Averages for Chicago in September

September in Chicago is autumn in the city, which means the weather is still pleasant but more mild than it is during the summer.

The milder temperatures also mean that the tourists tend to empty out of the city in this month, so it is a perfect time to enjoy sight seeing without the excessive crowds and queues.

It would be advisable to carry with you a warmer jacket or jumper, though, as the evenings especially can get quite cool.

The average daily temperature for Chicago...

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Averages for Chicago in September

  Temperature 18°C

65°F

Low Temperature 12°C

54°F

  High Temperature 24°C

75°F

  Sunshine Hours 9 hrs
  Chance of Sunny Day 50 %
  Rainfall 90mm
  Rainfall days 10 days
  Chance of Cloudy Day 33 %
Chance of Windy Day 67 %
  Chance of Fog Day 17%
  Chance of Snow Day 33%

Averages for Chicago in September

September in Chicago is autumn in the city, which means the weather is still pleasant but more mild than it is during the summer.

The milder temperatures also mean that the tourists tend to empty out of the city in this month, so it is a perfect time to enjoy sight seeing without the excessive crowds and queues.

It would be advisable to carry with you a warmer jacket or jumper, though, as the evenings especially can get quite cool.

The average daily temperature for Chicago in September is still warm at 24C, but this can still drop down to 12C on average.

The long, hot days of summer are getting shorter in September, with an average of 8 hours of sun per day in September.

The average rainfall experienced in Chicago during this month drops to 90 mm throughout the month on average.


Football season kicks off again in September, with both the National Football League and College Football seasons starting in this month in Chicago.

As well as this, September sees SuperSibs Golf Classic, which is a day of golf, drinks, dinner and an auction in aid of children with cancer.

It is also the month that the world's largest jazz festival comes to town, with the Chicago Jazz Festival featuring jazz musicians from all over the world. Entry is free for any jazz lovers that want to attend this.

There is also the County Fair, that holds all the fun of the fair, with pie eating contests, home made goods on sale, face painting, live music, pony rides and garden demonstrations.

Mexican Independence Day is celebrated with the 26th Street Mexican Independence Day Parade, with the chance to purchase Mexican food and merchandise.

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