UV Index Today in McHenry County, Illinois (IL)

The average maximum UV Index today across 53 locations in McHenry County, Illinois (IL), is 1.3. The highest projected maximum is 1.5 in Marengo at 11:00 AM CST, while the lowest projected maximum is 1.1 in Grafton at 11:00 AM CST.

Tomorrow, the average maximum UV Index across those same locations is expected to be 0.2. The highest projected maximum is 0.3 in Gilberts at 11:00 AM CST, and the lowest projected maximum is 0.2 in Algonquin at 10:00 AM CST.