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Jefferson County
Sunday September 13th, 2026 :: 11:13 a.m. CDT

Advisory

Heat Advisory until 08:00PM Tuesday

* WHAT...High temperatures in the mid to upper 90s, with stifling humidity creating Peak Heat Index values up to around 105 degrees.

* WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri.

* WHEN...From 11 AM CDT /noon EDT/ to 8 PM CDT /9 PM EDT/ Tuesday.

* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

* AFFECTED AREAS: JEFFERSON ... WAYNE ... EDWARDS ... WABASH ... PERRY ... FRANKLIN ... HAMILTON ... WHITE ... JACKSON ... WILLIAMSON ... SALINE ... GALLATIN ... UNION ... JOHNSON ... POPE ... HARDIN ... ALEXANDER ... PULASKI ... MASSAC ... GIBSON ... PIKE ... POSEY ... VANDERBURGH ... WARRICK ... SPENCER ... HICKMAN ... CARLISLE ... BALLARD ... MCCRACKEN ... GRAVES ... LIVINGSTON ... MARSHALL ... CALLOWAY ... CRITTENDEN ... LYON ... TRIGG ... CALDWELL ... UNION ... WEBSTER ... HOPKINS ... CHRISTIAN ... HENDERSON ... DAVIESS ... MCLEAN ... MUHLENBERG ... TODD ... PERRY ... BOLLINGER ... CAPE GIRARDEAU ... WAYNE ... SCOTT ... MISSISSIPPI

Instructions:

Drink plenty of fluids, stay in an air-conditioned room, 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

Alert Details

Severity:
Moderate - Possible threat to life or property
Urgency:
Expected - Responsive action SHOULD be taken soon (within next hour)
Certainty:
Likely (p > ~50%)
Category:
Meteorological (inc. flood)
Event:
Heat Advisory

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