Extreme Heat Watch issued August 30 at 12:27PM CDT until September 4 at 8:00PM CDT by NWS St Louis MO

Clinton; Washington; Randolph; Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City

Urgency: Future

Certainty: Likely

Onset: 8/31/2026, 5:00:00 PM

Expires: 8/31/2026, 8:30:00 AM

Details

* 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.

What To Do

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.

Affected States

Washington

Other Active Extreme Heat Watch Alerts

Extreme Heat Watch issued August 30 at 12:25PM CDT until September 4 at 8:00PM CDT by NWS Springfield MO

Bourbon; Crawford; Cherokee; Benton; Morgan; Miller; Maries; Vernon; St. Clair; Hickory; Camden; Pulaski; Phelps; Barton; Cedar; Polk; Dallas; Laclede; Texas; Dent; Jasper; Dade; Greene; Webster; Wright; Newton; Lawrence; Christian; Douglas; Howell; Shannon; McDonald; Barry; Stone; Taney; Ozark; Oregon

Extreme Heat Watch issued August 30 at 12:20PM CDT until September 4 at 8:00PM CDT by NWS Paducah KY

Jefferson; Wayne; Edwards; Wabash; Perry; Franklin; Hamilton; White; Jackson; Williamson; Saline; Gallatin; Union; Johnson; Pope; Hardin; Alexander; Pulaski; Massac; Gibson; Pike; Posey; Vanderburgh; Warrick; Spencer; Fulton; Hickman; Carlisle; Ballard; McCracken; Graves; Livingston; Marshall; Calloway; Crittenden; Lyon; Trigg; Caldwell; Union; Webster; Hopkins; Christian; Henderson; Daviess; McLean; Muhlenberg; Todd; Perry; Bollinger; Cape Girardeau; Wayne; Carter; Ripley; Butler; Stoddard; Scott; Mississippi; New Madrid

Source: National Weather Service.