Alert archive / Illinois / Heat Advisories

Heat Advisories in Illinois, 2026

50 heat advisories in 2026. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of heat advisories reaches back to 2005.

Heat Advisories by county

Each county as a circle sized by its count in 2026. Tap one for its archive.

Heat Advisories: 50
Busiest month: July19 heat advisories
Busiest day: August 9, 20265 heat advisories

Over time

By month

The alerts

Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Counties	Lasted
Jun 8, 11:44 AM CDT	Heat Advisory	LSX	Adams, Brown, Calhoun, Clinton, Jersey, Madison and 5 more	32 hr
Jun 8, 1:52 PM CDT	Heat Advisory	PAH	Alexander, Jackson, Perry, Pulaski, Union	30 hr
Jun 9, 2:00 AM CDT	Heat Advisory	DVN	Hancock, Henderson, McDonough, Mercer, Warren	18 hr
Jun 27, 1:59 AM CDT	Heat Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 8 more	71 hr
Jun 27, 11:00 AM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	33 hr
Jun 27, 11:14 AM CDT	Heat Advisory	ILX	Cass, Christian, Clay, Crawford, Cumberland, Effingham and 18 more	32 hr
Jun 28, 2:13 AM CDT	Heat Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 29 more	46 hr
Jun 28, 2:47 AM CDT	Heat Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 11 more	47 hr
Jul 2, 10:16 AM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	58 hr
Jul 2, 11:50 AM CDT	Heat Advisory	LSX	Adams, Bond, Brown, Calhoun, Fayette, Greene and 5 more	54 hr
Jul 2, 11:44 PM CDT	Heat Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 26 more	43 hr
Jul 3, 8:59 AM CDT	Heat Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	10 hr
Jul 14, 12:54 PM CDT	Heat Advisory	DVN	Carroll, Jo Daviess, Stephenson	31 hr
Jul 17, 11:01 AM CDT	Heat Advisory	LSX	Adams, Calhoun, Clinton, Madison, Monroe, Pike and 3 more	4 days
Jul 17, 11:01 AM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 12 more	4 days
Jul 17, 12:32 PM CDT	Heat Advisory	DVN	Hancock, Henderson, McDonough, Mercer, Rock Island, Warren	30 hr
Jul 19, 11:56 AM CDT	Heat Advisory	DVN	Hancock, Henderson	32 hr
Jul 24, 12:15 PM CDT	Heat Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	47 hr
Jul 24, 12:18 PM CDT	Heat Advisory	PAH	Alexander, Franklin, Jackson, Jefferson, Johnson, Massac and 5 more	35 hr
Jul 24, 1:31 PM CDT	Heat Advisory	ILX	Cass, Christian, Clay, DeWitt, Effingham, Fulton and 19 more	61 hr
Jul 25, 2:49 AM CDT	Heat Advisory	DVN	Bureau, Carroll, Jo Daviess, Putnam, Stephenson, Whiteside	47 hr
Jul 25, 1:04 PM CDT	Heat Advisory	LOT	Boone, LaSalle, Lee, Livingston, Ogle, Winnebago	31 hr
Jul 25, 11:44 PM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	25 hr
Jul 27, 12:32 AM CDT	Heat Advisory	PAH	Edwards, Gallatin, Hamilton, Jefferson, Saline, Wabash and 2 more	42 hr
Jul 27, 2:02 AM CDT	Heat Advisory	ILX	Clark, Edgar, Vermilion	9 hr
Jul 27, 2:10 AM CDT	Heat Advisory	LOT	Boone, Cook, DuPage, Iroquois, Kane, Kankakee and 4 more	14 hr
Jul 27, 12:14 PM CDT	Heat Advisory	LSX	Bond, Clinton, Madison, Marion	31 hr
Aug 9, 12:29 AM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	4 days
Aug 9, 1:05 AM CDT	Heat Advisory	LSX	Adams, Bond, Brown, Calhoun, Fayette, Greene and 5 more	8 days
Aug 9, 1:41 AM CDT	Heat Advisory	DVN	Hancock, Henderson, Henry, McDonough, Mercer, Rock Island and 1 more	18 hr
Aug 9, 2:03 AM CDT	Heat Advisory	ILX	Cass, Fulton, Knox, Mason, Menard, Morgan and 3 more	17 hr
Aug 9, 2:03 AM CDT	Heat Advisory	ILX	Cass, Christian, Clark, Clay, Crawford, Cumberland and 12 more	41 hr
Aug 10, 1:57 PM CDT	Heat Advisory	DVN	Hancock, Henderson, McDonough, Mercer, Warren	30 hr
Aug 10, 2:34 PM CDT	Heat Advisory	ILX	Cass, Christian, Clark, Clay, Coles, Crawford and 16 more	29 hr
Aug 12, 1:18 AM CDT	Heat Advisory	DVN	Hancock, Henderson, McDonough, Warren	12 hr
Aug 12, 1:59 AM CDT	Heat Advisory	ILX	Cass, Christian, Clay, Crawford, Effingham, Jasper and 7 more	18 hr
Aug 13, 12:32 AM CDT	Heat Advisory	ILX	Christian, Clark, Clay, Crawford, Cumberland, Effingham and 7 more	4 days
Aug 30, 12:20 PM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	47 hr
Aug 30, 12:23 PM CDT	Heat Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 29 more	71 hr
Aug 30, 12:27 PM CDT	Heat Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	3 days
Aug 30, 1:04 PM CDT	Heat Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	6 days
Aug 31, 12:24 PM CDT	Heat Advisory	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	33 hr
Aug 31, 12:24 PM CDT	Heat Advisory	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	3 days
Sep 3, 7:56 PM CDT	Heat Advisory	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	25 hr
Sep 5, 11:11 AM CDT	Heat Advisory	LOT	Ford, Iroquois, Livingston	7 hr
Sep 8, 12:44 PM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	30 hr
Sep 9, 2:40 AM CDT	Heat Advisory	LSX	Clinton, Marion, Monroe, Randolph, Saint Clair, Washington	16 hr
Sep 13, 11:12 AM CDT	Heat Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	7 days
Sep 14, 11:30 AM CDT	Heat Advisory	LSX	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	5 days
Sep 16, 12:20 PM CDT	Heat Advisory	ILX	Christian, Clay, Crawford, Cumberland, Effingham, Jasper and 6 more	31 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

62 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2025

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.