May weather in Mount Vernon, SD
The average temperature in Mount Vernon in May is 59.3°F (47.8°F–70.8°F). Average precipitation: 3.15 inches.
May is a spring month in Mount Vernon, and is warmer than the annual average of 47.7°F. Daily temperatures swing about 23°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 32m. For travel, May is a comfortable month to visit.
Avg High
70.8°F
Avg Low
47.8°F
Precipitation
3.15 in
Daylight
14h 32m
May records in Mount Vernon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.9°F (2021) | 30.0°F (2002) | 0.30 in (2008) |
| May 2 | 84.9°F (2015) | 26.1°F (2005) | 0.12 in (2008) |
| May 3 | 84.9°F (2000) | 20.1°F (2013) | 0.10 in (2024) |
| May 4 | 89.1°F (2000) | 30.9°F (2005) | 1.44 in (2012) |
| May 5 | 95.0°F (2004) | 31.1°F (2006) | 3.03 in (2012) |
| May 6 | 89.1°F (2016) | 31.1°F (2021) | 1.37 in (2015) |
| May 7 | 88.0°F (2017) | 33.1°F (2021) | 0.74 in (2000) |
| May 8 | 84.0°F (2004) | 31.1°F (2020) | 1.19 in (2003) |
| May 9 | 91.0°F (2004) | 34.0°F (2009) | 0.35 in (2011) |
| May 10 | 88.0°F (2025) | 28.9°F (2002) | 1.45 in (2015) |
| May 11 | 90.0°F (2025) | 29.1°F (2020) | 0.84 in (2005) |
| May 12 | 91.0°F (2022) | 30.2°F (2013) | 0.65 in (2004) |
| May 13 | 93.0°F (2013) | 33.1°F (2004) | 0.59 in (2023) |
| May 14 | 95.0°F (2001) | 28.9°F (2004) | 0.26 in (2025) |
| May 15 | 86.0°F (2001) | 27.1°F (2014) | 1.35 in (2025) |
| May 16 | 84.9°F (2018) | 31.1°F (2014) | 2.50 in (2004) |
| May 17 | 93.0°F (2012) | 30.9°F (2002) | 1.00 in (2000) |
| May 18 | 93.0°F (2012) | 28.9°F (2002) | 0.75 in (2000) |
| May 19 | 98.1°F (2009) | 28.9°F (2002) | 0.61 in (2025) |
| May 20 | 91.0°F (2009) | 34.0°F (2002) | 0.95 in (2013) |
| May 21 | 88.0°F (2005) | 34.0°F (2022) | 1.34 in (2024) |
| May 22 | 91.0°F (2010) | 33.1°F (2022) | 0.74 in (2007) |
| May 23 | 93.0°F (2006) | 39.0°F (2022) | 0.48 in (2008) |
| May 24 | 91.0°F (2010) | 36.0°F (2002) | 0.73 in (2008) |
| May 25 | 91.9°F (2018) | 41.0°F (2000) | 0.51 in (2016) |
| May 26 | 96.1°F (2018) | 36.0°F (2022) | 0.61 in (2014) |
| May 27 | 97.0°F (2018) | 42.1°F (2007) | 0.64 in (2021) |
| May 28 | 99.0°F (2006) | 41.0°F (2000) | 1.59 in (2016) |
| May 29 | 93.0°F (2010) | 42.1°F (2005) | 0.64 in (2013) |
| May 30 | 96.1°F (2002) | 39.9°F (2012) | 1.48 in (2004) |
| May 31 | 91.0°F (2023) | 42.1°F (2015) | 0.99 in (2014) |