This Is When Fall Will Arrive In Illinois This Year, Forecasters Say

ILLINOIS — If you're ready for the crisp, cool weather of autumn, Chicago area residents will be happy to see the newly released fall forecast from Accuweather.

Summer warmth and humidity are expected to persist across the eastern United States through the start of autumn. However, that won't be the case for northern Illinois.

"The cold air will first arrive and be most pronounced in North Dakota, South Dakota, Minnesota, Iowa, Wisconsin, Illinois and Michigan," Accuweather said in a forecast released on Wednesday.

Meteorological fall starts on Monday, Sept. 1, while astronomical autumn starts on the equinox at 1:19 p.m. on Monday, Sept. 22.

Illinois will also have a moderate severe weather risk for September through November. Fall is the second severe weather season, only behind spring, AccuWeather noted.

AccuWeather has also predicted an active Atlantic hurricane season, with 13-18 named storms, including seven to 10 hurricanes, three to five major hurricanes, and three to six direct impacts to the United States.

Tropical storms will be fueled by abnormally warm waters, which could cause hurricanes to potentially rapidly intensify near coastal cities from late summer into autumn.

"Development can be quick, as they tend to form near land over the Southwest Atlantic, Gulf and Caribbean, giving short time to prepare, rather than farther out over the Atlantic," AccuWeather lead hurricane expert Alex DaSilva said.

The 2025 hurricane season began on June 1 and will end on Nov. 30.

For Illinoisans looking forward to those first flakes of snow, AccuWeather is predicting the first possible measurable snow sometime in late November to early December.

"It will be a slow start to the lake-effect snow season in the Great Lakes, but some areas could receive measurable snow in November," AccuWeather said.