Chicago, Illinois – A lake-enhanced cold front is pushing through northern Illinois Saturday, triggering a steep drop in temperatures across the region and setting the stage for isolated thunderstorms to begin south of I-80 early next week.
According to the National Weather Service in Chicago, breezy conditions and falling afternoon temperatures Saturday will mark the start of a cooler pattern near the lake, with highs dipping into the 60s along the shore and 70s inland. Overnight lows could plunge into the upper 30s in outlying areas by Sunday morning.
On Monday, a surge of summer-like warmth returns inland, but areas along and south of I-80 should prepare for scattered thunderstorms—some potentially strong. Storm chances increase again Tuesday and Wednesday, especially near the Lake Michigan shoreline, where cooler air may create sharp temperature gradients and enhance storm development.
Communities including Joliet, Kankakee, and Ottawa may see repeated rounds of thunderstorm activity through midweek, bringing possible downpours and gusty winds. Residents should monitor local alerts and secure outdoor items this weekend ahead of changing conditions.
Cooler lake breezes will likely persist near Chicago through Wednesday, while storm chances south of the metro area continue. Additional alerts may be issued as models refine storm timing and severity.
