NWS St Louis MOXH.W 0004September 3, 2026
Extreme Heat Warning: Greene, Macoupin, Montgomery and 36 more, IL and MO
The National Weather Service office in St Louis issued an extreme heat warning for Greene, Macoupin, Montgomery and 36 more in Illinois, Missouri, which was in force until 8:00 p.m. local time on September 5. It was the 4th extreme heat warning the NWS office in St Louis issued in 2026. Illinois had 5 extreme heat warnings in September 2026, against 0 in an average September of 2008-2025 (Illinois's extreme heat warnings by year).
ExpiredWarning
In force for 3 days; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, St Louis MO
- Area
- Greene, Macoupin, Montgomery and 36 more
- State
- Illinois
- Level
- Warning
- Issued
- 12:12 a.m. CDT, September 3, 2026
- Expires
- 8:00 p.m. CDT, September 5, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Expected
- VTEC event
- KLSX XH.W 0004
- Official source
- National Weather Service: the notice at its source
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
* WHAT...Dangerously hot conditions with heat index values up to 107. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.
What the agency told people to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.