September weather in Harrisburg, PA
The average temperature in Harrisburg in September is 64.9°F (54.8°F–75.1°F). Average precipitation: 4.58 inches.
September is a fall month in Harrisburg, and is warmer than the annual average of 51.9°F. Daily temperatures swing about 20.3°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
75.1°F
Avg Low
54.8°F
Precipitation
4.58 in
Daylight
12h 15m
September records in Harrisburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.0°F (2010) | 44.1°F (2009) | 0.50 in (2001) |
| September 2 | 93.9°F (2010) | 48.0°F (2017) | 5.03 in (2021) |
| September 3 | 93.9°F (2010) | 48.0°F (2024) | 1.72 in (2006) |
| September 4 | 91.0°F (2018) | 46.0°F (2024) | 1.16 in (2012) |
| September 5 | 91.9°F (2023) | 46.9°F (2024) | 2.73 in (2011) |
| September 6 | 91.9°F (2018) | 46.0°F (2000) | 2.50 in (2022) |
| September 7 | 91.0°F (1998) | 48.0°F (2000) | 4.35 in (1999) |
| September 8 | 93.0°F (2023) | 39.0°F (2003) | 3.67 in (2011) |
| September 9 | 91.9°F (2016) | 39.0°F (2003) | 0.90 in (2004) |
| September 10 | 91.0°F (2015) | 39.0°F (2003) | 2.21 in (2018) |
| September 11 | 91.0°F (2013) | 42.1°F (2003) | 0.94 in (2015) |
| September 12 | 93.9°F (2013) | 42.1°F (2003) | 1.62 in (2009) |
| September 13 | 89.1°F (1998) | 33.1°F (2002) | 1.40 in (2013) |
| September 14 | 88.0°F (2005) | 33.1°F (2002) | 0.75 in (2006) |
| September 15 | 88.0°F (2024) | 44.1°F (2013) | 0.86 in (2011) |
| September 16 | 88.0°F (2005) | 42.1°F (2020) | 1.08 in (1999) |
| September 17 | 88.0°F (1998) | 41.0°F (2007) | 2.58 in (1999) |
| September 18 | 86.0°F (2005) | 41.0°F (2007) | 5.50 in (2004) |
| September 19 | 87.1°F (2025) | 39.9°F (2020) | 2.10 in (2012) |
| September 20 | 89.1°F (2025) | 37.0°F (2020) | 1.47 in (2000) |
| September 21 | 86.0°F (2024) | 37.0°F (2020) | 0.60 in (1999) |
| September 22 | 84.0°F (2014) | 39.0°F (2020) | 1.40 in (2024) |
| September 23 | 88.0°F (2010) | 37.9°F (2004) | 3.04 in (2003) |
| September 24 | 89.1°F (2019) | 39.9°F (1998) | 1.61 in (2011) |
| September 25 | 91.0°F (2010) | 24.1°F (2008) | 1.53 in (2001) |
| September 26 | 86.0°F (2007) | 39.9°F (1998) | 1.45 in (2000) |
| September 27 | 88.0°F (2007) | 36.0°F (2002) | 1.53 in (2002) |
| September 28 | 89.1°F (1998) | 41.0°F (2000) | 1.44 in (2010) |
| September 29 | 89.1°F (1998) | 37.0°F (2000) | 2.58 in (2004) |
| September 30 | 79.0°F (2008) | 37.0°F (2000) | 1.92 in (2015) |