September weather in Bismarck, ND
The average temperature in Bismarck in September is 58.7°F (46.1°F–71.3°F). Average precipitation: 1.92 inches.
September is a fall month in Bismarck, and is warmer than the annual average of 42.3°F. Daily temperatures swing about 25.2°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
71.3°F
Avg Low
46.1°F
Precipitation
1.92 in
Daylight
12h 19m
September records in Bismarck
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (2008) | 48.0°F (2009) | 0.22 in (2014) |
| September 2 | 97.0°F (2012) | 48.0°F (2008) | 0.73 in (2008) |
| September 3 | 90.0°F (2015) | 39.0°F (2008) | 1.36 in (2021) |
| September 4 | 97.0°F (2015) | 39.0°F (2008) | 0.72 in (2018) |
| September 5 | 87.1°F (2007) | 43.0°F (2014) | 0.22 in (2008) |
| September 6 | 89.1°F (2013) | 39.9°F (2008) | 0.23 in (2010) |
| September 7 | 90.0°F (2013) | 41.0°F (2008) | 2.13 in (2010) |
| September 8 | 84.9°F (2011) | 39.9°F (2008) | 0.96 in (2019) |
| September 9 | 86.0°F (2014) | 37.9°F (2012) | 1.33 in (2013) |
| September 10 | 84.0°F (2017) | 37.0°F (2012) | 0.55 in (2019) |
| September 11 | 93.0°F (2012) | 36.0°F (2014) | 1.52 in (2009) |
| September 12 | 87.1°F (2011) | 37.0°F (2014) | 0.21 in (2019) |
| September 13 | 90.0°F (2017) | 37.9°F (2012) | 1.16 in (2019) |
| September 14 | 93.0°F (2015) | 34.0°F (2007) | 0.37 in (2021) |
| September 15 | 82.0°F (2009) | 32.0°F (2011) | 1.08 in (2013) |
| September 16 | 89.1°F (2012) | 34.0°F (2011) | 0.56 in (2017) |
| September 17 | 84.9°F (2009) | 36.0°F (2017) | 0.37 in (2016) |
| September 18 | 84.9°F (2009) | 32.0°F (2010) | 0.20 in (2010) |
| September 19 | 89.1°F (2008) | 33.1°F (2010) | 0.12 in (2015) |
| September 20 | 87.1°F (2008) | 37.0°F (2007) | 0.45 in (2011) |
| September 21 | 81.0°F (2015) | 37.9°F (2013) | 1.03 in (2018) |
| September 22 | 86.0°F (2015) | 30.0°F (2012) | 0.13 in (2008) |
| September 23 | 82.0°F (2007) | 28.9°F (2012) | 0.33 in (2008) |
| September 24 | 87.1°F (2007) | 30.0°F (2012) | 0.79 in (2010) |
| September 25 | 84.9°F (2014) | 37.9°F (2012) | 0.15 in (2017) |
| September 26 | 91.0°F (2014) | 37.0°F (2018) | 0.07 in (2018) |
| September 27 | 90.0°F (2014) | 34.0°F (2018) | 0.07 in (2007) |
| September 28 | 84.0°F (2014) | 30.0°F (2018) | 0.22 in (2013) |
| September 29 | 82.9°F (2012) | 30.0°F (2018) | 0.04 in (2018) |
| September 30 | 87.1°F (2007) | 35.1°F (2009) | 0.08 in (2021) |