CHICAGO | An active Extreme Heat Warning is in effect for Chicago and Cook County. CGN News is publishing this alert because official National Weather Service alert data includes one or more CGN coverage areas: Cook County, Illinois.
What is active now
The primary active alert is Extreme Heat Warning with NWS severity listed as Severe, urgency listed as Expected and certainty listed as Likely.
The alert became effective 29 June 2026 at 3:02 AM EDT. The current listed expiration or ending time is 1 July 2026 at 11:00 PM EDT. Readers should rely on the latest county-specific National Weather Service alert before making safety decisions.
Current official alerts
Extreme Heat Warning: NWS lists the affected area as Northern Cook; Central Cook; Southern Cook. Current listed expiration or ending time: 1 July 2026 at 11:00 PM EDT.
Coverage area
This CGN alert covers Cook County, Illinois. Nearby communities may experience different conditions, and warnings can change quickly.
Safety
Limit strenuous outdoor activity, drink water, check on older adults and people without reliable cooling, and never leave children or pets in vehicles. Outdoor workers should use shade, rest breaks and hydration plans.
Official instruction
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.
This alert should be updated if the National Weather Service issues, cancels, extends or replaces the active alert. Do not rely on this article alone for emergency decisions. Keep wireless emergency alerts enabled and monitor official NWS, NOAA, local emergency management and trusted local broadcast sources.
Additional Reporting By: National Weather Service; NOAA; National Weather Service Chicago