McHenry County, IL: Current UV Index and Hourly Forecast

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As of 6:52 AM CDT on August 22, 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 8.4 in Chemung between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in McHenry County, IL

• Alden - 0
• Algonquin - 0
• Big Foot Prairie - 0
• Bull Valley - 0
• Burtons Bridge - 0
• Cary - 0
• Chemung - 0
• Coral - 0
• Crystal Lake - 0
• Fox River Grove - 0
• Franklinville - 0
• Greenwood - 0
• Harmony - 0
• Hartland - 0
• Harvard - 0
• Hebron - 0
• Holiday Hills - 0
• Huntley - 0
• Island Lake - 0
• Johnsburg - 0
• Lake in the Hills - 0
• Lakemoor - 0
• Lakewood - 0
• Lawrence - 0
• Marengo - 0
• McCullom Lake - 0
• McHenry - 0
• Oakwood Hills - 0
• Pistakee Highlands - 0
• Prairie Grove - 0
• Richmond - 0
• Ridgefield - 0
• Riley - 0
• Ringwood - 0
• Solon Mills - 0
• Spring Grove - 0
• Trout Valley - 0
• Union - 0
• Wonder Lake - 0
• Woodstock - 0