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Chicago weather forecast
Archived — this story has rotated out of today’s deck. It is kept here in full.
The gist
Chicago endured a heat advisory for a fourth day on Sep 4, 2026, with highs near 96°F. The prolonged heat wave signals a hotter-than-usual early September for residents.
Background
Chicago has been under a heat-related advisory every day since Tuesday, Sep 1, when the temperature at O'Hare Airport peaked at 95 degrees. Wednesday's recorded high was 96 degrees, and Thursday's was 91 degrees. The heat index on Friday could rise to 105-110 degrees in Will County and parts of DuPage County, according to the National Weather Service.
How it unfolded
- Sep 1, 2026Temperature at O'Hare Airport peaked at 95 degrees, starting the heat advisory.
- Sep 2, 2026Heat advisory issued for second day; Wednesday's high was 96 degrees.
- Sep 3, 2026Extreme heat warning canceled, but advisory continues; Thursday's high was 91 degrees.
- Sep 4, 2026Chicago under heat warning for fourth day; heat index could reach 105-110 in some counties.
Who’s saying what
- Official
- National Weather Service warns of dangerous heat index values up to 110 degrees in some areas.