
Radar data collected from different websites across the Internet.
RainViewer API is a free Weather API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Learn how to use the RainViewer API to access weather radar data for personal and educational use.
Details from rainviewer.com.

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The RainViewer API is provided by RainViewer (rainviewer.com). Learn how to use the RainViewer API to access weather radar data for personal and educational use.
Yes. The RainViewer API is listed in the Weather category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The RainViewer API requires no authentication, so you can start making requests without signing up.
CORS support for the RainViewer API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The RainViewer API is served over HTTPS, so it's safe to use in production.