Extreme Heat Warning

Locations Affected

Chicago, IL ∙ Cicero, IL ∙ Schaumburg, IL ∙ Palatine, IL ∙ Evanston, IL ∙ Arlington Heights, IL ∙ Skokie, IL ∙ Hoffman Estates, IL ∙ Mount Prospect, IL ∙ Berwyn, IL

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Chicago IL 859 PM CDT Sat Jun 21 2025 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT MONDAY NIGHT... * WHAT...Dangerously hot and humid conditions with high temperatures each day well into the 90s and peak afternoon heat index values between 100 and 107 degrees expected. * WHERE...Central Cook, Northern Cook, and Southern Cook Counties. * WHEN...Until midnight CDT Monday Night. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. The magnitude of anticipated heat, combined with oppressive warmth at night will lead to hazardous conditions, particularly for the elderly and those with pre-existing health conditions. Residents of the city of Chicago can call 3 1 1 to request well being checks for elderly friends or family members, or for information on finding the nearest cooling center. * ADDITIONAL DETAILS...Heat indices will likely remain in the 90s late into the evening hours with overnight lows possibly struggling to fall much below 80 degrees. 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. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

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