Weather Alerts For Summit Argo, IL

# HEADLINE -------------------- EXTREME HEAT WATCH REMAINS IN EFFECT FROM MONDAY AFTERNOON THROUGH WEDNESDAY EVENING # DETAILS -------------------- WHAT Dangerously hot conditions with heat index values around 105 possible each afternoon. WHERE Central Cook, Northern Cook, and Southern Cook Counties. WHEN From Monday afternoon through Wednesday evening. IMPACTS Heat related illnesses increase significantly during extreme heat and high humidity events. ISSUED AT Sunday, June 28, 2026 at 2:47 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 -------------------- Central Cook, Northern Cook, Southern Cook Including the cities of Cicero, Palatine, Oak Lawn, Oak Forest, Oak Park, La Grange, Des Plaines, Northbrook, Calumet City, Evanston, Orland Park, Chicago, Schaumburg, Lemont, and Park Forest