CHICAGO | An Extreme Heat Warning is active for Chicago and Cook County. CGN News is publishing this alert because official National Weather Service alert data includes Cook County, Illinois.
What is active now
The active alert is an Extreme Heat Warning. The National Weather Service lists the alert with severe heat risk, expected timing and likely certainty. County-specific updates should control immediate safety decisions.
The alert became effective 1 July 2026 at 10:56 AM EDT. The current listed expiration or ending time is 3 July 2026 at 1:00 AM EDT. Warnings can be extended, replaced or cancelled as updated observations and forecasts arrive.
Coverage area
This CGN alert covers Cook County, Illinois. Nearby communities may experience different conditions, and warning boundaries can change quickly.
Safety
Drink water, stay in air conditioning when possible, limit strenuous outdoor activity, check on older adults and people without reliable cooling, and never leave children or pets in unattended vehicles. Outdoor workers should use shade, rest breaks and hydration plans. Chicago residents can use city information services for wellness checks and cooling-center details when available.
What to watch next
Readers should monitor current National Weather Service alerts, NOAA Weather Radio, local emergency management, trusted local broadcasters and official city or county cooling-center information. Do not rely on this article alone for emergency decisions.
Additional Reporting By: National Weather Service; NOAA; National Weather Service Chicago; OSHA Heat Illness Prevention