McHenry County, IL: Current UV Index and Hourly Forecast

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As of 2:16 PM CST on November 12, 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 1.3.

Over the next 24 hours, the highest UV Index reading in McHenry County, IL is expected to be 2.2 in Huntley between 12:00 PM - 1:00 PM CST tomorrow.

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Current UV Index in Cities in McHenry County, IL

• Alden - 1.3
• Algonquin - 1.3
• Big Foot Prairie - 1.3
• Bull Valley - 1.3
• Burtons Bridge - 1.3
• Cary - 1.3
• Chemung - 1.3
• Coral - 1.3
• Crystal Lake - 1.3
• Fox River Grove - 1.3
• Franklinville - 1.3
• Greenwood - 1.3
• Harmony - 1.3
• Hartland - 1.3
• Harvard - 1.3
• Hebron - 1.3
• Holiday Hills - 1.3
• Huntley - 1.3
• Island Lake - 1.3
• Johnsburg - 1.3
• Lake in the Hills - 1.3
• Lakemoor - 1.3
• Lakewood - 1.3
• Lawrence - 1.3
• Marengo - 1.3
• McCullom Lake - 1.3
• McHenry - 1.3
• Oakwood Hills - 1.3
• Pistakee Highlands - 1.3
• Prairie Grove - 1.3
• Richmond - 1.3
• Ridgefield - 1.3
• Riley - 1.3
• Ringwood - 1.3
• Solon Mills - 1.3
• Spring Grove - 1.3
• Trout Valley - 1.3
• Union - 1.3
• Wonder Lake - 1.3
• Woodstock - 1.3