Chicago in september: average Weather, Temperature and Climate
Weather in Chicago in september 2025
The weather in Chicago in the month of september comes from statistical datas on the past years. You can view the weather statistics the entire month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather UV index: 6
Weather at 6am
63°F
Clear/Sunny
47% of time
21%
18%
10%
Weather at 12pm
72°F
Clear/Sunny
48% of time
22%
16%
9%
Weather at 6pm
70°F
Clear/Sunny
51% of time
20%
17%
10%
Weather at 3am
65°F
48%
22%
19%
6%
Evolution of daily average temperature and precipitation in Chicago in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Chicago in september.
The climate of Chicago in september is good
The weather in september in Chicago is rather dry (with 6.3in of rainfall over 8 days). The weather is better from the previous month since in august it receives an average of 8.7in of precipitation over 11 days.
The climate good in this location september. The high seasonal norm is 74°F. The seasonal minimum is 63°F. Thus, the mean temperature average on this month of september in Chicago is 68°F. Note that seasonal normals in contrast with those observed in Chicago in september with a maximum record of 90°F in 2021 and a minimum record of 43°F in 2012. You can hope to have about 26 days with temperatures over 65°F, or 87% of time.
In september in Chicago, the days on average last 12:28. Sunrise is at 05:31 and sunset is at 17:59.
With good weather conditions, september is a good time to go in this locality in United States.
Seasonal average climate and temperature of Chicago in september
Check below seasonal norms These datas are generated from the weather statements of the last years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 68°F | ||||
| Highest temperature | 74°F | ||||
| Lowest temperature | 63°F | ||||
| Highest record temperature | 90°F (2021) | ||||
| Lowest record temperature | 43°F (2012) | ||||
| Number of days at +86°F | 1 day(s) (3%) | ||||
| Number of days at +65°F | 26 day(s) (87%) | ||||
| Sea temperature | |||||
| Average sea temperature | 70°F | ||||
| Lowest sea temperature | 64°F | ||||
| Highest sea temperature | 75°F | ||||
| Wind | |||||
| Wind speed | 20km/h | ||||
| Wind temperature | 63°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 6.3in | ||||
| Number of days with rainfall | 8 day(s) (27%) | ||||
| Record daily rainfall | 2.9in (2014) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 82% | ||||
| Visibility | 9.44km | ||||
| Cloud cover | 28% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:31 | ||||
| Time of sunset | 17:59 | ||||
| Length of day | 12:28 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Chicago in september 2024:
68°F to 72°F
65°F to 70°F
61°F to 76°F
63°F to 81°F
68°F to 86°F
65°F to 72°F
54°F to 63°F
54°F to 72°F
61°F to 81°F
65°F to 83°F
68°F to 85°F
70°F to 83°F
70°F to 81°F
70°F to 81°F
72°F to 85°F
70°F to 83°F
65°F to 72°F
65°F to 72°F
65°F to 77°F
72°F to 85°F
70°F to 83°F
70°F to 76°F
63°F to 67°F
65°F to 67°F
63°F to 74°F
61°F to 70°F
65°F to 74°F
65°F to 68°F
67°F to 68°F
67°F to 68°F
Map: other cities in the United States (USA) in september
Cities near Chicago:
| Illinois in september | good weather |
| Wisconsin in september | good weather |
| Indianapolis in september | good weather |
| Detroit in september | good weather |
| Cincinnati in september | good weather |
| St. Louis (Missouri) in september | good weather |
| Louisville (Kentucky) in september | good weather |
| Cleveland in september | good weather |
| Des Moines in september | good weather |
| Missouri in september | good weather |
| Minneapolis (Minnesota) in september | perfect weather |
| Nashville in september | good weather |
Click over cities on the map for information about the weather in september.
Chicago
perfect weather
good
tolerable
bad
very bad
Weather data for Chicago in september:
Weather data for Chicago for september are derived from an average of the weather forecast since 2009 in Chicago. There is a margin of error and these forecasts are to be considered as general information only. The weather in Chicago can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Chicago.