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Official 90º tally is on par with last year’s total and what’s typical by July 11—but the mercury has yet to reach the hot 90° weather benchmark so far this month at O’Hare

Since records began 66 years ago at O’Hare, only 14 other years have failed to reach 90+ degrees the first 11 days of July.  A typical FULL July sees about eight 90 degree or warmer days. 

Heat and humidity build over the weekend and continue through Tuesday…

Sunday forecast highs: 

• 260 million residents forecast to see high temperatures at or above 90 degrees  
• 26 million residents to see high temperatures at or above 100 degrees  

FORECAST CHICAGO PEAK AFTERNOON HEAT INDICES:

Monday forecast highs:

• 261 million residents predicted to see high temperatures at or above 90 degrees 
• 27 million residents to swelter in triple digit temperatures   

Tuesday forecast highs:

• 251 million residents predicted to reach 90 degrees or warmer 
• 36 million to swelter in stifling 100 degree or warmer temperatures 

As a prod of the intense heat moves east into the Midwest, there’s also the risk for strong or severe thunderstorms

The Chicago area sits in a risk for possible severe weather Saturday night, Sunday night and again Monday night. 

Timing will be better defined in coming days.  

Saturday severe risk 

Sunday severe risk 

Monday severe risk

Timing the Chicago area’s shower and thunderstorm chances 

Best coverage for scattered showers and thunderstorms Saturday night/Sunday morning then again Sunday night/Monday morning

Cooler pattern follows brief spell of heat as steering winds blow from the northwest out of Canada  

Temperatures to average about 4 degrees below normal across the Chicago area during the July 18-24 period 

Source: weathermodels.com

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WGN-TV Tom Skilling Weather Center

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