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

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As of 12:58 PM CDT on April 19, 2026, all 32 cities in St. Clair County, IL in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Belleville, IL with a reading of 6.7.

Over the next 24 hours, the highest UV Index reading in St. Clair County, IL is expected to be 7.3 in New Athens 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 - 6.7
• Belleville - 6.7
• Brooklyn - 6.5
• Cahokia - 6.6
• Caseyville - 6.5
• Centreville - 6.7
• Darmstadt - 6.7
• Dupo - 6.6
• East Carondelet - 6.6
• East St. Louis - 6.6
• Fairmont City - 6.5
• Fairview Heights - 6.7
• Fayetteville - 6.7
• Floraville - 6.7
• Freeburg - 6.7
• Lebanon - 6.7
• Lenzburg - 6.7
• Marissa - 6.7
• Mascoutah - 6.7
• Millstadt - 6.7
• New Athens - 6.7
• O'Fallon - 6.7
• Paderborn - 6.7
• Rentchler - 6.7
• Sauget - 6.6
• Scott AFB - 6.7
• Shiloh - 6.7
• Smithton - 6.7
• St. Libory - 6.7
• Summerfield - 6.7
• Swansea - 6.7
• Washington Park - 6.5