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

Greene; Macoupin; Montgomery; Bond; Fayette; Marion; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Boone; Audrain; Moniteau; Cole; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; Franklin; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds

Urgency: Expected

Certainty: Likely

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

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

Details

* WHAT...Heat index values of 100 to 105 expected, with morning low temperatures of 70 to 78 degrees, for several consecutive days. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...From noon Monday to 8 PM CDT Friday. * IMPACTS...Hot temperatures and moderate humidity may cause heat illnesses.

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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

Affected States

Washington

Other Active Heat Advisory Alerts

Heat Advisory issued August 30 at 1:32PM CDT until September 2 at 7:00PM CDT by NWS Des Moines IA

Dallas; Polk; Jasper; Poweshiek; Madison; Warren; Marion; Mahaska; Union; Clarke; Lucas; Monroe; Wapello; Ringgold; Decatur; Wayne; Appanoose; Davis

Heat Advisory issued August 30 at 1:06PM CDT until August 30 at 7:00PM CDT by NWS Norman OK

Harper; Woods; Alfalfa; Grant; Kay; Woodward; Major; Garfield; Noble; Blaine; Kingfisher; Logan; Payne

Heat Advisory issued August 30 at 1:04PM CDT until September 2 at 7:00PM CDT by NWS Quad Cities IA IL

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

Heat Advisory issued August 30 at 12:55PM CDT until September 2 at 7:00PM CDT by NWS Kansas City/Pleasant Hill MO

Atchison; Miami; Linn; Doniphan; Leavenworth; Wyandotte; Johnson; Worth; Gentry; Harrison; Mercer; Putnam; Schuyler; Andrew; De Kalb; Daviess; Grundy; Sullivan; Adair; Buchanan; Clinton; Caldwell; Livingston; Linn; Macon; Platte; Clay; Ray; Carroll; Chariton; Randolph; Jackson; Lafayette; Saline; Howard; Cass; Johnson; Pettis; Cooper; Bates; Henry

Heat Advisory issued August 30 at 12:34PM CDT until August 31 at 8:00PM CDT by NWS Memphis TN

Clay; Greene; Craighead; Poinsett; Mississippi; Cross; Crittenden; St. Francis; Lee; Phillips; Dunklin; Pemiscot; DeSoto; Tunica; Tate; Coahoma; Quitman; Panola; Tallahatchie; Lake; Obion; Weakley; Henry; Dyer; Gibson; Lauderdale; Tipton; Haywood; Crockett; Shelby; Fayette

Source: National Weather Service.