Forecast: 90 degrees by lunchtime in Chicago

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Classes begin today in Chicago and the end of summer is near, but this week promises to deliver some of the year’s hottest temperatures.

Highs in the 90s are predicted today and Tuesday with humidity potentially pushing the heat index into the 100s, according to the National Weather Service. There’s a good chance temperatures both days will approach the record highs of 97, both set in 1973. Tuesday looks like the hottest of the two days.

Sunday was the third straight day Chicago got 100 percent of its possible sunshine, according to Chicago climatologist Frank Wachowski. Temperatures reached 89 degrees at O’Hare International Airport.

According to, Chicago has had seven 90-degree days this summer, including four straight on July 16-19. The year’s warmest temperature was 96 on July 19, according to National Weather Service records.

After things cool down a bit with some rain on Wednesday and Thursday, the forecast for the Labor Day weekend includes the possibility of more heat.

For a list of Chicago cooling centers, click here.

–Chicago Tribune staff report

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