September weather in De Soto, IL
The average temperature in De Soto in September is 68.3°F (55.7°F–80.8°F). Average precipitation: 2.85 inches.
September is a fall month in De Soto, and is warmer than the annual average of 56.4°F. Daily temperatures swing about 25.1°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
80.8°F
Avg Low
55.7°F
Precipitation
2.85 in
Daylight
12h 14m
September records in De Soto
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2011) | 50.0°F (2007) | 2.70 in (2012) |
| September 2 | 98.1°F (2011) | 48.9°F (2009) | 1.10 in (2003) |
| September 3 | 98.1°F (2011) | 53.1°F (2024) | 0.55 in (2022) |
| September 4 | 99.0°F (1999) | 50.0°F (2010) | 3.00 in (2021) |
| September 5 | 97.0°F (1999) | 46.9°F (2010) | 0.51 in (2009) |
| September 6 | 96.1°F (1998) | 44.1°F (2017) | 0.78 in (2018) |
| September 7 | 93.9°F (1998) | 42.1°F (2017) | 1.04 in (2018) |
| September 8 | 95.0°F (2002) | 39.9°F (2025) | 1.29 in (2018) |
| September 9 | 96.1°F (2002) | 41.0°F (2024) | 1.63 in (2015) |
| September 10 | 96.1°F (2002) | 44.1°F (1998) | 1.91 in (2014) |
| September 11 | 95.0°F (2013) | 44.1°F (2017) | 0.09 in (2015) |
| September 12 | 93.0°F (2019) | 46.0°F (2022) | 2.11 in (2020) |
| September 13 | 95.0°F (2011) | 44.1°F (2014) | 1.33 in (2024) |
| September 14 | 98.1°F (2025) | 39.9°F (1999) | 0.85 in (2011) |
| September 15 | 93.0°F (2019) | 44.1°F (1999) | 0.76 in (2005) |
| September 16 | 96.1°F (2019) | 39.9°F (2000) | 1.17 in (2016) |
| September 17 | 93.9°F (2019) | 41.0°F (1999) | 1.05 in (2017) |
| September 18 | 95.0°F (2025) | 41.0°F (1999) | 0.95 in (2001) |
| September 19 | 95.0°F (2022) | 42.1°F (2012) | 0.51 in (2002) |
| September 20 | 98.1°F (2022) | 39.9°F (2006) | 1.11 in (2002) |
| September 21 | 99.0°F (2022) | 44.1°F (2000) | 2.89 in (2021) |
| September 22 | 91.9°F (2005) | 37.9°F (1999) | 1.44 in (2025) |
| September 23 | 93.9°F (2007) | 37.0°F (2012) | 1.76 in (2006) |
| September 24 | 91.9°F (2017) | 36.0°F (2012) | 1.37 in (2009) |
| September 25 | 90.0°F (1998) | 37.9°F (2001) | 3.27 in (2011) |
| September 26 | 89.1°F (1998) | 36.0°F (2001) | 0.61 in (2016) |
| September 27 | 93.0°F (1998) | 39.0°F (2000) | 2.59 in (2024) |
| September 28 | 91.9°F (1999) | 37.0°F (2022) | 0.53 in (2020) |
| September 29 | 93.0°F (2019) | 35.1°F (2022) | 0.95 in (2015) |
| September 30 | 93.9°F (2019) | 33.1°F (2022) | 0.33 in (2003) |