What OpenWeatherMap's terms say
OpenWeatherMap's terms of service and privacy policy have 5 rated points: 0 serious, 2 bad, 2 worth knowing and 1 good. 5 apply whenever you use the site, signed in or not; 0 only once you have an account.
Whenever you use OpenWeatherMap
Bad 2
Terms may be changed any time at their discretion, without notice to you
Terms may be changed any time at their discretion, without notice to the user
Where it says this ↗Third-party cookies are used for statistics
Where it says this ↗
Worth knowing 2
Your IP address is collected, which can be used to view your approximate location
This service collects your IP address, which can be used to view your approximate location
Where it says this ↗There is a date of the last update of the agreements
Where it says this ↗
Good 1
You can request access, correction and/or deletion of your data
Where it says this ↗
If you have a OpenWeatherMap account
No account-only points rated.
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.