Chicago, Illinois – Mid-summer heat and storm chances will dominate the weather pattern across Illinois this week, with strong to severe thunderstorms possible Wednesday afternoon and dangerous swim conditions expected Friday at Lake Michigan.
According to the National Weather Service Chicago, periods of increased humidity and thunderstorms will continue through the weekend. Wednesday brings the highest risk for strong to severe storms, with afternoon heat indices nearing 100°F across much of northern Illinois. The greatest storm threat is expected mainly during the afternoon and evening hours.
Cities along and south of Interstate 80 will see a bit cooler temperatures today, with highs between 85 and 91 degrees. On Thursday, storm chances remain southeast of Interstate 55 with highs dropping into the low 80s. Friday’s cooler air near the lake will bring dangerous swimming conditions, prompting safety warnings for Lake Michigan beaches. Temperatures will remain humid but lower over the weekend, with scattered thunderstorms expected Saturday.
Officials advise residents to prepare for rapidly changing weather, avoid non-essential travel during storms, and stay hydrated during the heat. Charging devices and monitoring local alerts are recommended as the severe weather threat continues through the week. Additional advisories may follow depending on storm developments.
Five-Day Weather Outlook for Chicago, IL
- Tuesday: High 85-91°F, PM storms 20-30%, humid
- Wednesday: High 87-92°F, 20-60% severe storms PM, humid
- Thursday: High 72-82°F, 20-50% storms SE IL, humid
- Friday: High 74-83°F, cooler near lake, dangerous swim conditions
- Saturday: High 80-86°F, 40-60% storms, humid
