McHenry County, IL: Current UV Index and Hourly Forecast

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As of 10:44 AM CDT on May 12, 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 Harvard, IL with a reading of 4.8.

Over the next 24 hours, the highest UV Index reading in McHenry County, IL is expected to be 8.8 in Huntley between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in McHenry County, IL

• Alden - 4.8
• Algonquin - 4.7
• Big Foot Prairie - 4.8
• Bull Valley - 4.7
• Burtons Bridge - 4.7
• Cary - 4.7
• Chemung - 4.8
• Coral - 4.7
• Crystal Lake - 4.7
• Fox River Grove - 4.7
• Franklinville - 4.7
• Greenwood - 4.8
• Harmony - 4.7
• Hartland - 4.7
• Harvard - 4.8
• Hebron - 4.8
• Holiday Hills - 4.7
• Huntley - 4.7
• Island Lake - 4.7
• Johnsburg - 4.8
• Lake in the Hills - 4.7
• Lakemoor - 4.7
• Lakewood - 4.7
• Lawrence - 4.8
• Marengo - 4.7
• McCullom Lake - 4.7
• McHenry - 4.7
• Oakwood Hills - 4.7
• Pistakee Highlands - 4.8
• Prairie Grove - 4.7
• Richmond - 4.8
• Ridgefield - 4.7
• Riley - 4.8
• Ringwood - 4.8
• Solon Mills - 4.8
• Spring Grove - 4.8
• Trout Valley - 4.7
• Union - 4.7
• Wonder Lake - 4.8
• Woodstock - 4.7