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

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As of 4:56 PM CST on January 6, 2026, all 32 cities in St. Clair County, IL in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Belleville, IL with a reading of 0.2.

Over the next 24 hours, the highest UV Index reading in St. Clair County, IL is expected to be 2.2 in Paderborn between 12:00 PM - 1:00 PM CST tomorrow.

Search Cities in St. Clair County, IL

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

• Alorton - 0.2
• Belleville - 0.2
• Brooklyn - 0.2
• Cahokia - 0.2
• Caseyville - 0.2
• Centreville - 0.2
• Darmstadt - 0.2
• Dupo - 0.2
• East Carondelet - 0.2
• East St. Louis - 0.2
• Fairmont City - 0.2
• Fairview Heights - 0.2
• Fayetteville - 0.2
• Floraville - 0.2
• Freeburg - 0.2
• Lebanon - 0.2
• Lenzburg - 0.2
• Marissa - 0.2
• Mascoutah - 0.2
• Millstadt - 0.2
• New Athens - 0.2
• O'Fallon - 0.2
• Paderborn - 0.2
• Rentchler - 0.2
• Sauget - 0.2
• Scott AFB - 0.2
• Shiloh - 0.2
• Smithton - 0.2
• St. Libory - 0.2
• Summerfield - 0.2
• Swansea - 0.2
• Washington Park - 0.2