Are you considering a trip to Chicago in September? Well, the weather is usually on your side with an average maximum temperature of +73°F and about 7 sunny days. Just keep in mind that there may be some rain, with an average of 7 rainy days and 72 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Average weather
☀️
+73°F
Avg. max. temperature
+41°F
Min.
+97°F
Max.
72 mm
Total precipitation
67%
Avg. humidity
3 m/s
Avg. wind
7 ☀️
Sunny Days
16 ⛅️
Cloudy
7 🌦
Rainy
Our opinion: Chicago has good weather in September.
Average temperature in Chicago in September
Here are the expected maximum, average and minimum temperatures in Chicago for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +90°F during the day to a minimum of +46°F during the night, the temperature in September averages around +75°F.
The average maximum temperature goes down 62% by the end of the month, compared with the beginning of the month, from +90°F to +63°F.
Is Chicago warm or cold in September?
Chicago is typically warm in September.
Maximum temperatures go up compared to the previous month from +81°F to +73°F. The minimum temperature also goes down from +68°F to +61°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Chicago:
Climate in Chicago in September
Chicago weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+81°F
+73°F
+61°F
Min. temperature
+52°F
+41°F
+28°F
Max. temperature
+97°F
+97°F
+88°F
Rainfall
89 mm
72 mm
79 mm
Wind
3 m/s
3 m/s
3 m/s
Humidity
68%
67%
66%
Air pressure
1015 HPa
1016 HPa
1016 HPa
Sunny days
6
7
6
Cloudy days
17
16
18
Rainy days
8
7
7
Snowy days
0
0
0
September weather is still as good as in August.It’s getting colder in September. From +81°F in the day, the average maximum temperature lowers to +73°F.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 89 mm to 72 mm.It feels drier, as humidity decreases from 68% to 67%.The average wind speed doesn’t change much during September, staying around 3 m/s.The good news is there are likely to be more sunny days in September, from 6 to 7.
October brings much the same weather, it remains good.
Wind speed in Chicago in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Chicago is gradually decreasing during September, going from 3 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Chicago based on historical data.
Last Year
Historical Data
Total precipitation in September is about 110 mm, with a 30% chance of rain on a typical day. The maximum amount of rainfall per day is around 73 mm, which is considered heavy rain.On average, there are about 9 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Chicago wettest month is May, where a typical day has a 29% chance of precipitation and 101 mm of rainfall per day. January, on the other hand, is the driest month with a mere 6% chance of precipitation and 21 mm of rainfall per day.
How was the weather last September in Chicago?
This is the weather in Chicago in September 2023:
1 September
☀️
+90°F
2 September
☁️
+86°F
3 September
☁️
+87°F
4 September
☁️
+73°F
5 September
☁️
+70°F
6 September
☁️
+78°F
7 September
☁️
+78°F
8 September
☀️
+84°F
9 September
☀️
+84°F
10 September
☁️
+84°F
11 September
☁️
+79°F
12 September
☁️
+64°F
13 September
☁️
+74°F
14 September
☀️
+75°F
15 September
☀️
+83°F
16 September
☁️
+84°F
17 September
☁️
+85°F
18 September
☁️
+87°F
19 September
☀️
+82°F
20 September
☁️
+84°F
21 September
☁️
+85°F
22 September
☀️
+75°F
23 September
☁️
+63°F
24 September
🌧️
+71°F
25 September
☁️
+68°F
26 September
☀️
+64°F
27 September
☁️
+58°F
28 September
☁️
+58°F
29 September
☀️
+60°F
30 September
☀️
+63°F
In September 2023 Chicago had 10 sunny days, 19 cloudy days, and 1 rainy days. The average maximum temperature was +75°F, with an absolute maximum of +90°F and a minimum of +57°F. The average humidity was 69%, with a maximum of 94% and a minimum of 39%. The average wind speed was 3 m/s, with a maximum of 15 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Chicago climate has changed over the last 43 years.
The climate in Chicago in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1993 (+68°F) and the highest in 2021 (+82°F). The driest year was 1979 with only 4 mm of rainfall, and the wettest year was 2008 with 357 mm.
FAQ
Frequently asked questions about the weather in Chicago in September:
Is September a good time to visit Chicago?
September is a really good time to go to Chicago. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Chicago.
Can you sunbathe in Chicago in September?
September is warm in Chicago. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Chicago rainy in September?
Chicago is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Chicago in September?
Usually, it’s not very sunny in Chicago in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Chicago, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.