UV Index Today in Wisconsin (WI)

Friday, May 22, 2026 -1:37 PMCDT (GMT-5)

The average maximum UV Index today across 1,516 locations in Wisconsin (WI), is 7. The highest projected maximum is 7.7 in Waupaca at 1:00 PM CDT, while the lowest projected maximum is 3.5 in Grantsburg at 2:00 PM CDT.

Tomorrow, the average maximum UV Index across those same locations is expected to be 5. The highest projected maximum is 7.7 in Milwaukee at 1:00 PM CDT, and the lowest projected maximum is 1.3 in Marshfield at 2:00 PM CDT.

Data Source: National Oceanic and Atmospheric Administration (NOAA)

72 Counties in Wisconsin (WI)

Average Maximum UV Index Today
  • Brown County - 7.4
  • Dane County - 7.1
  • Milwaukee County - 7.2
  • Waukesha County - 7.2
Data Source: National Oceanic and Atmospheric Administration (NOAA)

538 Places in Wisconsin (WI)

Maximum UV Index Today
  • Madison - 7.2
  • Milwaukee - 7.1
Data Source: National Oceanic and Atmospheric Administration (NOAA)