
Global real-time nowcasting API powered by radar + satellite fusion.
Rainbow Weather API is a free Weather API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from developer.rainbow.ai.

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The Rainbow Weather API is provided by Rainbow Weather (developer.rainbow.ai).
Yes. The Rainbow Weather 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.
Yes. The Rainbow Weather API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Rainbow Weather API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Rainbow Weather API is served over HTTPS, so it's safe to use in production.