Now-9am: Dense fog advisory in much of central Illinois

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Light from a street lamp shows through leaves and dense fog in Champaign on November 20, 2025.

URBANA – The National Weather Service in Lincoln has posted a Dense Fog Advisory for much of central and southwest Illinois until mid-morning on Friday.

Cass, Champaign, DeWitt, Fulton, Logan, Macon, Mason, McLean, Menard, Morgan, Piatt,  Sangamon, Schuyler, Scott, Tazewell, Vermilion, and Woodford Counties are included in the advisory.

Meteorologists advise that if you plan to drive, slow down and ensure your low beam headlights are on. Visibility may down to a quarter-mile or less in many areas.

In Champaign on Thursday night, heavy fog was very thick.

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A vehicle drives through dense fog on November 20, 2025 in Champaign. (IPM News)
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Sculpture surrounded in dense fog at Champaign’s West Side Park on November 20, 2025. (IPM News)
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Trees in Champaign’s West Side Park are surrounded by heavy fog on November 20, 2025. (IPM News)

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