UV Index Today in St. Louis city, Missouri (MO)
Friday, May 22, 2026 -1:41 PMCDT (GMT-5)
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The average maximum UV Index today across 17 locations in St. Louis city, Missouri (MO), is 1.7. The highest projected maximum is 2.1 in East St. Louis at 12:00 PM CDT, while the lowest projected maximum is 1.6 in St. Louis at 2:00 PM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 7.7. The highest projected maximum is 8.3 in East St. Louis at 1:00 PM CDT, and the lowest projected maximum is 7.4 in St. Louis at 1:00 PM CDT.
17 Places in St. Louis city, Missouri (MO)
Maximum UV Index Today