Weather
Illinois Weather Alert: Lake-Effect Snow Possible, Lows Near 23° Nov 12-13
Chicago, IL – Residents across northeastern Illinois and northwestern Indiana could see their first taste of winterlike weather this week as temperatures plunge from the lower 60s into the 40s, with l
By Caleb Mercer · 2026-11-09T09:48:18.323Z
Chicago, IL – Residents across northeastern Illinois and northwestern Indiana could see their first taste of winterlike weather this week as temperatures plunge from the lower 60s into the 40s, with lake effect rain and possibly snow developing near Lake Michigan Thursday and Friday.
According to the National Weather Service NWS in Chicago, dry and mild conditions will continue through Tuesday, November 10, before a midweek weather system brings rain, colder temperatures and lake effect precipitation later in the week.
Monday will feature partly sunny skies with highs between 58 and 63 degrees, followed by overnight lows of 39 to 45 degrees.
Tuesday remains mild, with afternoon temperatures reaching 57 to 64 degrees.
Rain Arrives Wednesday Before Colder Air Moves In Wednesday, November 11, brings a 40% to 60% chance of rain across the Chicago region, with afternoon highs ranging from 52 to 61 degrees.
Rain chances continue Wednesday night as temperatures fall into the 34 43 degree range.
A colder weather pattern will then settle across northeastern Illinois and northwestern Indiana.
Lake Effect Snow Possible Thursday and Friday By Thursday, November 12, afternoon highs will fall to between 42 and 48 degrees, with overnight temperatures dropping as low as 26 degrees in some locations.
The NWS expects lake effect precipitation to develop near Lake Michigan, primarily affecting northwestern Indiana, although some activity could extend into northeastern Illinois.
With colder air arriving, some precipitation could fall as snow, particularly during colder periods.
Friday remains chilly, with highs between 42 and 45 degrees and additional chances for lake effect rain or snow.
Whether snow develops at specific locations will depend on temperatures, wind direction and the placement of lake effect precipitation bands.
No snowfall accumulations have been specified.
Temperatures Could Fall Into the Lower 20s Friday night could bring the coldest temperatures of the week, with regional lows ranging from 23 to 34 degrees.
That represents a dramatic change from the mild conditions expected Monday and Tuesday.
Residents traveling through the Chicago metropolitan area and northwest Indiana should monitor updated forecasts as the colder pattern develops.
While significant snowfall has not been forecast, the possibility of snow mixing with lake effect showers remains worth watching.