September weather in New Witten, SD
The average temperature in New Witten in September is 66.1°F (53.0°F–79.2°F). Average precipitation: 1.81 inches.
September is a fall month in New Witten, and is warmer than the annual average of 50.2°F. Daily temperatures swing about 26.2°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
79.2°F
Avg Low
53.0°F
Precipitation
1.81 in
Daylight
12h 17m
September records in New Witten
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (2012) | 48.9°F (2006) | 2.00 in (2008) |
| September 2 | 107.1°F (2023) | 46.9°F (2006) | 0.90 in (2021) |
| September 3 | 106.0°F (2023) | 41.0°F (2008) | 0.83 in (1999) |
| September 4 | 102.9°F (2001) | 45.0°F (2006) | 1.07 in (2016) |
| September 5 | 102.9°F (1998) | 41.0°F (2025) | 0.17 in (2023) |
| September 6 | 100.0°F (2002) | 37.0°F (2025) | 0.88 in (2007) |
| September 7 | 99.0°F (2022) | 39.9°F (2025) | 0.29 in (2015) |
| September 8 | 102.9°F (2022) | 39.0°F (2020) | 0.21 in (2000) |
| September 9 | 98.1°F (2005) | 39.0°F (2012) | 0.48 in (2014) |
| September 10 | 100.9°F (2012) | 37.9°F (2020) | 0.95 in (2019) |
| September 11 | 98.1°F (2018) | 41.0°F (2014) | 0.98 in (2019) |
| September 12 | 100.0°F (2004) | 37.0°F (2014) | 0.42 in (2019) |
| September 13 | 97.0°F (2000) | 39.0°F (2014) | 1.48 in (2001) |
| September 14 | 99.0°F (2015) | 32.0°F (2007) | 1.27 in (2001) |
| September 15 | 97.0°F (2015) | 37.0°F (2011) | 0.42 in (2001) |
| September 16 | 97.0°F (2003) | 43.0°F (2011) | 0.48 in (2021) |
| September 17 | 98.1°F (2000) | 39.9°F (2006) | 2.41 in (2025) |
| September 18 | 98.1°F (2013) | 39.0°F (2003) | 0.52 in (2015) |
| September 19 | 97.0°F (2023) | 33.1°F (2006) | 0.52 in (2018) |
| September 20 | 99.0°F (2010) | 36.0°F (2006) | 0.53 in (2018) |
| September 21 | 93.0°F (2005) | 39.0°F (1999) | 1.08 in (2006) |
| September 22 | 91.0°F (2020) | 32.0°F (2011) | 0.55 in (2004) |
| September 23 | 95.0°F (2016) | 34.0°F (2000) | 1.54 in (2017) |
| September 24 | 90.0°F (1999) | 30.9°F (2000) | 0.63 in (2005) |
| September 25 | 93.0°F (2014) | 35.1°F (2003) | 0.47 in (2018) |
| September 26 | 95.0°F (2024) | 39.0°F (2002) | 0.27 in (1998) |
| September 27 | 93.9°F (2021) | 36.0°F (2002) | 0.34 in (2013) |
| September 28 | 98.1°F (2021) | 36.0°F (2004) | 0.39 in (2015) |
| September 29 | 96.1°F (2024) | 35.1°F (2009) | 0.38 in (2007) |
| September 30 | 91.0°F (2013) | 36.0°F (2011) | 1.58 in (2021) |