Madison County, IL: Current UV Index and Hourly Forecast

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As of 3:27 PM CDT on May 20, 2026, out of 32 cities in Madison County, IL in our database, 26 cities (81%) have a UV Index reading of Low, while 6 cities (19%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Hamel, IL with a reading of 2.5.

Over the next 24 hours, the highest UV Index reading in Madison County, IL is expected to be 7.7 in Alton between 12:00 PM - 1:00 PM CDT tomorrow.

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Current UV Index in Cities in Madison County, IL

• Alhambra - 2.5
• Alton - 1.9
• Bethalto - 2
• Collinsville - 2.2
• East Alton - 2
• Edwardsville - 2.2
• Glen Carbon - 2.2
• Godfrey - 1.9
• Granite City - 1.8
• Grantfork - 2.2
• Hamel - 2.5
• Hartford - 2.2
• Highland - 2.2
• Holiday Shores - 2
• Livingston - 2.5
• Madison - 1.8
• Marine - 2.2
• Maryville - 2.2
• Mitchell - 2.2
• Moro - 2
• New Douglas - 2.5
• Pontoon Beach - 2.2
• Prairietown - 2
• Rosewood Heights - 2
• Roxana - 2.2
• South Roxana - 2.2
• St. Jacob - 2.2
• Troy - 2.2
• Venice - 1.8
• Williamson - 2.5
• Wood River - 2.2
• Worden - 2.5