⚠️ Extreme Heat Warning – Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City; Jefferson – Thursday, September 3, 2026

Extreme Heat Warning issued September 3 at 12:12AM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

Details

* 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.

Instructions

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.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.