September weather in Bison, SD
The average temperature in Bison in September is 61.9°F (47.5°F–76.4°F). Average precipitation: 1.38 inches.
September is a fall month in Bison, and is warmer than the annual average of 45.7°F. Daily temperatures swing about 28.9°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
76.4°F
Avg Low
47.5°F
Precipitation
1.38 in
Daylight
12h 18m
September records in Bison
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1970) | 35.1°F (1956) | 0.76 in (1977) |
| September 2 | 102.9°F (1971) | 32.0°F (1974) | 0.46 in (1973) |
| September 3 | 107.1°F (1960) | 34.0°F (1918) | 0.73 in (1973) |
| September 4 | 104.0°F (1960) | 28.0°F (1962) | 1.22 in (1971) |
| September 5 | 102.0°F (1960) | 32.0°F (1965) | 1.61 in (2023) |
| September 6 | 102.0°F (1945) | 33.1°F (1956) | 1.12 in (2010) |
| September 7 | 97.0°F (2002) | 34.0°F (1986) | 1.15 in (1945) |
| September 8 | 102.0°F (1959) | 32.0°F (2020) | 3.66 in (2013) |
| September 9 | 99.0°F (1998) | 30.9°F (2020) | 0.87 in (1933) |
| September 10 | 98.1°F (1998) | 30.9°F (1962) | 1.85 in (2003) |
| September 11 | 95.0°F (1990) | 28.0°F (1989) | 0.33 in (1987) |
| September 12 | 96.1°F (1958) | 30.0°F (1964) | 1.60 in (1961) |
| September 13 | 96.1°F (1990) | 27.0°F (1949) | 0.40 in (1998) |
| September 14 | 100.0°F (1948) | 25.0°F (1993) | 0.61 in (2001) |
| September 15 | 105.1°F (1948) | 26.1°F (1916) | 0.90 in (1967) |
| September 16 | 95.0°F (2002) | 30.0°F (1965) | 3.15 in (2025) |
| September 17 | 93.9°F (1989) | 27.0°F (1965) | 0.55 in (1942) |
| September 18 | 95.0°F (1948) | 26.1°F (1991) | 1.94 in (1996) |
| September 19 | 95.0°F (2021) | 25.0°F (1991) | 0.37 in (1996) |
| September 20 | 96.1°F (1937) | 21.0°F (1995) | 1.23 in (1989) |
| September 21 | 91.9°F (1936) | 24.1°F (1983) | 0.80 in (1955) |
| September 22 | 95.0°F (1936) | 19.9°F (1983) | 1.94 in (2006) |
| September 23 | 97.0°F (1958) | 24.1°F (1984) | 1.90 in (1977) |
| September 24 | 91.9°F (1992) | 21.9°F (1965) | 0.92 in (2023) |
| September 25 | 91.9°F (2014) | 21.9°F (1984) | 0.72 in (1986) |
| September 26 | 98.1°F (2024) | 18.0°F (1942) | 0.68 in (1966) |
| September 27 | 93.9°F (1952) | 21.0°F (1951) | 0.57 in (1946) |
| September 28 | 95.0°F (2021) | 21.0°F (1951) | 0.57 in (1982) |
| September 29 | 99.0°F (2024) | 23.0°F (1939) | 0.80 in (2014) |
| September 30 | 99.0°F (2024) | 25.0°F (1958) | 0.64 in (2019) |