Chicago, Illinois – A sharp temperature swing begins today, with chilly 40s across Illinois quickly giving way to an 80-degree surge by Thursday before storms and a cold snap hit within hours.
According to the National Weather Service in Chicago, highs will stay in the low to mid-40s today, with lakeshore areas stuck in the 30s due to cold air off Lake Michigan. That chill fades fast Tuesday through Thursday as temperatures climb roughly 10 degrees each day, peaking between 74 and 84 degrees by Thursday afternoon.
The rapid warmup will be felt across the state, from Rockford to Springfield, with Chicago expected to jump from the low 50s Tuesday into the 60s Wednesday. By Thursday, summer-like warmth could impact commutes and outdoor plans statewide, especially during the late afternoon.
A strong cold front arrives late Thursday, bringing a chance for evening thunderstorms that could affect travel along I-90, I-55, and I-294 during peak hours. Gusty winds and brief downpours may reduce visibility and slow traffic.
By Friday, temperatures crash back into the low 40s with breezy conditions, creating another abrupt shift. Residents should prepare for rapid changes this week, as additional advisories may be issued ahead of Thursday’s storms.
