Illinois, Missouri Moderate Heat Advisory | Effective 08/30/2026 21:03

Headline: 
Heat Advisory issued August 30 at 11:03PM CDT until September 4 at 8:00PM CDT by NWS St Louis MO
Event: 
Heat Advisory
Urgency: 
Expected
Effective: 
August 30, 2026 - 9:03pm
Expires: 
August 31, 2026 - 12:15pm
Description: 
* WHAT...Heat index values up to 105 expected. * 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 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; Marion; 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