Though Chicago is coming to mid-September, the temperature has unexpectedly got to 90°F on Monday, September 12! Surprisingly, on the following day, September 13, the temperature will drop to around 70°F in the daytime and just about mid 50°F in the night. Then the rest of the week will see the gradual drop of temperatures but a slight increase on Sunday. However, as a Chicagoan, you may be accustomed to that variable and kinda quirky weather, right?

As it's known to all, Chicago's autumn is comparatively short. Starting from this week, the city tends to be a bit chilly and windy in nights. For instance, on Thursday, September 15, the night temperature is predicated to fall to about 49°F! Therefore, if you have night outings this week, remember to take a light jacket in case of the chilly wind.

About chance of precipitation, well, Chicago is, generally, cloudy and sunny for this week, with slight possibility of precipitation on Thursday, September 15. Thus, it seems that this week is perfect for family outings, outdoor events or open-air parties. For your convenience, we offer a weekly weather forecast below for Chicago, September 12 through 18. Discover the exact hourly weather info.