September weather in Edgemont, SD
The average temperature in Edgemont in September is 59.5°F (41.5°F–77.6°F). Average precipitation: 1.21 inches.
September is a fall month in Edgemont, and is warmer than the annual average of 44.4°F. Daily temperatures swing about 36.1°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
77.6°F
Avg Low
41.5°F
Precipitation
1.21 in
Snow
0.1 in
September records in Edgemont
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (2011) | 35.1°F (2020) | 0.23 in (2000) |
| September 2 | 100.9°F (2022) | 30.9°F (2006) | 0.45 in (1986) |
| September 3 | 100.9°F (2015) | 27.0°F (2006) | 0.43 in (1999) |
| September 4 | 104.0°F (2024) | 35.1°F (2010) | 0.74 in (2021) |
| September 5 | 102.9°F (2022) | 32.0°F (2017) | 0.99 in (2004) |
| September 6 | 105.1°F (2020) | 27.0°F (2025) | 0.89 in (1990) |
| September 7 | 100.9°F (2013) | 26.1°F (2025) | 0.30 in (1948) |
| September 8 | 102.0°F (2022) | 33.1°F (2001) | 0.92 in (2002) |
| September 9 | 96.1°F (1979) | 28.9°F (2020) | 0.76 in (2003) |
| September 10 | 99.0°F (1979) | 25.0°F (2020) | 0.61 in (1989) |
| September 11 | 98.1°F (2012) | 24.1°F (2020) | 0.25 in (2023) |
| September 12 | 98.1°F (2017) | 33.1°F (2022) | 0.50 in (2002) |
| September 13 | 98.1°F (2018) | 28.9°F (1999) | 0.39 in (2009) |
| September 14 | 95.0°F (2015) | 21.9°F (1993) | 0.19 in (1982) |
| September 15 | 96.1°F (2015) | 32.0°F (1979) | 0.60 in (2011) |
| September 16 | 96.1°F (2019) | 32.0°F (2014) | 0.56 in (2017) |
| September 17 | 96.1°F (2000) | 32.0°F (2017) | 0.42 in (2003) |
| September 18 | 93.9°F (1998) | 24.1°F (1991) | 0.96 in (2025) |
| September 19 | 96.1°F (2021) | 21.0°F (1991) | 0.49 in (1986) |
| September 20 | 93.9°F (2022) | 26.1°F (2017) | 1.49 in (1990) |
| September 21 | 93.9°F (2010) | 19.9°F (1983) | 1.91 in (1989) |
| September 22 | 95.0°F (2013) | 21.9°F (1995) | 0.51 in (2000) |
| September 23 | 93.0°F (2007) | 28.0°F (1985) | 0.95 in (2025) |
| September 24 | 93.9°F (1992) | 25.0°F (1984) | 0.49 in (2016) |
| September 25 | 95.0°F (2020) | 17.1°F (1984) | 0.63 in (1986) |
| September 26 | 96.1°F (2014) | 23.0°F (1985) | 0.40 in (1996) |
| September 27 | 100.0°F (2014) | 26.1°F (2018) | 0.05 in (1999) |
| September 28 | 93.0°F (2021) | 23.0°F (1999) | 0.72 in (1982) |
| September 29 | 97.0°F (2010) | 8.1°F (1984) | 1.04 in (2014) |
| September 30 | 100.0°F (2024) | 10.9°F (1984) | 3.46 in (2014) |