May weather in Rapid City, SD
The average temperature in Rapid City in May is 54.9°F (44.6°F–65.3°F). Average precipitation: 4.12 inches. Average snowfall is 2.2 inches.
May is a spring month in Rapid City, and is warmer than the annual average of 48°F. Daily temperatures swing about 20.7°F between overnight low and afternoon high. Expect about 14 days with precipitation. Daylight averages about 14h 34m. For travel, May is a comfortable month to visit.
Avg High
65.3°F
Avg Low
44.6°F
Precipitation
4.12 in
Snow
2.2 in
May records in Rapid City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 78.1°F (2021) | 27.0°F (2002) | 1.41 in (1997) |
| May 2 | 82.9°F (2015) | 25.0°F (2008) | 1.46 in (2008) |
| May 3 | 80.1°F (1998) | 28.0°F (2005) | 0.28 in (2020) |
| May 4 | 80.1°F (2025) | 33.1°F (1996) | 0.34 in (2015) |
| May 5 | 91.9°F (2000) | 33.1°F (1996) | 1.61 in (2007) |
| May 6 | 87.1°F (2017) | 30.0°F (2010) | 0.35 in (2010) |
| May 7 | 84.9°F (2017) | 30.0°F (2002) | 0.60 in (2014) |
| May 8 | 84.0°F (2004) | 30.0°F (2010) | 0.46 in (2022) |
| May 9 | 82.0°F (2023) | 28.0°F (1996) | 1.26 in (2015) |
| May 10 | 89.1°F (2025) | 28.0°F (1996) | 1.69 in (2010) |
| May 11 | 95.0°F (2025) | 26.1°F (2008) | 1.66 in (2023) |
| May 12 | 93.9°F (2025) | 28.9°F (2005) | 0.74 in (2023) |
| May 13 | 93.9°F (2001) | 28.9°F (2004) | 0.51 in (2020) |
| May 14 | 84.0°F (2012) | 28.0°F (2004) | 0.79 in (2023) |
| May 15 | 84.9°F (2019) | 30.9°F (2005) | 1.44 in (2015) |
| May 16 | 90.0°F (2012) | 32.0°F (2009) | 0.35 in (2004) |
| May 17 | 87.1°F (2024) | 37.9°F (2004) | 1.29 in (2000) |
| May 18 | 87.1°F (2009) | 33.1°F (2019) | 0.60 in (2012) |
| May 19 | 93.0°F (2009) | 32.0°F (2019) | 2.19 in (2011) |
| May 20 | 84.0°F (2005) | 30.9°F (2019) | 0.60 in (2011) |
| May 21 | 86.0°F (2012) | 30.9°F (2019) | 1.97 in (2019) |
| May 22 | 89.1°F (2006) | 30.9°F (2019) | 3.03 in (2008) |
| May 23 | 82.9°F (2023) | 30.9°F (2002) | 1.64 in (1996) |
| May 24 | 78.1°F (2023) | 28.9°F (2002) | 2.17 in (2009) |
| May 25 | 82.9°F (2013) | 36.0°F (2004) | 2.65 in (1997) |
| May 26 | 91.0°F (2006) | 33.1°F (2008) | 1.25 in (1996) |
| May 27 | 93.0°F (2022) | 33.1°F (2008) | 1.57 in (1996) |
| May 28 | 89.1°F (2010) | 37.0°F (2008) | 1.81 in (2019) |
| May 29 | 90.0°F (2003) | 39.0°F (2005) | 2.25 in (2013) |
| May 30 | 84.9°F (2002) | 39.0°F (2015) | 1.25 in (1996) |
| May 31 | 84.0°F (2020) | 42.1°F (2005) | 1.46 in (2006) |