September weather in Custer, SD
The average temperature in Custer in September is 58.5°F (46.0°F–70.9°F). Average precipitation: 1.53 inches. Average snowfall is 0.8 inches.
September is a fall month in Custer, and is warmer than the annual average of 44.9°F. Daily temperatures swing about 24.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
70.9°F
Avg Low
46.0°F
Precipitation
1.53 in
Snow
0.8 in
September records in Custer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (1960) | 27.0°F (1965) | 1.17 in (1963) |
| September 2 | 95.0°F (1969) | 26.1°F (1952) | 1.04 in (1973) |
| September 3 | 97.0°F (1971) | 26.1°F (1974) | 1.05 in (1963) |
| September 4 | 91.9°F (1978) | 21.9°F (1961) | 0.78 in (2004) |
| September 5 | 93.9°F (1978) | 23.0°F (2023) | 1.00 in (2004) |
| September 6 | 93.9°F (1978) | 19.9°F (1956) | 1.27 in (1982) |
| September 7 | 90.0°F (1978) | 28.0°F (1956) | 1.38 in (1989) |
| September 8 | 91.9°F (2022) | 27.0°F (2020) | 1.39 in (1919) |
| September 9 | 91.9°F (1959) | 19.9°F (2020) | 1.45 in (2002) |
| September 10 | 90.0°F (1979) | 19.0°F (1962) | 0.94 in (2010) |
| September 11 | 89.1°F (2012) | 21.0°F (1989) | 1.19 in (2019) |
| September 12 | 88.0°F (1990) | 24.1°F (1943) | 0.88 in (2009) |
| September 13 | 88.0°F (1959) | 19.0°F (1993) | 0.41 in (2002) |
| September 14 | 87.1°F (1955) | 17.1°F (1961) | 1.14 in (1998) |
| September 15 | 86.0°F (1959) | 19.0°F (1961) | 1.64 in (1913) |
| September 16 | 90.0°F (1948) | 23.0°F (1943) | 0.62 in (1959) |
| September 17 | 88.0°F (2000) | 19.0°F (1971) | 0.72 in (1996) |
| September 18 | 89.1°F (2000) | 21.9°F (1991) | 0.83 in (1946) |
| September 19 | 84.9°F (1972) | 26.1°F (1945) | 0.67 in (1946) |
| September 20 | 86.0°F (1979) | 19.0°F (1983) | 1.00 in (1989) |
| September 21 | 89.1°F (1956) | 19.0°F (1995) | 1.20 in (1998) |
| September 22 | 82.0°F (1953) | 19.0°F (1985) | 0.51 in (1963) |
| September 23 | 84.9°F (1958) | 19.0°F (1956) | 1.10 in (1977) |
| September 24 | 82.9°F (1992) | 14.0°F (1984) | 0.75 in (1986) |
| September 25 | 84.9°F (1967) | 21.0°F (1985) | 1.73 in (1929) |
| September 26 | 84.9°F (2001) | 15.1°F (1972) | 0.57 in (1966) |
| September 27 | 86.0°F (2024) | 12.0°F (1984) | 0.65 in (1986) |
| September 28 | 84.0°F (1952) | 15.1°F (1984) | 1.14 in (1923) |
| September 29 | 84.0°F (1957) | 10.9°F (1985) | 1.49 in (2014) |
| September 30 | 86.0°F (2024) | 8.1°F (1961) | 2.15 in (2014) |