Johnson County, IL: Current UV Index and Hourly Forecast

As of 2:21 PM CDT on April 1, 2025, all 7 cities in Johnson County, IL in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Vienna, IL with a reading of 5.9.

Over the next 24 hours, the highest UV Index reading in Johnson County, IL is expected to be 5.9 in Vienna 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 Johnson County, IL as of 2:21 PM CDT, April 1, 2025

Current UV Index in Cities in Johnson County, IL

2:21 PM CDT, April 1, 2025