Chicago Weather in September: Everything You Need to Know

Plan Your Trip with Confidence

As the summer heat fades and the leaves begin to turn, September is an ideal time to visit Chicago. With its vibrant arts and culture scene, delicious food, and stunning architecture, there's something for everyone in this bustling metropolis. But before you pack your bags, it's essential to know what to expect from the weather in September.

Average Temperatures and Precipitation

In September, Chicago experiences a transitional climate, as the transition from summer to fall. The average temperature ranges from a high of 78°F (24°C) to a low of 68°F (20°C). The city typically receives around 3 inches (76 mm) of rain in September, spread over an average of 10 rainy days.

Historical Weather Data

To get a better understanding of Chicago's weather patterns in September, it's helpful to look at historical data. Over the past 30 years, the average temperature in September has ranged from a low of 57°F (14°C) to a high of 89°F (32°C). The average amount of rain has varied from 0.5 inches (13 mm) to 5.9 inches (150 mm).

What to Expect in September

In early September, you can still expect some warm days, with temperatures in the 70s and 80s (20s and 30s). However, it's not uncommon for temperatures to dip into the 50s (10s) at night. As the month progresses, the days become cooler, and the nights become longer. By the end of September, you can expect temperatures in the 60s and 70s (10s and 20s), with occasional evenings in the 50s (10s). Rain is possible throughout the month, so be sure to pack an umbrella.