Extreme Heat Warning

Locations Affected

Chicago, IL ∙ Naperville, IL ∙ Aurora, IL ∙ Joliet, IL ∙ Rockford, IL ∙ Elgin, IL ∙ Waukegan, IL ∙ Cicero, IL ∙ Schaumburg, IL ∙ Palatine, IL

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Chicago IL 309 PM CDT Wed Jul 1 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT THURSDAY NIGHT... * WHAT...Dangerously hot conditions with peak afternoon heat index values of 100 to 105 degrees expected. * WHERE...Central Cook, Northern Cook, and Southern Cook Counties. * WHEN...Until midnight CDT Thursday Night. * IMPACTS...Heat related illnesses increase during heat waves. 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. 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

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