Williamson County, IL: Current UV Index and Hourly Forecast

As of 5:16 AM CDT on June 28, 2025, all 16 cities in Williamson 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 Williamson County, IL is expected to be 10.4 in Marion between 1:00 PM - 2:00 PM CDT today.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Williamson County, IL as of 5:16 AM CDT, June 28, 2025

Current UV Index in Cities in Williamson County, IL

5:16 AM CDT, June 28, 2025