UV Index Today in St. Clair County, Illinois (IL)
Sunday, September 20, 2026 -11:22 AM CDT (GMT-5)
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The average maximum UV Index today across 50 locations in St. Clair County, Illinois (IL), is 7.1. The highest projected maximum is 7.2 in Belleville at 1:00 PM CDT, while the lowest projected maximum is 7 in St. Louis at 1:00 PM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 3.1. The highest projected maximum is 4.7 in Collinsville at 1:00 PM CDT, and the lowest projected maximum is 2.3 in St. Louis at 1:00 PM CDT.
21 County Subdivisions in St. Clair County, Illinois (IL)
Maximum UV Index Today
29 Places in St. Clair County, Illinois (IL)
Maximum UV Index Today