Severe · Extreme Heat WarningActive alert
Extreme Heat Warning issued September 3 at 10:14AM CDT until September 3
Affecting Southern Cook
In effect until: Sep 4, 2026, 12:00 AM
Southern Cook
Likely impact; effects through 12:00 AM.
Stay in air conditioning if possible. Drink water regularly and check on elderly neighbors.
Read the original bulletin (official text)
* WHAT...Dangerously hot conditions with heat index values of 100 to 105 expected. This is the third day in a row with a forecast or observed maximum heat index over 100 degrees. * WHERE...Southern Cook County. * WHEN...Until 7 PM CDT this evening. * IMPACTS...The threat for heat related illnesses increases significantly during prolonged periods of hot temperatures and high humidity levels. * ADDITIONAL DETAILS...A cold front possibly accompanied by thunderstorms will move inland from Lake Michigan this afternoon and evening leading to rapidly improving conditions.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™