Categories: Illinois News

Monday: Hottest late season temperature in a half century

NOTE: This article is now an almanac of Monday’s weather. We have published a new forecast story for Tuesday.

The calendar says late September, but late summer warmth isn’t going away just yet.

Monday’s unseasonable 89 degrees at O’Hare and 90 degrees at Midway made this the warmest temperature for this late in the season since 1975 when the mercury peaked at 89 degrees on October 14!

It’s a level nearly 20 degrees above normal and more typical of July.  

Monday: hottest late season temperature in a half century 1
Monday: hottest late season temperature in a half century 2
Monday: hottest late season temperature in a half century 3

Chicago 90 degree scorecard 

We add one to the list at Midway, making this 30 days now for 2025 at or above 90-degrees.  

Monday: hottest late season temperature in a half century 4

Chicago 80 degree scorecard

We’re now at 85 days and 90 days respectively at O’Hare and Midway, and while still behind a year ago, we’ve surpassed the annual normal at both locations. 

Monday: hottest late season temperature in a half century 5

Sunny September 2025

Another 100% sunny day keeping the trend of what’s been a sunny month! 

Monday: hottest late season temperature in a half century 6

Monday peak pollen count

Mold continues to be an issue for allergy sufferers. Note: The folks at Loyola Medicine will stop taking pollen numbers after tomorrow and resume again next spring.   

Monday: hottest late season temperature in a half century 7

Monday U.S. highs and departure from normal

 Summer-level warmth dominated the entire Midwest with highs 15 to 25-degrees above normal across a large area. 

Monday: hottest late season temperature in a half century 8
Monday: hottest late season temperature in a half century 9

Climate and Environment news: WGN Weather Center blog

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