Illinois, Missouri Moderate Heat Advisory | Effective 08/31/2026 12:29

Headline: 
Heat Advisory issued August 31 at 2:29PM CDT until September 4 at 8:00PM CDT by NWS St Louis MO
Event: 
Heat Advisory
Urgency: 
Expected
Effective: 
August 31, 2026 - 12:29pm
Expires: 
September 1, 2026 - 6:30am
Description: 
* WHAT...Heat index values up to 105. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
Instruction: 
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.
Area Description: 
Greene; Macoupin; Montgomery; Bond; Fayette; Clinton; Marion; Washington; Randolph; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Boone; Audrain; Moniteau; Cole; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; Franklin; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds
Forcast Office: 
NWS St Louis MO
Sender: 
w-nws.webmaster@noaa.gov