⚠️ Extreme Heat Watch – Madison; St. Clair; Monroe; St. Charles; St. Louis; St. Louis City; Jefferson – Saturday, June 27, 2026

Extreme Heat Watch issued June 27 at 1:59AM CDT until July 3 at 12:00AM CDT by NWS St Louis MO

Details

* WHAT…Dangerously hot conditions with heat index values of 105 to
110 possible.

* 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…From Sunday afternoon through Thursday evening.

* IMPACTS…Heat related illnesses increase significantly during
extreme heat and high humidity events.

Instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

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