October weather in Mount Vernon, SD
The average temperature in Mount Vernon in October is 49.7°F (37.8°F–61.7°F). Average precipitation: 1.83 inches.
October is a fall month in Mount Vernon, and is warmer than the annual average of 47.7°F. Daily temperatures swing about 23.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 10h 46m. For travel, October is cool.
Avg High
61.7°F
Avg Low
37.8°F
Precipitation
1.83 in
Daylight
10h 46m
October records in Mount Vernon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 93.0°F (2023) | 28.0°F (2003) | 2.22 in (2017) |
| October 2 | 91.0°F (2023) | 23.0°F (1999) | 0.48 in (2017) |
| October 3 | 91.0°F (2025) | 31.1°F (2014) | 0.78 in (2023) |
| October 4 | 91.9°F (2025) | 28.2°F (2018) | 1.33 in (2016) |
| October 5 | 87.1°F (2011) | 27.0°F (2000) | 0.79 in (2009) |
| October 6 | 91.0°F (2007) | 23.0°F (2001) | 1.08 in (2008) |
| October 7 | 88.0°F (2003) | 21.9°F (2000) | 0.95 in (2011) |
| October 8 | 87.1°F (2010) | 17.1°F (2000) | 0.60 in (2011) |
| October 9 | 88.0°F (2020) | 25.0°F (2000) | 1.03 in (2018) |
| October 10 | 88.0°F (2015) | 23.2°F (2009) | 0.59 in (2019) |
| October 11 | 93.0°F (2015) | 22.1°F (2009) | 1.29 in (2003) |
| October 12 | 81.0°F (2025) | 24.3°F (2006) | 1.41 in (2023) |
| October 13 | 77.0°F (2015) | 27.1°F (2006) | 0.74 in (2023) |
| October 14 | 75.9°F (2016) | 23.2°F (2006) | 2.76 in (2013) |
| October 15 | 78.1°F (2012) | 24.3°F (2018) | 1.03 in (2007) |
| October 16 | 78.1°F (2005) | 21.9°F (2001) | 0.22 in (2025) |
| October 17 | 80.1°F (2017) | 18.1°F (2022) | 0.49 in (2007) |
| October 18 | 86.0°F (2003) | 12.2°F (2022) | 0.58 in (2012) |
| October 19 | 88.0°F (2000) | 19.2°F (2022) | 0.08 in (2024) |
| October 20 | 82.9°F (2024) | 24.3°F (2011) | 0.80 in (2021) |
| October 21 | 82.9°F (2003) | 30.0°F (2002) | 0.57 in (2008) |
| October 22 | 86.0°F (2003) | 23.2°F (2006) | 0.87 in (2008) |
| October 23 | 87.1°F (2022) | 18.1°F (2006) | 0.91 in (2015) |
| October 24 | 79.0°F (2014) | 17.2°F (2020) | 0.19 in (2021) |
| October 25 | 73.0°F (2000) | 11.1°F (2020) | 0.47 in (2010) |
| October 26 | 70.0°F (2014) | 10.2°F (2020) | 0.09 in (2010) |
| October 27 | 80.1°F (1999) | 7.2°F (2020) | 1.38 in (2021) |
| October 28 | 82.0°F (2016) | 14.2°F (2017) | 0.05 in (2004) |
| October 29 | 75.9°F (2006) | 20.1°F (2019) | 0.27 in (2009) |
| October 30 | 73.9°F (2007) | 16.0°F (2002) | 0.41 in (2009) |
| October 31 | 75.0°F (1999) | 12.0°F (2002) | 1.78 in (2000) |