Jefferson County, IL: Current UV Index and Hourly Forecast

As of 4:44 PM CDT on August 27, 2025, all 10 cities in Jefferson County, IL in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Dix, IL with a reading of 3.4.

Over the next 24 hours, the highest UV Index reading in Jefferson County, IL is expected to be 7.7 in Mount Vernon between 1:00 PM - 2:00 PM CDT tomorrow.

Search Cities in Jefferson County, IL

UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Jefferson County, IL as of 4:44 PM CDT, August 27, 2025

Current UV Index in Cities in Jefferson County, IL

4:44 PM CDT, August 27, 2025