Severe · Extreme Heat WatchThis alert has expired. It is kept for reference.
Extreme Heat Watch issued August 30 at 12:27PM CDT until September 4
Affecting Clinton; Washington; Randolph; Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City
In effect until: Aug 31, 2026, 8:30 AM
Clinton; Washington; Randolph; Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City
Likely impact; effects through 8:30 AM.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Monitor the latest forecasts and warnings for updates.
Read the original bulletin (official text)
* WHAT...Dangerously hot conditions with heat index values of 102 to 108 degrees, and morning lows from 75 to 80 degrees, possible for several consecutive days. * WHERE...In Illinois, Clinton IL, Washington IL, Madison IL, Monroe IL, Randolph IL, and Saint Clair IL Counties. In Missouri, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. * WHEN...From Monday afternoon through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...In addition to near-record afternoon temperatures, warm morning lows may provide little relief, especially Wednesday through Friday.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™