McHenry County, IL: Current UV Index and Hourly Forecast

As of 11:42 PM CDT on August 1, 2025, all 40 cities in McHenry County, IL in our database have a UV Index reading of 0, indicating no radiation from the sun.

Over the next 24 hours, the highest UV Index reading in McHenry County, IL is expected to be 7.8 in Crystal Lake between 1:00 PM - 2:00 PM CDT tomorrow.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in McHenry County, IL as of 11:42 PM CDT, August 1, 2025

Current UV Index in Cities in McHenry County, IL

11:42 PM CDT, August 1, 2025