St. Clair County, IL: Current UV Index and Hourly Forecast

As of 5:11 PM CST on February 17, 2026, all 32 cities in St. Clair County, IL in our database have a UV Index reading of 0, indicating no radiation from the sun.

Over the next 24 hours, the highest UV Index reading in St. Clair County, IL is expected to be 3.8 in East St. Louis between 12:00 PM - 1:00 PM CST tomorrow.

Search Cities in St. Clair County, IL

UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in St. Clair County, IL as of 5:11 PM CST, February 17, 2026

Current UV Index in Cities in St. Clair County, IL

5:11 PM CST, February 17, 2026