Chicago, Illinois – Hot, humid air is settling over Illinois as summer weekend plans across the Chicago area face increasing storm chances and rising flood risks by Sunday night. Sunday’s high near 93°F combined with late-day thunderstorms could bring dangerous driving and outdoor conditions, particularly along I-55, I-80, and surface roads in Cook and Will counties.
According to the National Weather Service in Romeoville, isolated storms may develop Sunday afternoon, but the most active period begins Sunday night with a 60% chance of showers and thunderstorms. Monday continues the pattern with elevated thunderstorm and flooding risks. No severe storms are expected tonight or Friday, but heat index values could reach the upper 90s through the weekend.
Saturday will be the last dry day for many with sunny skies and highs near 75°F — a good time to run errands or enjoy outdoor events before Sunday’s active weather. Winds remain light through Saturday before increasing Sunday with gusts up to 25 mph during storms.
Drivers should avoid flooded roadways and prepare for power disruptions if storms intensify. Residents are advised to charge devices, secure outdoor furniture, and monitor alerts from NWS Chicago.
Looking ahead:
- Friday, June 27: Mostly sunny, high near 90°F. Slight chance of PM storms.
- Saturday, June 28: Sunny and pleasant. High 75°F.
- Sunday, June 29: Hot, high 93°F. Thunderstorms likely after 1 p.m. into the night.
- Monday, June 30: Scattered thunderstorms, high 88°F. Flooding possible.
- Tuesday, July 1: Mostly sunny, highs in upper 80s — leading into a warm, storm-free Fourth of July week.
