@ebcase
Time shown on time line of the map and on meteograms tables is your local time.
But if you select a location with the weather picker far from your location (out of your time zone) then the time line is displayed according to the time zone of the picker.
See this related post:
https://community.windy.com/topic/14821/which-time-zone?_=1662099797750
To check what time is shown, in Settings you can Show all times in UTC.
It should clarify which time zone is shown.