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otter ,

Breezy Weather is FOSS and it seems to have that! I see it listed in the settings under Hourly Trends, although it isn’t displaying on my homescreen even after I enable it. It’s possible my data source doesn’t include that or something similar. Give it a try?

github.com/breezy-weather/breezy-weather

edit: this issue makes me think that hourly UV does exist

Today Weather is not FOSS, but it almost meets your requirements:

  • it shows the current UV on the dashboard
  • it can show the changing UV on the map view, but you would need to drag the slider to the time you are looking for and use the color scale to see it
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