September weather in Harrison, NJ
The average temperature in Harrison in September is 68.8°F (60.1°F–77.5°F). Average precipitation: 4.33 inches.
September is a fall month in Harrison, and is warmer than the annual average of 54.8°F. Daily temperatures swing about 17.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
77.5°F
Avg Low
60.1°F
Precipitation
4.33 in
Daylight
12h 15m
September records in Harrison
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2010) | 54.0°F (2017) | 0.72 in (2014) |
| September 2 | 96.1°F (2010) | 52.0°F (2017) | 8.59 in (2021) |
| September 3 | 93.9°F (2014) | 52.0°F (2017) | 1.38 in (2000) |
| September 4 | 95.0°F (2018) | 48.9°F (1997) | 1.27 in (2000) |
| September 5 | 93.9°F (2018) | 51.1°F (1997) | 0.89 in (2025) |
| September 6 | 95.0°F (2023) | 55.0°F (2010) | 4.10 in (2008) |
| September 7 | 97.0°F (2018) | 55.9°F (2013) | 1.29 in (2025) |
| September 8 | 96.1°F (2023) | 53.1°F (2024) | 2.83 in (2004) |
| September 9 | 99.0°F (2015) | 53.1°F (1998) | 0.84 in (2023) |
| September 10 | 93.0°F (2002) | 53.1°F (2017) | 1.25 in (2018) |
| September 11 | 93.0°F (2016) | 51.1°F (2012) | 1.20 in (2023) |
| September 12 | 96.1°F (2013) | 51.1°F (2006) | 0.63 in (2022) |
| September 13 | 96.1°F (2005) | 55.0°F (2006) | 1.10 in (2022) |
| September 14 | 93.0°F (2008) | 51.1°F (2014) | 1.82 in (2001) |
| September 15 | 93.0°F (2016) | 48.9°F (2013) | 1.85 in (2005) |
| September 16 | 90.0°F (1998) | 48.9°F (2007) | 6.96 in (1999) |
| September 17 | 88.0°F (2015) | 48.0°F (2013) | 0.95 in (1996) |
| September 18 | 89.1°F (2015) | 46.9°F (2013) | 1.55 in (2004) |
| September 19 | 90.0°F (2005) | 46.9°F (2013) | 1.69 in (2018) |
| September 20 | 88.0°F (2022) | 48.0°F (2020) | 0.77 in (2001) |
| September 21 | 86.0°F (2002) | 45.0°F (2020) | 0.81 in (1999) |
| September 22 | 89.1°F (2010) | 43.0°F (1997) | 0.69 in (2013) |
| September 23 | 90.0°F (2019) | 46.9°F (2014) | 1.13 in (2011) |
| September 24 | 90.0°F (2016) | 44.1°F (1998) | 2.21 in (2021) |
| September 25 | 91.0°F (2017) | 41.0°F (1997) | 0.79 in (2023) |
| September 26 | 90.0°F (2017) | 41.0°F (2001) | 2.67 in (2018) |
| September 27 | 93.0°F (1998) | 45.0°F (1997) | 1.27 in (2002) |
| September 28 | 91.0°F (2007) | 48.9°F (2001) | 3.25 in (2004) |
| September 29 | 87.1°F (2025) | 50.0°F (1998) | 1.14 in (2004) |
| September 30 | 82.0°F (2015) | 48.0°F (2003) | 2.36 in (2020) |