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

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As of 3:29 PM CDT on July 14, 2025, out of 32 cities in St. Clair County, IL in our database, 27 cities (84%) have a UV Index reading of High, while 5 cities (16%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Belleville, IL with a reading of 7.2.

Over the next 24 hours, the highest UV Index reading in St. Clair County, IL is expected to be 10.3 in Caseyville between 1:00 PM - 2:00 PM CDT tomorrow.

Search Cities in St. Clair County, IL

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

• Alorton - 7.2
• Belleville - 7.2
• Brooklyn - 6.9
• Cahokia - 7.2
• Caseyville - 6.9
• Centreville - 7.2
• Darmstadt - 5.3
• Dupo - 7.2
• East Carondelet - 7.2
• East St. Louis - 7.2
• Fairmont City - 6.9
• Fairview Heights - 7.2
• Fayetteville - 7.2
• Floraville - 7.2
• Freeburg - 7.2
• Lebanon - 7.2
• Lenzburg - 5.3
• Marissa - 5.3
• Mascoutah - 7.2
• Millstadt - 7.2
• New Athens - 5.3
• O'Fallon - 7.2
• Paderborn - 7.2
• Rentchler - 7.2
• Sauget - 7.2
• Scott AFB - 7.2
• Shiloh - 7.2
• Smithton - 7.2
• St. Libory - 5.3
• Summerfield - 7.2
• Swansea - 7.2
• Washington Park - 6.9