September weather in Spearfish, SD
The average temperature in Spearfish in September is 60.8°F (47.6°F–74.0°F). Average precipitation: 1.56 inches.
September is a fall month in Spearfish, and is warmer than the annual average of 46.5°F. Daily temperatures swing about 26.4°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
74.0°F
Avg Low
47.6°F
Precipitation
1.56 in
Snow
0.1 in
September records in Spearfish
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (1929) | 37.9°F (1965) | 0.80 in (1914) |
| September 2 | 99.0°F (1945) | 37.9°F (1902) | 1.40 in (1919) |
| September 3 | 99.0°F (2002) | 35.1°F (1974) | 1.07 in (1968) |
| September 4 | 100.9°F (1960) | 30.0°F (1962) | 1.71 in (1941) |
| September 5 | 97.0°F (2001) | 33.1°F (1902) | 2.39 in (2023) |
| September 6 | 102.9°F (1978) | 34.0°F (1929) | 1.50 in (1986) |
| September 7 | 105.1°F (1978) | 30.0°F (1929) | 1.37 in (1945) |
| September 8 | 100.0°F (1959) | 28.9°F (1929) | 1.35 in (2020) |
| September 9 | 98.1°F (1931) | 28.0°F (2020) | 1.10 in (2002) |
| September 10 | 98.1°F (1988) | 28.9°F (1962) | 2.05 in (2003) |
| September 11 | 96.1°F (1978) | 28.9°F (1921) | 2.60 in (1903) |
| September 12 | 97.0°F (2004) | 30.0°F (1949) | 1.00 in (1988) |
| September 13 | 95.0°F (1936) | 27.0°F (1904) | 2.29 in (1966) |
| September 14 | 97.0°F (1948) | 28.0°F (1961) | 0.70 in (1967) |
| September 15 | 99.0°F (1948) | 28.9°F (1903) | 2.00 in (1899) |
| September 16 | 91.9°F (1908) | 27.0°F (1959) | 2.78 in (1913) |
| September 17 | 95.0°F (1920) | 26.1°F (1965) | 1.60 in (1923) |
| September 18 | 93.9°F (1914) | 26.1°F (1901) | 1.94 in (2002) |
| September 19 | 93.0°F (2004) | 27.0°F (1965) | 0.45 in (1995) |
| September 20 | 93.0°F (1937) | 25.0°F (1995) | 1.05 in (1955) |
| September 21 | 93.0°F (1922) | 28.0°F (1934) | 1.62 in (1989) |
| September 22 | 91.9°F (1936) | 21.9°F (1985) | 2.00 in (2006) |
| September 23 | 91.9°F (1936) | 27.0°F (1965) | 2.20 in (2006) |
| September 24 | 90.0°F (1938) | 19.9°F (1926) | 1.68 in (1918) |
| September 25 | 95.0°F (2014) | 15.1°F (1926) | 1.70 in (1929) |
| September 26 | 95.0°F (2014) | 19.9°F (1942) | 0.62 in (1894) |
| September 27 | 93.0°F (1952) | 24.1°F (1951) | 1.10 in (1988) |
| September 28 | 90.0°F (2010) | 21.0°F (1951) | 3.00 in (1923) |
| September 29 | 95.0°F (2014) | 23.0°F (1959) | 1.78 in (1927) |
| September 30 | 90.0°F (1963) | 21.0°F (1961) | 1.54 in (2014) |