Weather Alerts For Darien, IL

# HEADLINE -------------------- HEAT ADVISORY REMAINS IN EFFECT UNTIL 10 PM CDT WEDNESDAY # DETAILS -------------------- WHAT Heat index values around 105 expected each afternoon WHERE Portions of central, east central, north central, and northeast Illinois and northwest Indiana. WHEN Until 10 PM CDT Wednesday. IMPACTS Hot temperatures and high humidity may cause heat illnesses. ISSUED AT Monday, June 29, 2026 at 10:09 AM CDT ISSUED BY National Weather Service Chicago IL HEADER URGENT - WEATHER MESSAGE # 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. # AREAS AFFECTED -------------------- Benton, Boone, De Kalb, DuPage, Eastern Will, Ford, Grundy, Iroquois, Jasper, Kane, Kankakee, Kendall, La Salle, Lake IL, Lake IN, Lee, Livingston, McHenry, Newton, Northern Will, Ogle, Porter, Southern Will, Winnebago Including the cities of Oswego, Elgin, Rensselaer, Yorkville, Crete, Morocco, Waukegan, Marseilles, Coal City, Algonquin, Downers Grove, Wilmington, Merrillville, Oxford, Gary, La Salle, Gilman, Paxton, Pontiac, Buffalo Grove, Roselawn, DeMotte, Bolingbrook, Dixon, Fowler, Aurora, Hammond, Carol Stream, Woodstock, Crystal Lake, Mokena, Beecher, Wheaton, Gurnee, Kentland, Morris, Bourbonnais, Joliet, Portage, Byron, Lombard, Rockford, Watseka, Manhattan, Oregon, Streator, Valparaiso, Ottawa, Plainfield, Peotone, Gibson City, Rochelle, Fairbury, Naperville, Plano, Mendota, Kankakee, Dwight, Mundelein, McHenry, Belvidere, Bradley, Channahon, DeKalb, Chesterton, Minooka, and Sycamore