Central Illinois Weather Tonight: Patchy Fog, 20% Rain Chance West of I-55

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Lincoln, IL – The National Weather Service Central Illinois reports a chance for spotty light showers (around 20% coverage) across parts of the region this evening, mainly west of Interstate 55. Most areas, however, are expected to remain dry.

Temperatures tonight will dip to 30–39 degrees, with fog developing overnight, especially in rural and low-lying areas. According to the NWS, fog could make elevated surfaces slick by early Sunday morning, so drivers should use caution on bridges and overpasses.

Sunday will bring a return to sunny, dry, and warmer weather, with highs in the mid-50s, climbing into the 60s by Monday and Tuesday. The extended outlook calls for continued dry and mild conditions through midweek.

Forecast Highlights:

  • 20–30% chance of fog west of I-55 early Sunday morning
  • Light rain or graupel possible through 10 p.m. tonight
  • Warming trend begins Sunday, lasting through Wednesday

Residents are encouraged to use caution while traveling overnight and to stay updated with the latest forecasts from the National Weather Service Lincoln.