September weather in Summerset, SD
The average temperature in Summerset in September is 60.4°F (46.9°F–73.9°F). Average precipitation: 1.48 inches.
September is a fall month in Summerset, and is warmer than the annual average of 46.3°F. Daily temperatures swing about 27°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
73.9°F
Avg Low
46.9°F
Precipitation
1.48 in
Daylight
12h 17m
September records in Summerset
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1983) | 0.0°F (2002) | 1.12 in (1963) |
| September 2 | 102.9°F (1960) | 0.0°F (2002) | 0.88 in (1986) |
| September 3 | 102.0°F (2023) | 33.1°F (1974) | 0.92 in (1951) |
| September 4 | 102.9°F (1960) | 34.0°F (1962) | 0.88 in (1997) |
| September 5 | 100.0°F (2020) | 39.0°F (1999) | 0.45 in (2023) |
| September 6 | 100.9°F (1978) | 34.0°F (1956) | 0.52 in (1986) |
| September 7 | 99.0°F (1983) | 30.0°F (2020) | 0.55 in (1951) |
| September 8 | 100.0°F (1959) | 0.0°F (2002) | 1.10 in (2020) |
| September 9 | 100.0°F (1979) | 28.0°F (2020) | 0.87 in (2002) |
| September 10 | 98.1°F (1998) | 28.0°F (2020) | 0.65 in (1949) |
| September 11 | 95.0°F (1998) | 28.0°F (1989) | 0.50 in (2014) |
| September 12 | 93.9°F (2025) | 28.0°F (1989) | 0.61 in (2009) |
| September 13 | 95.0°F (1990) | 28.9°F (2014) | 1.95 in (2009) |
| September 14 | 93.0°F (1955) | 27.0°F (1993) | 3.07 in (1998) |
| September 15 | 95.0°F (2020) | 0.0°F (2002) | 0.93 in (2004) |
| September 16 | 97.0°F (1979) | 28.9°F (1965) | 0.85 in (1959) |
| September 17 | 91.0°F (2019) | 30.9°F (1965) | 0.51 in (2006) |
| September 18 | 95.0°F (2021) | 26.1°F (1991) | 0.74 in (1996) |
| September 19 | 93.9°F (1998) | 25.0°F (1991) | 0.72 in (1993) |
| September 20 | 96.1°F (2022) | 27.0°F (1983) | 1.18 in (1955) |
| September 21 | 86.0°F (2010) | 0.0°F (2002) | 1.92 in (1989) |
| September 22 | 93.0°F (1954) | 0.0°F (2002) | 0.58 in (1960) |
| September 23 | 91.9°F (1958) | 26.1°F (1983) | 1.91 in (1977) |
| September 24 | 93.0°F (1992) | 28.0°F (1984) | 0.64 in (1955) |
| September 25 | 91.9°F (1974) | 23.0°F (1984) | 1.00 in (1959) |
| September 26 | 91.9°F (1956) | 21.0°F (1972) | 0.35 in (1996) |
| September 27 | 96.1°F (2024) | 27.0°F (1964) | 0.22 in (1984) |
| September 28 | 91.0°F (1957) | 28.0°F (1951) | 0.97 in (1971) |
| September 29 | 90.0°F (2021) | 0.0°F (2002) | 0.65 in (1965) |
| September 30 | 98.1°F (2024) | 26.1°F (1961) | 2.75 in (2014) |