Extreme heat continues in Chicago on Monday, June 23
CHICAGO, Illinois — A dangerous heat wave remains firmly in place across the Chicago metropolitan area for the third consecutive day this Monday, June 23, with feels-like temperatures soaring up to 105°F (40.5°C) and an extreme heat warning extended across much of Illinois through midnight.
According to NBC 5 Storm Team Meteorologist Alicia Roman, a shift in the weather pattern is expected to arrive overnight, bringing daily chances of thunderstorms and gradually cooler conditions, although the heat will persist for a few more days.
Until the pattern change arrives, heat alerts remain in full force. The National Weather Service (NWS) has kept Chicago and all of Cook County under an extreme heat warning, with humid and oppressive air masses pushing actual temperatures up to 97°F (36.1°C).
Heat worsens overnight in urban core
While daytime highs remain scorching, the heat risk is particularly acute during the overnight hours due to the Urban Heat Island effect, especially in the central districts of Chicago. Temperatures may not drop below 80°F (26.6°C) again tonight, which is higher than the normal daytime highs for late June in northern Illinois.
According to the NWS, this persistent nighttime warmth limits the body’s ability to recover from daytime heat, making conditions especially hazardous for seniors and individuals with pre-existing health issues.
Urban areas like downtown Chicago remain several degrees warmer than the surrounding suburbs and rural regions, as concrete and asphalt radiate the heat they absorbed during the day well into the night.
Relief coming with scattered storms and rain
By late Monday night, the Chicago area will begin to see the first signs of change, as unstable air introduces a chance for scattered showers and isolated thunderstorms moving in from the northwest.
Tuesday, June 24, is forecast to begin mostly dry, but by midday, showers and storms are expected to form, particularly in counties north and west of Chicago. Between 3 p.m. and 5 p.m., the rain is likely to become widespread, stretching into the evening commute and central neighborhoods of the city.
Roman noted this weather setup could become a repeating pattern, with daily rounds of rain and intermittent thunderstorms lasting through the end of the workweek.
As a result, temperatures will begin to ease slightly, staying in the upper 80s to low 90s (31°C to 33°C) through Friday, offering a modest break from the intense heat of the past several days.
