September weather in Hill City, SD
The average temperature in Hill City in September is 56.2°F (38.5°F–73.8°F). Average precipitation: 1.54 inches. Average snowfall is 1.0 inches.
September is a fall month in Hill City, and is warmer than the annual average of 43.9°F. Daily temperatures swing about 35.3°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
73.8°F
Avg Low
38.5°F
Precipitation
1.54 in
Snow
1.0 in
September records in Hill City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 89.1°F (2012) | 27.0°F (1974) | 1.56 in (1986) |
| September 2 | 93.0°F (2022) | 24.1°F (1974) | 0.97 in (1973) |
| September 3 | 93.0°F (2019) | 25.0°F (1974) | 0.60 in (1968) |
| September 4 | 96.1°F (2024) | 32.0°F (1989) | 0.68 in (2004) |
| September 5 | 96.1°F (2022) | 26.1°F (2017) | 1.10 in (1986) |
| September 6 | 98.1°F (2020) | 24.1°F (2025) | 0.63 in (1986) |
| September 7 | 90.0°F (2013) | 27.0°F (2010) | 0.31 in (2001) |
| September 8 | 97.0°F (2022) | 21.9°F (1976) | 1.29 in (1989) |
| September 9 | 90.0°F (1998) | 16.0°F (2020) | 1.77 in (2002) |
| September 10 | 93.0°F (2024) | 17.1°F (2020) | 0.89 in (1985) |
| September 11 | 95.0°F (2021) | 18.0°F (1989) | 0.47 in (2014) |
| September 12 | 90.0°F (2025) | 18.0°F (2014) | 1.02 in (2009) |
| September 13 | 91.0°F (2018) | 18.0°F (2014) | 0.63 in (2009) |
| September 14 | 88.0°F (2015) | 16.0°F (1993) | 1.02 in (2001) |
| September 15 | 88.0°F (2020) | 27.0°F (1999) | 0.24 in (2016) |
| September 16 | 88.0°F (2018) | 28.0°F (1972) | 1.12 in (1980) |
| September 17 | 91.9°F (2000) | 28.9°F (1997) | 0.31 in (1959) |
| September 18 | 87.1°F (2004) | 16.0°F (1991) | 0.84 in (2002) |
| September 19 | 95.0°F (1972) | 15.1°F (1991) | 0.62 in (1964) |
| September 20 | 86.0°F (2020) | 18.0°F (1974) | 0.63 in (1998) |
| September 21 | 81.0°F (2016) | 19.9°F (1974) | 1.94 in (1989) |
| September 22 | 84.9°F (2013) | 16.0°F (1995) | 1.16 in (1909) |
| September 23 | 87.1°F (2020) | 21.0°F (1972) | 0.85 in (2006) |
| September 24 | 84.9°F (2018) | 19.0°F (2000) | 1.21 in (1986) |
| September 25 | 87.1°F (2020) | 12.0°F (1972) | 1.05 in (1959) |
| September 26 | 87.1°F (2024) | 17.1°F (1996) | 0.42 in (1966) |
| September 27 | 93.0°F (2024) | 19.0°F (1974) | 0.49 in (1986) |
| September 28 | 88.0°F (2010) | 21.9°F (1976) | 1.10 in (1971) |
| September 29 | 87.1°F (2024) | 19.9°F (1974) | 0.73 in (2014) |
| September 30 | 91.0°F (2024) | 24.1°F (1974) | 2.62 in (2014) |