Heat Advisory Extended for Clinton, Marion, Washington, and Other Illinois and Missouri Counties Until 7 PM CDT
The National Weather Service has extended the Heat Advisory for portions of south central and southwest Illinois and southeast Missouri until 7 PM CDT today, September 9.
4 reports on this incident · first at Sep 9, 2026, 3:48 a.m. ET
Earlier reports
Sep 9, 2026, 4:23 a.m. ET
Heat Advisory for Clinton, Marion, Washington IL and Nearby Areas Until 7 PM CDT
The National Weather Service St Louis MO has issued a Heat Advisory for portions of south central and southwest Illinois and southeast Missouri, effective from noon to 7 PM CDT on September 9, 2026. The advisory covers 11 zones, including Clinton, Marion, Washington, Randolph, Saint Clair, and Monroe counties in Illinois, and Saint Francois, Sainte Genevieve, Iron, Madison, and Reynolds counties in Missouri. Cities in the affected area include Cahokia, Sparta, Centralia, Chester, Farmington, Belleville, and Salem.
Heat index values up to 107 are expected. Hot temperatures and high humidity may cause heat illnesses. The advisory urges residents to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check on relatives and neighbors. Young children and pets should never be left unattended in vehicles. Those who work or spend time outside should take extra precautions, reschedule strenuous activities to early morning or evening, and wear lightweight and loose fitting clothing. The Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments for outdoor work. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency; call 9 1 1.
The advisory expires at 7 PM CDT this evening.
Sep 9, 2026, 3:53 a.m. ET
Heat Advisory for Clinton, Marion, Washington IL: NWS Warns of Heat Illness Risk as Index Reaches 107
The National Weather Service St Louis MO has issued a Heat Advisory for September 9, warning that hot temperatures and high humidity may cause heat illnesses. The advisory starts at noon (12:00 PM CDT) and lasts until 7 PM CDT today, with heat index values up to 107 expected.
The advisory covers portions of south central and southwest Illinois and southeast Missouri, including Clinton, Marion, Washington, Randolph, Saint Clair, Monroe, Sainte Genevieve, Iron, Madison, and Reynolds counties. Cities in the affected area include Cahokia, Sparta, Centralia, Chester, Farmington, Belleville, and Salem.
The Weather Service advises drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking on relatives and neighbors. Young children and pets should never be left unattended in vehicles. Anyone overcome by heat should be moved to a cool and shaded location; heat stroke is an emergency and 9 1 1 should be called.
Sep 9, 2026, 3:48 a.m. ETFirst report
Heat Advisory Issued for Clinton, Marion, and Washington IL Until 7 PM CDT
The National Weather Service in St. Louis has issued a Heat Advisory for portions of south central and southwest Illinois and southeast Missouri, effective from noon to 7 PM CDT on September 9, 2026. The advisory covers 11 counties, including Clinton, Marion, Washington, Randolph, Saint Clair, and Monroe in Illinois, and Saint Francois, Sainte Genevieve, Iron, Madison, and Reynolds in Missouri. Cities affected include Cahokia, Sparta, Centralia, Chester, Farmington, Belleville, and Salem.
Heat index values up to 107 degrees are expected. The advisory warns that hot temperatures and high humidity may cause heat illnesses. The National Weather Service advises drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking on relatives and neighbors. Young children and pets should never be left unattended in vehicles. Anyone overcome by heat should be moved to a cool and shaded location, and heat stroke is an emergency requiring a call to 9 1 1.
The advisory expires at 7 PM CDT this evening.
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Revision history
- Version 19 Sept 2026, 08:28current
First published.
- Version 19 Sept 2026, 07:53current
First published.
- Version 19 Sept 2026, 07:48current
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- Version 19 Sept 2026, 08:23current
First published.
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