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Jefferson County
Saturday June 27th, 2026 :: 11:22 a.m. CDT

Advisory

Extreme Heat Watch

...EXTREME HEAT WATCH IN EFFECT FROM MONDAY MORNING THROUGH THURSDAY EVENING... * WHAT...Dangerously hot conditions with heat index values of 105 to 110 possible. * WHERE...Portions of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...from Monday morning through Thursday evening. * IMPACTS...Heat-related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...A prolonged period of dangerous heat and humidity is expected this coming week. This heatwave may linger into the 4th of July weekend. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, and stay out of the sun, and check up on relatives and neighbors.

Address/Location
Jefferson County
100 S 10th St
Mount Vernon, IL 62864

Contact
Emergency: 9-1-1
Non-emergencies: 618-244-8000

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