Extreme Heat Warning

Locations Affected

Chicago, IL ∙ Cicero, IL ∙ Evanston, IL ∙ Arlington Heights, IL ∙ Schaumburg, IL ∙ Palatine, IL ∙ Skokie, IL ∙ Orland Park, IL ∙ Tinley Park, IL ∙ Des Plaines, IL

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Chicago IL 350 AM CDT Fri Jun 20 2025 ...EXTREME HEAT WARNING IN EFFECT FROM 10 AM SATURDAY TO 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 of 100 to 105 degrees expected. * WHERE...Central Cook, Northern Cook, and Southern Cook Counties. * WHEN...From 10 AM Saturday to 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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