UV Index Today in St. Clair County, Illinois (IL)
Tuesday, April 7, 2026 - 3:55 AM CDT (GMT-5)
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The average maximum UV Index today across 50 locations in St. Clair County, Illinois (IL), is 5.1. The highest projected maximum is 5.9 in New Athens at 1:00 PM CDT, while the lowest projected maximum is 4.4 in Collinsville at 1:00 PM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 5.5. The highest projected maximum is 5.8 in New Athens at 1:00 PM CDT, and the lowest projected maximum is 5.3 in Collinsville 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