St. Louis County, MO: Current UV Index and Hourly Forecast

As of 8:20 AM CDT on August 5, 2025, all 98 cities in St. Louis County, MO in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Florissant, MO with a reading of 0.9.

Over the next 24 hours, the highest UV Index reading in St. Louis County, MO is expected to be 8.6 in Wildwood between 1:00 PM - 2:00 PM CDT today.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in St. Louis County, MO as of 8:20 AM CDT, August 5, 2025

Current UV Index in Cities in St. Louis County, MO

8:20 AM CDT, August 5, 2025