Temperatures are expected to dip considerably overnight Wednesday and into Thursday, with a frost advisory in effect for swaths of the area.
According to the National Weather Service, that advisory will go into effect at midnight and run through mid-morning Thursday in DeKalb, LaSalle, Grundy and Kankakee counties.
Temperatures are expected to hover around the freezing mark in those counties, which could produce frost that could harm sensitive outdoor vegetation, according to the alert.
Residents are advised to cover sensitive plants, or to bring them indoors if possible.
Thursday is expected to be a mostly sunny day, but cool temperatures are still expected, with high temperatures in the low-to-mid 50s across the area, according to the NBC 5 Storm Team.
While temperatures are expected to remain above the freezing mark on Wednesday night and into Thursday in communities closer to Chicago, virtually the entire area could be at risk of frost Thursday night and into Friday, according to forecast models. Temperatures in outlying areas away from the urban heat island could even see lows in the upper-200s, which could result in a freeze, according to the National Weather Service.
Areas closer to Chicago could still see frost overnight into Friday morning before a small warming trend takes hold.
After another day in the low-to-mid 50s Friday, Saturday’s readings could be warmer, potentially approaching 60 degrees during the day. Conditions will still be on the cool side overnight, but lows will likely be in the upper-30s or low-40s, according to forecast models.
Late Sunday, a round of showers could arrive in the area and stick around until Monday morning, with the accompanying front potentially causing temps to drop back into the mid-to-upper 5s across the area. More rain could arrive Tuesday, and that system could stick around through Wednesday, producing rain and cloudy skies in the region.
While the Halloween forecast is still being evaluated, there is a chance readings could be in the upper-50s for trick-or-treaters, with partly-to-mostly cloudy skies in the forecast for the big night.
Stay tuned to the NBC 5 Storm Team for all the latest weather news and forecasts, and download the NBC Chicago app for real-time weather alerts sent directly to your phone.
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