September weather in Cottonwood, SD
The average temperature in Cottonwood in September is 61.6°F (45.0°F–78.2°F). Average precipitation: 1.22 inches.
September is a fall month in Cottonwood, and is warmer than the annual average of 46.1°F. Daily temperatures swing about 33.2°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
78.2°F
Avg Low
45.0°F
Precipitation
1.22 in
Daylight
12h 17m
September records in Cottonwood
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 107.1°F (1929) | 33.1°F (1981) | 0.89 in (1920) |
| September 2 | 106.0°F (1960) | 37.0°F (1952) | 1.01 in (2021) |
| September 3 | 105.1°F (2023) | 33.1°F (1928) | 1.20 in (1999) |
| September 4 | 107.1°F (1960) | 28.0°F (1962) | 1.18 in (1971) |
| September 5 | 108.0°F (2001) | 34.0°F (1929) | 1.85 in (1971) |
| September 6 | 106.0°F (1976) | 30.9°F (1934) | 3.20 in (1911) |
| September 7 | 106.0°F (1931) | 30.0°F (1986) | 1.10 in (1970) |
| September 8 | 105.1°F (1959) | 33.1°F (1943) | 0.81 in (2005) |
| September 9 | 108.0°F (1931) | 25.0°F (1943) | 1.27 in (2002) |
| September 10 | 106.0°F (1931) | 28.0°F (1962) | 1.37 in (2002) |
| September 11 | 105.1°F (2012) | 25.0°F (1940) | 0.32 in (2019) |
| September 12 | 100.0°F (1919) | 28.9°F (1964) | 0.39 in (1982) |
| September 13 | 100.9°F (2017) | 28.9°F (1949) | 2.52 in (1966) |
| September 14 | 102.9°F (1948) | 25.0°F (1993) | 1.50 in (1928) |
| September 15 | 105.1°F (1948) | 23.0°F (1916) | 0.86 in (2025) |
| September 16 | 100.0°F (1910) | 28.0°F (1981) | 1.29 in (1923) |
| September 17 | 100.0°F (2000) | 26.1°F (1981) | 0.76 in (1959) |
| September 18 | 106.0°F (2000) | 24.1°F (1991) | 1.73 in (1946) |
| September 19 | 100.0°F (1914) | 18.0°F (1991) | 0.95 in (1993) |
| September 20 | 102.0°F (1937) | 18.0°F (1991) | 3.30 in (1955) |
| September 21 | 98.1°F (1922) | 21.9°F (1954) | 2.15 in (1989) |
| September 22 | 98.1°F (1936) | 21.9°F (1995) | 0.99 in (2006) |
| September 23 | 99.0°F (1958) | 24.1°F (1965) | 0.85 in (1977) |
| September 24 | 95.0°F (1992) | 19.9°F (1965) | 1.62 in (1973) |
| September 25 | 97.0°F (1992) | 10.0°F (1926) | 0.90 in (1930) |
| September 26 | 97.0°F (1974) | 15.1°F (1934) | 0.93 in (1915) |
| September 27 | 99.0°F (2024) | 17.1°F (1928) | 0.10 in (1924) |
| September 28 | 98.1°F (1931) | 18.0°F (1951) | 0.98 in (1923) |
| September 29 | 96.1°F (1931) | 16.0°F (1984) | 0.76 in (1965) |
| September 30 | 98.1°F (2024) | 19.0°F (1974) | 1.50 in (2014) |