September weather in Wilmington, OH
The average temperature in Wilmington in September is 66.7°F (54.6°F–78.7°F). Average precipitation: 3.03 inches.
September is a fall month in Wilmington, and is warmer than the annual average of 53.7°F. Daily temperatures swing about 24.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
78.7°F
Avg Low
54.6°F
Precipitation
3.03 in
Daylight
12h 15m
September records in Wilmington
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2011) | 46.9°F (2009) | 2.16 in (2003) |
| September 2 | 97.0°F (2011) | 50.0°F (1995) | 0.96 in (2003) |
| September 3 | 98.1°F (2011) | 48.0°F (1997) | 1.99 in (2012) |
| September 4 | 93.9°F (2018) | 42.1°F (1997) | 0.61 in (2025) |
| September 5 | 96.1°F (2007) | 42.1°F (2010) | 1.69 in (2022) |
| September 6 | 93.9°F (2007) | 46.9°F (2017) | 0.44 in (2022) |
| September 7 | 93.9°F (2002) | 44.1°F (2025) | 0.93 in (2011) |
| September 8 | 96.1°F (2002) | 39.9°F (2024) | 1.57 in (2018) |
| September 9 | 93.9°F (2002) | 42.1°F (2024) | 1.32 in (2018) |
| September 10 | 93.0°F (2013) | 43.0°F (1998) | 1.02 in (2016) |
| September 11 | 90.0°F (2019) | 43.0°F (1995) | 0.52 in (2015) |
| September 12 | 93.0°F (2019) | 45.0°F (2002) | 3.95 in (2006) |
| September 13 | 93.9°F (2019) | 45.0°F (2014) | 0.58 in (2004) |
| September 14 | 95.0°F (1998) | 42.1°F (2013) | 0.21 in (2011) |
| September 15 | 89.1°F (2018) | 42.1°F (2007) | 1.89 in (2002) |
| September 16 | 90.0°F (2019) | 39.0°F (2007) | 1.46 in (1996) |
| September 17 | 89.1°F (2021) | 41.0°F (2000) | 0.98 in (2004) |
| September 18 | 93.0°F (2021) | 0.0°F (2015) | 0.35 in (2006) |
| September 19 | 90.0°F (2018) | 0.0°F (2015) | 0.54 in (2002) |
| September 20 | 91.0°F (2018) | 0.0°F (2015) | 1.50 in (2002) |
| September 21 | 93.9°F (2022) | 0.0°F (2015) | 1.55 in (2013) |
| September 22 | 93.0°F (2010) | 35.1°F (1995) | 1.90 in (2021) |
| September 23 | 93.9°F (2010) | 32.0°F (1995) | 1.70 in (2000) |
| September 24 | 95.0°F (2007) | 34.0°F (2012) | 1.08 in (2018) |
| September 25 | 91.9°F (2007) | 39.9°F (1996) | 1.05 in (2000) |
| September 26 | 90.0°F (2017) | 43.0°F (2000) | 0.99 in (2011) |
| September 27 | 90.0°F (2017) | 41.0°F (2000) | 2.39 in (2024) |
| September 28 | 91.0°F (2019) | 39.0°F (2001) | 0.60 in (2024) |
| September 29 | 90.0°F (2019) | 37.9°F (2000) | 1.06 in (2015) |
| September 30 | 93.0°F (2019) | 39.0°F (2005) | 0.33 in (2008) |