UV Index Today in St. Louis County, Missouri (MO)
Sunday, September 20, 2026 -11:23 AM CDT (GMT-5)
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The average maximum UV Index today across 122 locations in St. Louis County, Missouri (MO), is 7. The highest projected maximum is 7 in St. Louis at 1:00 PM CDT, while the lowest projected maximum is 6.8 in Weldon Spring at 1:00 PM CDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 2.9. The highest projected maximum is 4.6 in Weldon Spring at 2:00 PM CDT, and the lowest projected maximum is 2.3 in St. Louis at 1:00 PM CDT.
28 County Subdivisions in St. Louis County, Missouri (MO)
Maximum UV Index Today
94 Places in St. Louis County, Missouri (MO)
Maximum UV Index Today