RainViewer vs wttr.in
Same instrument, two spec sheets — measured, not claimed.
RainViewer vs wttr.in: common questions
Which is more reliable, RainViewer or wttr.in?
On our scheduled checks, wttr.in leads on measured uptime — RainViewer at —% versus wttr.in 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 RainViewer and wttr.in need an API key?
Neither needs a paid key — RainViewer is callable with no signup, and wttr.in is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call RainViewer and wttr.in from the browser?
Yes — both RainViewer 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 RainViewer and wttr.in free for commercial use?
RainViewer 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.