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

As of 9:14 AM CDT on May 12, 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 Chesterfield, MO with a reading of 1.7.

Over the next 24 hours, the highest UV Index reading in St. Louis County, MO is expected to be 6.6 in Chesterfield between 2:00 PM - 3:00 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 9:14 AM CDT, May 12, 2025

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

9:14 AM CDT, May 12, 2025