McHenry County, IL: Current UV Index and Hourly Forecast

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As of 7:38 AM CDT on June 7, 2025, all 40 cities in McHenry County, IL in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Crystal Lake, IL with a reading of 0.5.

Over the next 24 hours, the highest UV Index reading in McHenry County, IL is expected to be 7.4 in Harvard between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in McHenry County, IL

• Alden - 0.5
• Algonquin - 0.5
• Big Foot Prairie - 0.5
• Bull Valley - 0.5
• Burtons Bridge - 0.5
• Cary - 0.5
• Chemung - 0.5
• Coral - 0.5
• Crystal Lake - 0.5
• Fox River Grove - 0.5
• Franklinville - 0.5
• Greenwood - 0.5
• Harmony - 0.5
• Hartland - 0.5
• Harvard - 0.5
• Hebron - 0.5
• Holiday Hills - 0.5
• Huntley - 0.5
• Island Lake - 0.5
• Johnsburg - 0.5
• Lake in the Hills - 0.5
• Lakemoor - 0.5
• Lakewood - 0.5
• Lawrence - 0.5
• Marengo - 0.5
• McCullom Lake - 0.5
• McHenry - 0.5
• Oakwood Hills - 0.5
• Pistakee Highlands - 0.5
• Prairie Grove - 0.5
• Richmond - 0.5
• Ridgefield - 0.5
• Riley - 0.4
• Ringwood - 0.5
• Solon Mills - 0.5
• Spring Grove - 0.5
• Trout Valley - 0.5
• Union - 0.5
• Wonder Lake - 0.5
• Woodstock - 0.5