Chicago, Illinois – Brutal heat and dangerous humidity are surging across Illinois, putting residents at risk for heat-related illness and sudden storms as the state faces its hottest stretch of the summer so far.
According to the National Weather Service in Chicago, a hazardous heat wave will grip the region from Monday morning through Tuesday night, with peak heat indices reaching 100–110°F away from Lake Michigan. Cities from Joliet to Rockford and Ottawa will see the worst impacts, while Chicago’s urban core and outlying suburbs are under a heat advisory. Scattered morning thunderstorms could briefly limit the heat but may bring damaging wind gusts—especially along the I-55 and I-57 corridors.
Afternoon highs will soar into the mid-90s, with oppressive humidity making it feel even hotter. Local agencies urge everyone to stay hydrated, avoid non-essential outdoor activities, and seek air-conditioned spaces. Power outages and road closures are possible if storms intensify. Dangerous swim conditions continue along Lake Michigan beaches through Thursday, so beachgoers should heed all posted warnings.
With the heat and storms expected to linger into midweek, officials warn this event could rival past heat emergencies. Stay tuned for new advisories and be prepared to alter plans as the situation develops. Warnings and watches remain in effect through Wednesday, with updates likely as new data arrives.
Five-Day Illinois Bullet Forecast
- Tonight: Scattered storms mainly west of Fox Valley. Lows 71–76°F.
- Monday: Very humid, morning storms possible. Highs 90–94°F. Heat index up to 110°F. Lows 74–76°F.
- Tuesday: Humid, storms possible. Highs 88–92°F (locally higher with fewer storms). Heat index up to 110°F. Lows 68–73°F.
- Wednesday: Scattered PM storms, dangerous swim conditions. Highs 77–86°F. Lows 59–68°F.
- Thursday: Less humid, dangerous swim conditions continue. Highs 74–78°F. Lows 55–66°F.
Stay alert for updates from the National Weather Service as conditions change.
