September weather in Chicago, IL
The average temperature in Chicago in September is 66.7°F (60.2°F–73.2°F). Average precipitation: inches.
September is a fall month in Chicago, and is warmer than the annual average of 50.8°F. Daily temperatures swing about 13°F between overnight low and afternoon high. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
73.2°F
Avg Low
60.2°F
Precipitation
in
Daylight
12h 16m
September records in Chicago
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2011) | 57.9°F (2017) | — |
| September 2 | 96.1°F (2011) | 55.9°F (2021) | — |
| September 3 | 90.0°F (2015) | 59.0°F (2025) | — |
| September 4 | 93.9°F (2007) | 55.9°F (2010) | — |
| September 5 | 93.0°F (2007) | 57.0°F (2017) | — |
| September 6 | 91.9°F (2015) | 52.0°F (2017) | — |
| September 7 | 91.9°F (2016) | 51.1°F (2024) | — |
| September 8 | 84.9°F (2015) | 54.0°F (2024) | — |
| September 9 | 93.9°F (2013) | 55.9°F (2008) | — |
| September 10 | 95.0°F (2013) | 54.0°F (2017) | — |
| September 11 | 90.0°F (2005) | 50.0°F (2014) | — |
| September 12 | 90.0°F (2005) | 45.0°F (2014) | — |
| September 13 | 91.9°F (2005) | 43.0°F (2014) | — |
| September 14 | 84.9°F (2018) | 50.0°F (2014) | — |
| September 15 | 82.0°F (2015) | 48.0°F (2007) | — |
| September 16 | 87.1°F (2017) | 50.0°F (2014) | — |
| September 17 | 88.0°F (2021) | 52.0°F (2014) | — |
| September 18 | 90.0°F (2007) | 51.1°F (2012) | — |
| September 19 | 87.1°F (2007) | 48.0°F (2020) | — |
| September 20 | 91.9°F (2018) | 48.0°F (2006) | — |
| September 21 | 91.0°F (2007) | 51.1°F (2006) | — |
| September 22 | 90.0°F (2017) | 48.0°F (2012) | — |
| September 23 | 91.0°F (2010) | 46.9°F (2012) | — |
| September 24 | 91.9°F (2007) | 46.0°F (2012) | — |
| September 25 | 84.9°F (2007) | 52.0°F (2006) | — |
| September 26 | 90.0°F (2017) | 53.1°F (2018) | — |
| September 27 | 86.0°F (2025) | 48.9°F (2022) | — |
| September 28 | 82.9°F (2013) | 48.9°F (2022) | — |
| September 29 | 82.0°F (2007) | 46.9°F (2018) | — |
| September 30 | 86.0°F (2019) | 50.0°F (2005) | — |