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Chicago weather: Brief midweek cool-down before 90s return late this week

By and Dominic Cannonito
Published  August 11, 2025 7:24pm CDT
Weather
FOX 32 Chicago
Chicago Weather: Brief midweek cool-down before 90s return late this week

Chicago Weather: Brief midweek cool-down before 90s return late this week

Fox 32 Chief Meteorologist Emily Wahls has the forecast for Aug. 11, 2025.

The Brief

    • Showers and thunderstorms are moving into Illinois from the southwest during Monday night that are capable of sporadic flashes of lightning.
    • Most areas will dry out by Wednesday morning and seasonal temps plus low humidity will create a beautiful stretch of days leading into the weekend.
    • Friday begins another heat wave with Saturday flirting with heat indices in the 100s.

CHICAGO - UPDATE: A Flood Advisory was issued for portions of Cook, DuPage and far northern Will counties.

Flooding caused by excessive rainfall is expected. Flooding may occur in poor drainage and urban areas including underpasses, roads and streets.

The main threat through Wednesday morning will be isolated thunderstorms on Tuesday between 3 p.m. - 8 p.m. 

Some storms may produce brief downpours as high as an inch of total rainfall specifically east of I-55. 

Chicago Weather Forecast 

What to Expect :

Aside from the storm threat, Tuesday will be partly cloudy throughout the day with temps climbing into the mid-80s plus high humidity. 

Wednesday ushers in refreshing weather in the low to mid 80s with much lower humidity than we have gotten so used to this summer. 

Thursday may even be a touch cooler, only climbing into the low 80s for most, but accompanied by ample sunshine. 

On Friday afternoon the weather shifts back towards southwesterly flow, which brings back the upper 80s and low 90s for most of the Chicagoland area. 

On Saturday the humidity will build, resulting in heat indices close to 100 degrees once again with the high temps in the mid-90s. 

There is still some uncertainty when our next storm maker swings through, but currently, we are expecting a cold front to bring the best chances for showers and thunderstorms on Sunday. 

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