September weather in Summit, SD
The average temperature in Summit in September is 60.5°F (47.9°F–73.0°F). Average precipitation: 2.77 inches.
September is a fall month in Summit, and is warmer than the annual average of 42.6°F. Daily temperatures swing about 25.1°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.0°F
Avg Low
47.9°F
Precipitation
2.77 in
Daylight
12h 18m
September records in Summit
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (1960) | 35.1°F (1965) | 1.93 in (2006) |
| September 2 | 93.0°F (1983) | 34.0°F (1974) | 3.02 in (2021) |
| September 3 | 97.0°F (2023) | 30.9°F (1974) | 0.87 in (1985) |
| September 4 | 97.0°F (2023) | 34.0°F (1956) | 1.27 in (1971) |
| September 5 | 96.1°F (2023) | 30.9°F (1965) | 1.40 in (2004) |
| September 6 | 96.1°F (1980) | 30.9°F (1956) | 1.29 in (2010) |
| September 7 | 93.9°F (1976) | 32.0°F (1986) | 1.01 in (1992) |
| September 8 | 96.1°F (1959) | 34.0°F (1992) | 1.02 in (1976) |
| September 9 | 90.0°F (1958) | 30.9°F (2020) | 1.45 in (1991) |
| September 10 | 90.0°F (1975) | 27.0°F (1959) | 0.95 in (1996) |
| September 11 | 91.0°F (1978) | 28.9°F (1964) | 0.63 in (2009) |
| September 12 | 89.1°F (1969) | 27.0°F (1975) | 1.62 in (2019) |
| September 13 | 90.0°F (1990) | 30.9°F (1970) | 0.97 in (2005) |
| September 14 | 91.9°F (1969) | 30.9°F (1956) | 1.08 in (2001) |
| September 15 | 91.0°F (2018) | 28.0°F (1993) | 1.40 in (2010) |
| September 16 | 88.0°F (2018) | 27.0°F (1959) | 0.85 in (1968) |
| September 17 | 90.0°F (1988) | 30.9°F (1971) | 1.05 in (2004) |
| September 18 | 93.0°F (1984) | 26.1°F (2012) | 1.41 in (2007) |
| September 19 | 96.1°F (1984) | 32.0°F (2003) | 2.49 in (1988) |
| September 20 | 89.1°F (1984) | 27.0°F (1995) | 4.02 in (2007) |
| September 21 | 86.0°F (2005) | 25.0°F (1983) | 2.95 in (1989) |
| September 22 | 88.0°F (2017) | 21.0°F (1974) | 1.66 in (2006) |
| September 23 | 86.0°F (2007) | 23.0°F (2012) | 1.62 in (2004) |
| September 24 | 84.0°F (1990) | 23.0°F (2000) | 1.51 in (2017) |
| September 25 | 84.0°F (2014) | 25.0°F (1982) | 0.95 in (2009) |
| September 26 | 90.0°F (1974) | 18.0°F (1965) | 0.72 in (1996) |
| September 27 | 90.0°F (1956) | 23.0°F (1967) | 0.42 in (1961) |
| September 28 | 87.1°F (2011) | 19.0°F (1992) | 1.61 in (2013) |
| September 29 | 89.1°F (2024) | 21.0°F (1984) | 1.07 in (1965) |
| September 30 | 88.0°F (1976) | 15.1°F (1974) | 1.36 in (1995) |