Chicago, Illinois – Thunderstorms could bring lightning and brief downpours to Chicago by early Sunday afternoon as temperatures climb into the 90s.
According to the National Weather Service, there’s a 30% chance of showers and thunderstorms after 1 p.m. Sunday, June 29. Heat index values may reach 97°F, making outdoor activities riskier in the early afternoon. South winds will increase to 10–15 mph, with gusts potentially higher.
Temperatures are expected to peak around 92°F Sunday before cooler air arrives Monday. Showers and a few thunderstorms are likely Monday, with a 70% chance of precipitation. Independence Day celebrations could benefit from the drier, calmer pattern expected to return midweek.
Drivers on I-55 and I-290 should be alert for slick conditions during Sunday’s afternoon storms and again Monday morning. Outdoor workers and event organizers should stay hydrated and monitor the sky for thunderstorm development.
By Tuesday, Chicago dries out with highs in the mid-80s and plenty of sun. The 4th of July forecast currently shows only a slight chance of storms, with partly sunny skies and a high near 85°F.
Six-Day Weather Outlook for Chicago (June 29–July 4):
- Sunday: High 92°F, 30% chance of PM thunderstorms
- Monday: Showers likely, high 86°F
- Tuesday: Sunny, high 85°F
- Wednesday: Mostly sunny, high 87°F
- Thursday: Sunny, high 85°F
- Friday (4th of July): Chance of Thunderstorms, high 85°F
