Underground API vs wttr.in
Same instrument, two spec sheets — measured, not claimed.
Weather Underground API vs wttr.in: common questions
Which is more reliable, Weather Underground API or wttr.in?
On our scheduled checks, Weather Underground API leads on measured uptime — Weather Underground API at 100% versus wttr.in at 95.1% 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, Weather Underground API or wttr.in?
Weather Underground API has the lower median latency in our checks — Weather Underground API responds in 104 ms versus wttr.in at 700 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 Weather Underground API and wttr.in need an API key?
wttr.in needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for wttr.in first.
Can I call Weather Underground API and wttr.in from the browser?
Yes — both Weather Underground API and wttr.in 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 wttr.in free for commercial use?
Weather Underground API has unclear commercial terms, and wttr.in 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.