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

As of 10:47 AM CDT on July 13, 2025, all 98 cities in St. Louis County, MO in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Chesterfield, MO with a reading of 5.1.

Over the next 24 hours, the highest UV Index reading in St. Louis County, MO is expected to be 9.9 in Oakville 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 10:47 AM CDT, July 13, 2025

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

10:47 AM CDT, July 13, 2025