Heat Advisory
Status
Event Continued Active alertStart Time
Mon 07/27/2026 04:02 AM EDTEnd Time
Mon 07/27/2026 10:00 PM EDTSignificance
AdvisoryImpacts
Low impact
Locations Affected
Chicago, IL ∙ Aurora, IL ∙ Joliet, IL ∙ Naperville, IL ∙ Elgin, IL ∙ Waukegan, IL ∙ Cicero, IL ∙ Arlington Heights, IL ∙ Bolingbrook, IL ∙ Evanston, ILFull Alert Message
URGENT - WEATHER MESSAGE National Weather Service Chicago IL 302 AM CDT Mon Jul 27 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT /10 PM EDT/ THIS EVENING... * WHAT...Peak heat index values up to 100 to 110 degrees expected. * WHERE...Portions of east central and northeast Illinois and northwest Indiana. * WHEN...Until 9 PM CDT /10 PM EDT/ this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Technical Header
ILZ006-013-023-033-103>108-INZ001-010-011-019-271815- /O.CON.KLOT.HT.Y.0004.000000T0000Z-260728T0200Z/ Lake IL-DuPage-Kankakee-Iroquois-Northern Cook-Central Cook- Southern Cook-Northern Will-Southern Will-Eastern Will-Lake IN- Newton-Jasper-Benton- Including the cities of Chicago, Cicero, Oak Park, Merrillville, Bolingbrook, Oak Forest, Schaumburg, Hammond, Joliet, Northbrook, Lemont, Calumet City, Fowler, Mokena, Carol Stream, Mundelein, Orland Park, DeMotte, Waukegan, La Grange, Park Forest, Channahon, Watseka, Gilman, Naperville, Kentland, Wheaton, Bradley, Bourbonnais, Plainfield, Evanston, Crete, Morocco, Rensselaer, Downers Grove, Peotone, Oxford, Buffalo Grove, Gurnee, Manhattan, Roselawn, Wilmington, Kankakee, Oak Lawn, Beecher, Gary, Lombard, Palatine, and Des Plaines 302 AM CDT Mon Jul 27 2026 /402 AM EDT Mon Jul 27 2026/
