Jefferson County, IL: Current UV Index and Hourly Forecast

As of 2:27 PM CDT on August 7, 2025, all 10 cities in Jefferson County, IL in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Bluford, IL with a reading of 8.2.

Over the next 24 hours, the highest UV Index reading in Jefferson County, IL is expected to be 8.9 in Mount Vernon between 1:00 PM - 2:00 PM CDT tomorrow.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Jefferson County, IL as of 2:27 PM CDT, August 7, 2025

Current UV Index in Cities in Jefferson County, IL

2:27 PM CDT, August 7, 2025