Chicago, Illinois – A sharp temperature divide is already impacting the region today, with lakeshore areas running nearly 20 degrees cooler than inland suburbs, setting the stage for a more disruptive round of storms Monday evening.
According to the National Weather Service in Chicago, Sunday highs range from the mid-50s near Lake Michigan to the mid-70s farther inland. Conditions remain dry today, but winds will increase Monday as temperatures climb into the upper 60s to upper 70s ahead of an approaching storm system.
Severe thunderstorms are expected to develop late Monday afternoon and evening, roughly between 4 p.m. and 10 p.m., with the greatest impacts across northeast Illinois, including Chicago, Joliet, Naperville, and Waukegan. Storms may produce damaging wind gusts near 70 mph, large hail, and heavy rainfall capable of reducing visibility on major routes such as I-90, I-94, and I-55.
The evening commute is most at risk, with potential for sudden slowdowns, debris on roadways, and scattered power outages. Lake-cooled air may slightly limit storm intensity closer to the immediate shoreline, but inland areas face a higher risk.
Residents should secure outdoor items, monitor alerts, and prepare for rapidly changing conditions Monday afternoon. Storms may continue into Monday night before cooler, quieter weather settles in by midweek.
