NWS St Louis MOXH.W 0004September 3, 2026
Extreme Heat Warning: Madison, St. Clair, Monroe and 4 more, IL and MO
The National Weather Service office in St Louis issued an extreme heat warning for Madison, St. Clair, Monroe and 4 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
- Madison, St. Clair, Monroe and 4 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
Extreme Heat Warnings in Illinois since 2008Every warning type in Illinois
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 110. * WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. * 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
People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668.
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.