St. Clair County, IL: Current UV Index and Hourly Forecast

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As of 11:44 AM CDT on June 7, 2026, out of 32 cities in St. Clair County, IL in our database, 31 cities (97%) have a UV Index reading of Very High, while 1 city (3%) have a UV Index reading of High. The city with the highest UV Index reading right now is Belleville, IL with a reading of 7.7.

Over the next 24 hours, the highest UV Index reading in St. Clair County, IL is expected to be 9.7 in Paderborn between 1:00 PM - 2:00 PM CDT today.

Search Cities in St. Clair County, IL

Current UV Index in Cities in St. Clair County, IL

• Alorton - 7.7
• Belleville - 7.7
• Brooklyn - 7.5
• Cahokia - 7.5
• Caseyville - 7.6
• Centreville - 7.7
• Darmstadt - 7.6
• Dupo - 7.5
• East Carondelet - 7.5
• East St. Louis - 7.5
• Fairmont City - 7.6
• Fairview Heights - 7.7
• Fayetteville - 7.5
• Floraville - 7.7
• Freeburg - 7.7
• Lebanon - 7.5
• Lenzburg - 7.6
• Marissa - 7.6
• Mascoutah - 7.5
• Millstadt - 7.7
• New Athens - 7.6
• O'Fallon - 7.7
• Paderborn - 7.4
• Rentchler - 7.5
• Sauget - 7.5
• Scott AFB - 7.5
• Shiloh - 7.7
• Smithton - 7.7
• St. Libory - 7.6
• Summerfield - 7.5
• Swansea - 7.7
• Washington Park - 7.6