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Chicago weather: Extreme Heat Warning to take effect this weekend

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Published  June 20, 2025 4:59am CDT
Weather Forecast
FOX 32 Chicago

The Brief

    • An Extreme Heat Warning is in effect for Cook County starting Saturday morning, with temperatures climbing into the upper 90s and heat index values topping 100 through Monday.
    • A Heat Advisory is in place for surrounding counties, with a chance of rain returning Tuesday to bring slight relief.

Extreme Heat Warning

What we know:

CHICAGO - Tomorrow will be mostly sunny with a high in the mid 90s. On Sunday it will be sunny with a high in the mid to upper 90s. Monday will be sunny with a high in the upper 90s. On all three days there will be enough humidity to send the heat index well above 100° during the afternoon. Because of that, an Extreme Heat Warning has been posted for Cook County from 10 a.m. Saturday until Tuesday.

Chicago's Office of Emergency Management and Communications will hold a press conference at 9:30 a.m. on Friday to prepare residents for the dangerously hot conditions. That briefing will be live-streamed in the media player at the top of this story.

A Heat Advisory is in effect for the surrounding counties until Tuesday.

Our next chance of rain will arrive Tuesday afternoon as unsettled weather tempers the heat by a few degrees. The showery/stormy pattern will continue through Thursday with highs in the upper 80s to low 90s.

The Source: The information in this report came from FOX 32 Meteorologist Mike Caplan and the National Weather Service.

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