Jefferson County, IL: Current UV Index and Hourly Forecast

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As of 9:29 AM CDT on March 22, 2026, all 10 cities in Jefferson County, IL in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Mount Vernon, IL with a reading of 1.3.

Over the next 24 hours, the highest UV Index reading in Jefferson County, IL is expected to be 6.6 in Bluford between 1:00 PM - 2:00 PM CDT today.

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Current UV Index in Cities in Jefferson County, IL

• Belle Rive - 1.3
• Bluford - 1.3
• Bonnie - 1.3
• Dix - 1.3
• Ina - 1.3
• Mount Vernon - 1.3
• Nason - 1.3
• Opdyke - 1.3
• Waltonville - 1.3
• Woodlawn - 1.3