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Severe · Extreme Heat WarningActive alert

Extreme Heat Warning issued September 3 at 1:42PM CDT until September 5

Affecting Iowa; Johnson; Cedar; Muscatine; Scott; Keokuk; Washington; Louisa; Jefferson; Henry; Des Moines; Van Buren; Lee; Rock Island; Mercer; Henderson; Warren; Hancock; McDonough; Scotland; Clark

In effect until: Sep 4, 2026, 2:45 AM

Iowa; Johnson; Cedar; Muscatine; Scott; Keokuk; Washington; Louisa; Jefferson; Henry; Des Moines; Van Buren; Lee; Rock Island; Mercer; Henderson; Warren; Hancock; McDonough; Scotland; Clark

Likely impact; effects through 2:45 AM.

Stay in air conditioning if possible. Drink water regularly and check on elderly neighbors.

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Read the original bulletin (official text)
* WHAT...Dangerously hot conditions with heat index values of 100 to
110.

* WHERE...Portions of northwest and west central Illinois, east
central and southeast Iowa, and northeast Missouri.

* WHEN...Until 7 PM CDT Saturday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™