7Timer!
FreeLiveLast verified 24 Sept 2026
GFS-based multi-day forecasts by coordinate, including sky seeing and transparency for stargazing.
Example request
curl -s 'https://www.7timer.info/bin/api.pl?lon=113.17&lat=23.09&product=astro&output=json'
Free tier, in plain English
Free with no key and no published request limit. Use must be non-commercial, and developers are asked to tell the operator they are using it.
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