McHenry County, IL: Current UV Index and Hourly Forecast

As of 1:39 PM CDT on April 21, 2025, all 40 cities in McHenry County, IL in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Riley, IL with a reading of 3.3.

Over the next 24 hours, the highest UV Index reading in McHenry County, IL is expected to be 6.6 in Crystal Lake between 12:00 PM - 1:00 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 1:39 PM CDT, April 21, 2025

Current UV Index in Cities in McHenry County, IL

1:39 PM CDT, April 21, 2025