September weather in Eureka, SD
The average temperature in Eureka in September is 58.9°F (45.9°F–71.9°F). Average precipitation: 1.79 inches.
September is a fall month in Eureka, and is warmer than the annual average of 41.8°F. Daily temperatures swing about 26°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
71.9°F
Avg Low
45.9°F
Precipitation
1.79 in
Daylight
12h 18m
September records in Eureka
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (1929) | 32.0°F (1974) | 1.04 in (1973) |
| September 2 | 102.9°F (1983) | 33.1°F (1974) | 1.51 in (1973) |
| September 3 | 98.1°F (1971) | 28.9°F (1934) | 1.41 in (1926) |
| September 4 | 100.0°F (1922) | 34.0°F (1956) | 1.12 in (1926) |
| September 5 | 104.0°F (1945) | 28.9°F (1965) | 0.94 in (1910) |
| September 6 | 100.0°F (1945) | 30.0°F (1929) | 1.25 in (2010) |
| September 7 | 107.1°F (1931) | 33.1°F (1986) | 0.89 in (1970) |
| September 8 | 100.0°F (1931) | 32.0°F (1992) | 1.49 in (2019) |
| September 9 | 100.0°F (1931) | 28.9°F (2020) | 0.85 in (2010) |
| September 10 | 100.9°F (1931) | 27.0°F (1922) | 1.74 in (1961) |
| September 11 | 95.0°F (1948) | 27.0°F (1955) | 1.76 in (2008) |
| September 12 | 93.9°F (1981) | 28.0°F (1989) | 0.83 in (1985) |
| September 13 | 95.0°F (2017) | 28.0°F (1996) | 0.71 in (1921) |
| September 14 | 99.0°F (1948) | 25.0°F (1949) | 1.83 in (1928) |
| September 15 | 100.9°F (1948) | 21.9°F (1916) | 0.72 in (1921) |
| September 16 | 96.1°F (1925) | 26.1°F (1918) | 0.84 in (1965) |
| September 17 | 96.1°F (1955) | 26.1°F (1916) | 0.63 in (1968) |
| September 18 | 98.1°F (1933) | 21.0°F (1929) | 2.16 in (1946) |
| September 19 | 96.1°F (1972) | 18.0°F (1991) | 1.29 in (1996) |
| September 20 | 93.0°F (1972) | 24.1°F (1918) | 1.58 in (1996) |
| September 21 | 99.0°F (1922) | 21.9°F (1913) | 1.71 in (2018) |
| September 22 | 99.0°F (1936) | 19.0°F (1947) | 0.77 in (2008) |
| September 23 | 93.9°F (1958) | 21.9°F (1989) | 1.34 in (1920) |
| September 24 | 91.9°F (1908) | 25.0°F (1985) | 1.52 in (2017) |
| September 25 | 91.0°F (1949) | 17.1°F (1926) | 1.73 in (1915) |
| September 26 | 91.0°F (1979) | 17.1°F (1965) | 0.64 in (1998) |
| September 27 | 97.0°F (1952) | 19.0°F (1942) | 0.70 in (1924) |
| September 28 | 86.0°F (1995) | 19.0°F (1951) | 0.56 in (1971) |
| September 29 | 91.9°F (2021) | 18.0°F (1939) | 0.72 in (1965) |
| September 30 | 91.9°F (2024) | 15.1°F (1974) | 0.49 in (2021) |