McHenry County, IL: Current UV Index and Hourly Forecast

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As of 4:24 PM CDT on June 9, 2026, 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 Chemung, IL with a reading of 5.1.

Over the next 24 hours, the highest UV Index reading in McHenry County, IL is expected to be 9.6 in Riley between 1:00 PM - 2:00 PM CDT tomorrow.

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Current UV Index in Cities in McHenry County, IL

• Alden - 4.6
• Algonquin - 4.3
• Big Foot Prairie - 4.6
• Bull Valley - 4.3
• Burtons Bridge - 4.3
• Cary - 4.3
• Chemung - 5.1
• Coral - 4.3
• Crystal Lake - 4.3
• Fox River Grove - 4.3
• Franklinville - 4.3
• Greenwood - 4.6
• Harmony - 4.3
• Hartland - 4.3
• Harvard - 4.6
• Hebron - 4.6
• Holiday Hills - 4.3
• Huntley - 4.3
• Island Lake - 4.3
• Johnsburg - 3.7
• Lake in the Hills - 4.3
• Lakemoor - 4.3
• Lakewood - 4.3
• Lawrence - 5.1
• Marengo - 4.3
• McCullom Lake - 4.3
• McHenry - 4.3
• Oakwood Hills - 4.3
• Pistakee Highlands - 3.7
• Prairie Grove - 4.3
• Richmond - 3.7
• Ridgefield - 4.3
• Riley - 3.9
• Ringwood - 3.7
• Solon Mills - 3.7
• Spring Grove - 3.7
• Trout Valley - 4.3
• Union - 4.3
• Wonder Lake - 3.7
• Woodstock - 4.3