![]() ![]() September and October will be warmer and rainier than normal, on average. The hottest periods will be in mid-July and early and late August. In fact, the average high temperature doesnt peak higher than 80 F (26.7 C) during the hottest days of the. September is the start of autumn in Chicago, with warm and sometimes mild temperatures in the daytime, and cooler evenings after the sun sets. Rainfall will be below normal in the east and near normal in the west. This is 22 F (12 C) warmer than the historical average for Elkwater this time of year. August 29, 2022: Afternoon storms produce damaging winds, including 75+ mph in the Kankakee River Valley. ![]() September 11-12, 2022: 3 to 5' of heavy rainfall produces flash flooding on the north side of Chicago. April will be cooler than normal, while May will be warmer. September 18, 2022: Hail to the size of ping pong balls in Geneva and St. If you want to avoid the crowds of summer, September is a great time of year to visit this vibrant city. ![]() The snowiest periods will be in late November to early December and early to mid-January. September is the start of autumn in Chicago, with warm and sometimes mild temperatures in the daytime, and cooler evenings after the sun sets. The highest temperature recorded during the meteorological winter months of December, January, and February is 75 F (24 C), set on February 27, 1976. Both precipitation and snowfall will be above normal. As the month continues, mornings become chilly, with averages in the 50s. Winter will be colder than normal, with the coldest temperatures in early December and late January to mid-February. From September 15 until the first date when the nighttime outdoor temperature falls below 45F or October 15 (whichever comes first) the indoor temperature. Early September: 79F (26C) Mid-September: 76F (24C) Late September: 69F (20C) Mornings are relatively warm at the beginning of the month, with averages in the low 70s. Enter Your Location Annual Weather Summary ![]()
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