September weather in Dover, NH
The average temperature in Dover in September is 60.8°F (49.8°F–71.7°F). Average precipitation: 3.86 inches.
September is a fall month in Dover, and is warmer than the annual average of 47.1°F. Daily temperatures swing about 21.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
71.7°F
Avg Low
49.8°F
Precipitation
3.86 in
Daylight
12h 17m
September records in Dover
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.9°F (2010) | 41.2°F (2002) | 0.84 in (2021) |
| September 2 | 91.0°F (2010) | 40.3°F (2017) | 2.06 in (2013) |
| September 3 | 89.2°F (2018) | 45.9°F (2004) | 0.83 in (2017) |
| September 4 | 86.0°F (2018) | 46.0°F (2024) | 0.76 in (2003) |
| September 5 | 88.2°F (2023) | 44.4°F (2013) | 1.79 in (2022) |
| September 6 | 89.6°F (2018) | 42.6°F (2013) | 3.68 in (2008) |
| September 7 | 91.2°F (2007) | 40.8°F (2009) | 1.23 in (2011) |
| September 8 | 92.1°F (2007) | 43.7°F (2013) | 0.27 in (2012) |
| September 9 | 92.8°F (2002) | 38.8°F (2013) | 2.10 in (2004) |
| September 10 | 91.4°F (2002) | 38.7°F (2003) | 0.56 in (2018) |
| September 11 | 91.9°F (2013) | 41.2°F (2006) | 1.23 in (2007) |
| September 12 | 86.7°F (2005) | 40.5°F (2002) | 3.41 in (2013) |
| September 13 | 83.5°F (2016) | 38.5°F (2002) | 1.18 in (2013) |
| September 14 | 85.1°F (2005) | 38.7°F (2019) | 0.44 in (2008) |
| September 15 | 82.9°F (2021) | 35.1°F (2020) | 1.19 in (2017) |
| September 16 | 83.8°F (2018) | 37.8°F (2007) | 1.54 in (2003) |
| September 17 | 87.3°F (2015) | 35.8°F (2011) | 0.44 in (2010) |
| September 18 | 86.0°F (2015) | 37.2°F (2013) | 3.31 in (2023) |
| September 19 | 81.0°F (2015) | 33.4°F (2014) | 1.54 in (2016) |
| September 20 | 81.0°F (2016) | 30.7°F (2014) | 0.10 in (2024) |
| September 21 | 82.4°F (2019) | 33.1°F (2020) | 0.61 in (2014) |
| September 22 | 84.0°F (2019) | 34.7°F (2020) | 1.35 in (2022) |
| September 23 | 85.8°F (2019) | 37.4°F (2014) | 1.30 in (2003) |
| September 24 | 85.5°F (2017) | 36.9°F (2012) | 0.22 in (2006) |
| September 25 | 85.8°F (2007) | 34.5°F (2012) | 1.26 in (2025) |
| September 26 | 90.1°F (2007) | 34.9°F (2009) | 1.90 in (2008) |
| September 27 | 85.5°F (2017) | 33.4°F (2015) | 1.17 in (2008) |
| September 28 | 83.7°F (2014) | 40.3°F (2012) | 1.07 in (2012) |
| September 29 | 79.9°F (2015) | 37.6°F (2002) | 0.73 in (2011) |
| September 30 | 77.0°F (2010) | 36.5°F (2006) | 2.58 in (2015) |