September weather in Oacoma, SD
The average temperature in Oacoma in September is 64.3°F (51.2°F–77.4°F). Average precipitation: 2.13 inches.
September is a fall month in Oacoma, and is warmer than the annual average of 48.2°F. Daily temperatures swing about 26.2°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
77.4°F
Avg Low
51.2°F
Precipitation
2.13 in
Daylight
12h 17m
September records in Oacoma
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (2012) | 50.0°F (2010) | 2.64 in (2008) |
| September 2 | 102.9°F (2023) | 48.0°F (2008) | 0.63 in (2021) |
| September 3 | 102.0°F (2023) | 42.1°F (2008) | 0.78 in (1999) |
| September 4 | 102.9°F (2001) | 43.0°F (2025) | 0.53 in (1999) |
| September 5 | 100.9°F (1998) | 42.1°F (2025) | 0.31 in (2004) |
| September 6 | 97.0°F (2003) | 37.9°F (2025) | 0.71 in (2007) |
| September 7 | 96.1°F (2002) | 37.0°F (2025) | 0.27 in (2023) |
| September 8 | 99.0°F (2022) | 37.0°F (2020) | 0.76 in (2009) |
| September 9 | 100.0°F (2005) | 37.0°F (2020) | 0.38 in (2002) |
| September 10 | 100.9°F (1998) | 39.0°F (2020) | 0.18 in (2003) |
| September 11 | 95.0°F (2005) | 41.0°F (2023) | 0.13 in (2009) |
| September 12 | 100.9°F (2004) | 43.0°F (2000) | 0.11 in (2008) |
| September 13 | 93.9°F (2000) | 42.1°F (1999) | 1.47 in (2001) |
| September 14 | 93.9°F (2022) | 34.0°F (2007) | 1.07 in (2001) |
| September 15 | 93.9°F (2012) | 37.0°F (2011) | 0.83 in (2005) |
| September 16 | 96.1°F (2003) | 39.9°F (2023) | 0.39 in (2006) |
| September 17 | 97.0°F (2000) | 36.0°F (2012) | 2.01 in (2025) |
| September 18 | 98.1°F (2013) | 37.0°F (2012) | 0.32 in (2005) |
| September 19 | 93.9°F (2023) | 37.0°F (2006) | 0.20 in (1999) |
| September 20 | 95.0°F (2007) | 35.1°F (2006) | 0.56 in (2004) |
| September 21 | 91.0°F (2005) | 39.0°F (1999) | 1.53 in (2023) |
| September 22 | 90.0°F (2013) | 30.2°F (2012) | 0.59 in (2004) |
| September 23 | 93.9°F (2007) | 35.1°F (2000) | 0.96 in (2006) |
| September 24 | 84.0°F (2012) | 28.9°F (2000) | 0.91 in (2005) |
| September 25 | 89.1°F (2008) | 33.1°F (2000) | 0.72 in (2005) |
| September 26 | 89.1°F (2024) | 37.9°F (2000) | 0.03 in (2003) |
| September 27 | 90.0°F (2021) | 32.0°F (1999) | 0.70 in (2013) |
| September 28 | 95.0°F (2011) | 35.1°F (2006) | 0.21 in (2002) |
| September 29 | 90.0°F (2007) | 34.0°F (1999) | 0.57 in (2021) |
| September 30 | 90.0°F (2013) | 30.9°F (2003) | 1.64 in (2004) |