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

Extreme Heat Warning issued June 27 at 1:15PM CDT until July 3 at 12:00AM CDT by NWS St Louis MO

Details

* WHAT…Dangerously hot conditions with heat index values up to
around 110 expected.

* 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 noon Sunday to midnight CDT Thursday Night.

* 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. 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.

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