September weather in Walnut Hill, IL
The average temperature in Walnut Hill in September is 68.4°F (55.8°F–81.0°F). Average precipitation: 3.29 inches.
September is a fall month in Walnut Hill, and is warmer than the annual average of 54.7°F. Daily temperatures swing about 25.2°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
81.0°F
Avg Low
55.8°F
Precipitation
3.29 in
Daylight
12h 14m
September records in Walnut Hill
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (2013) | 48.0°F (2009) | 2.30 in (2012) |
| September 2 | 98.1°F (2011) | 45.0°F (2017) | 1.37 in (2012) |
| September 3 | 98.1°F (2011) | 46.9°F (2017) | 1.64 in (2003) |
| September 4 | 98.1°F (2011) | 51.1°F (2010) | 0.82 in (2008) |
| September 5 | 97.0°F (1999) | 48.0°F (2010) | 1.12 in (2008) |
| September 6 | 97.0°F (1999) | 46.0°F (2011) | 0.42 in (2006) |
| September 7 | 99.0°F (1998) | 43.0°F (2017) | 0.70 in (2007) |
| September 8 | 98.1°F (2002) | 45.0°F (2017) | 2.80 in (2018) |
| September 9 | 97.0°F (2002) | 42.1°F (2024) | 2.15 in (2015) |
| September 10 | 96.1°F (2002) | 43.0°F (2024) | 0.92 in (2016) |
| September 11 | 95.0°F (2002) | 46.0°F (2024) | 1.00 in (2014) |
| September 12 | 96.1°F (2013) | 46.9°F (2007) | 0.88 in (2008) |
| September 13 | 93.0°F (1998) | 43.0°F (2014) | 0.17 in (1999) |
| September 14 | 93.9°F (2011) | 41.0°F (2014) | 1.01 in (2008) |
| September 15 | 88.0°F (2018) | 39.9°F (2007) | 1.24 in (2011) |
| September 16 | 91.0°F (2019) | 37.9°F (2000) | 0.72 in (2005) |
| September 17 | 93.0°F (2019) | 41.0°F (1999) | 2.67 in (2016) |
| September 18 | 90.0°F (2018) | 43.0°F (1999) | 1.25 in (2012) |
| September 19 | 90.0°F (2017) | 41.0°F (2020) | 0.82 in (2001) |
| September 20 | 93.0°F (1998) | 37.9°F (2006) | 2.52 in (2005) |
| September 21 | 93.0°F (2017) | 39.0°F (2020) | 1.61 in (1998) |
| September 22 | 96.1°F (2022) | 36.0°F (1999) | 0.45 in (2021) |
| September 23 | 93.9°F (2017) | 37.0°F (2012) | 2.02 in (2006) |
| September 24 | 93.9°F (2007) | 37.9°F (2012) | 0.52 in (2024) |
| September 25 | 93.9°F (2017) | 34.0°F (2001) | 1.52 in (2018) |
| September 26 | 91.9°F (2017) | 34.0°F (2001) | 5.09 in (2012) |
| September 27 | 91.0°F (2017) | 36.0°F (2001) | 1.66 in (2023) |
| September 28 | 95.0°F (1998) | 36.0°F (2022) | 0.91 in (2024) |
| September 29 | 93.0°F (1999) | 34.0°F (2003) | 0.80 in (2005) |
| September 30 | 91.9°F (2019) | 36.0°F (2003) | 1.09 in (2015) |