Madison County, IL: Current UV Index and Hourly Forecast

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As of 3:17 PM CDT on July 7, 2026, out of 32 cities in Madison County, IL in our database, 26 cities (81%) have a UV Index reading of High, while 6 cities (19%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Alton, IL with a reading of 5.9.

Over the next 24 hours, the highest UV Index reading in Madison County, IL is expected to be 9.1 in Alton between 1:00 PM - 2:00 PM CDT tomorrow.

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Current UV Index in Cities in Madison County, IL

• Alhambra - 5.3
• Alton - 5.9
• Bethalto - 5.8
• Collinsville - 5.6
• East Alton - 5.8
• Edwardsville - 5.6
• Glen Carbon - 5.6
• Godfrey - 5.9
• Granite City - 5.8
• Grantfork - 5.7
• Hamel - 5.3
• Hartford - 5.6
• Highland - 5.7
• Holiday Shores - 5.8
• Livingston - 5.3
• Madison - 5.8
• Marine - 5.7
• Maryville - 5.6
• Mitchell - 5.6
• Moro - 5.8
• New Douglas - 5.3
• Pontoon Beach - 5.6
• Prairietown - 5.8
• Rosewood Heights - 5.8
• Roxana - 5.6
• South Roxana - 5.6
• St. Jacob - 5.7
• Troy - 5.6
• Venice - 5.8
• Williamson - 5.3
• Wood River - 5.6
• Worden - 5.3