September weather in Berwyn, IL
The average temperature in Berwyn in September is 67.5°F (58.8°F–76.3°F). Average precipitation: 2.77 inches.
September is a fall month in Berwyn, and is warmer than the annual average of 52.1°F. Daily temperatures swing about 17.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.3°F
Avg Low
58.8°F
Precipitation
2.77 in
Daylight
12h 16m
September records in Berwyn
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2000) | 50.0°F (2009) | 0.85 in (2003) |
| September 2 | 95.0°F (2008) | 50.0°F (2017) | 0.92 in (2010) |
| September 3 | 93.0°F (2015) | 52.0°F (1997) | 0.45 in (2018) |
| September 4 | 93.0°F (2018) | 48.9°F (1997) | 2.68 in (2008) |
| September 5 | 93.9°F (1999) | 52.0°F (1997) | 0.43 in (2014) |
| September 6 | 93.9°F (1998) | 50.0°F (2017) | 0.58 in (2001) |
| September 7 | 93.9°F (2016) | 48.9°F (2025) | 1.42 in (1998) |
| September 8 | 93.9°F (2002) | 48.9°F (2024) | 1.01 in (2008) |
| September 9 | 93.9°F (2013) | 48.9°F (2008) | 0.49 in (2001) |
| September 10 | 96.1°F (2013) | 50.0°F (2008) | 1.61 in (2014) |
| September 11 | 91.9°F (2013) | 51.1°F (2007) | 1.40 in (2022) |
| September 12 | 90.0°F (2005) | 46.0°F (2007) | 0.62 in (2008) |
| September 13 | 93.9°F (2005) | 42.1°F (2014) | 3.07 in (2008) |
| September 14 | 88.0°F (2021) | 46.0°F (2014) | 1.75 in (2008) |
| September 15 | 89.1°F (2024) | 42.1°F (2007) | 0.64 in (2004) |
| September 16 | 90.0°F (2024) | 46.9°F (2000) | 0.06 in (2005) |
| September 17 | 91.9°F (2018) | 48.9°F (2014) | 1.20 in (2023) |
| September 18 | 89.1°F (2000) | 48.9°F (2020) | 3.15 in (2015) |
| September 19 | 91.0°F (2000) | 46.9°F (2012) | 0.75 in (2001) |
| September 20 | 95.0°F (2018) | 44.1°F (2006) | 0.69 in (1998) |
| September 21 | 95.0°F (2017) | 46.9°F (2000) | 0.45 in (2019) |
| September 22 | 95.0°F (2017) | 46.0°F (1999) | 0.80 in (2024) |
| September 23 | 95.0°F (2017) | 43.0°F (2012) | 0.71 in (2001) |
| September 24 | 91.9°F (2017) | 42.1°F (2012) | 0.95 in (2024) |
| September 25 | 91.9°F (2017) | 43.0°F (2001) | 0.71 in (2018) |
| September 26 | 93.0°F (2017) | 43.0°F (2000) | 0.90 in (2011) |
| September 27 | 89.1°F (2025) | 46.9°F (2001) | 1.54 in (2019) |
| September 28 | 84.9°F (2013) | 45.0°F (2006) | 1.52 in (1999) |
| September 29 | 90.0°F (2025) | 42.1°F (2003) | 0.80 in (2019) |
| September 30 | 87.1°F (2019) | 42.1°F (2003) | 0.22 in (2016) |