Alex Marin, Sam Medina, Madalyn Delossantos, 11, and Medina's children Leo-Wyatt, 4, and Mikey, 2, cool off with water toys and a sprinkler during a scorching afternoon in Yonkers June 23, 2025. Over the next two days, heat index values are forecasted to reach 107 degrees as a heat wave envelops much of the East Coast.
Alex Marin, Sam Medina, Madalyn Delossantos, 11, and Medina's children Leo-Wyatt, 4, and Mikey, 2, cool off with water toys and a sprinkler during a scorching afternoon in Yonkers June 23, 2025. Over the next two days, heat index values are forecasted to reach 107 degrees as a heat wave envelops much of the East Coast.
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When will it cool off in Illinois? Heat wave may continue for days, forecasts show

The heat wave continues to prevail across Illinois and the majority of the U.S. this week, with heat indexes remaining above 100 degrees in many places.

With several days of heat advisories already under their belt, many Illinoisans wonder when it will cool off.

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Here’s what we know.

When will temperatures cool off in Illinois?

Heat indexes are expected to remain above 100 through the end of the week in northern, central and southern Illinois and possibly the Chicagoland area, according to the National Weather Service.

However, temperatures will likely level out to the mid 80s by Monday, June 30, according to forecasts by the Weather Channel.

Central Illinois daily temperatures

Tuesday: Low of 74, high of 92

Wednesday: Low 74, high of 92

Thursday: Low of 74, high of 94

Friday: Low of 72, high of 89

Saturday: Low of 72, high of 90

Sunday: Low of 72, high of 90

Monday: Low of 69, high of 84

Chicago daily temperatures

Tuesday: Low of 69, high of 93

Wednesday: Low of 70, high of 78

Thursday: Low of 74, high of 91

Friday: Low of 72, high of 88

Saturday: Low of 73, high of 84

Sunday: Low of 72, high of 89

Monday: Low of 69, high of 84

Heat map

This article originally appeared on Journal Star: When will it cool off in Illinois? Heat wave may continue for days, forecasts show

Reporting by Hannah Hudnall, USA TODAY NETWORK / Journal Star

USA TODAY Network via Reuters Connect

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