UV Index Today in St. Clair County, Illinois (IL)
Saturday, August 15, 2026 -2:02 AM CDT (GMT-5)
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The average maximum UV Index today across 50 locations in St. Clair County, Illinois (IL), is 8.8. The highest projected maximum is 9 in New Athens at 1:00 PM CDT, while the lowest projected maximum is 8.1 in St. Louis at 1:00 PM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 7.7. The highest projected maximum is 8.2 in Prairie Du Long at 2:00 PM CDT, and the lowest projected maximum is 7.3 in New Athens at 12:00 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