May weather in Castlewood, SD

The average temperature in Castlewood in May is 55.5°F (43.6°F–67.3°F). Average precipitation: 3.18 inches.

May is a spring month in Castlewood, and is warmer than the annual average of 42.7°F. Daily temperatures swing about 23.7°F between overnight low and afternoon high. Daylight averages about 14h 38m. For travel, May is a comfortable month to visit.

Avg High
67.3°F
Avg Low
43.6°F
Precipitation
3.18 in
Daylight
14h 38m

May records in Castlewood

Date Record High Record Low Record Precip
May 1 80.1°F (2018) 24.1°F (2013) 0.31 in (2024)
May 2 86.0°F (2021) 25.0°F (2013) 0.20 in (2024)
May 3 82.0°F (2015) 18.0°F (2013) 0.06 in (2024)
May 4 75.9°F (2012) 19.9°F (2013) 0.71 in (2024)
May 5 78.1°F (2018) 25.0°F (2013) 1.07 in (2012)
May 6 82.0°F (2016) 28.0°F (2013) 0.85 in (2012)
May 7 91.0°F (2016) 28.0°F (2021) 0.81 in (2024)
May 8 82.9°F (2017) 28.0°F (2021) 0.80 in (2022)
May 9 79.0°F (2017) 28.9°F (2020) 0.81 in (2019)
May 10 84.0°F (2025) 27.0°F (2019) 0.19 in (2016)
May 11 84.0°F (2025) 27.0°F (2021) 0.89 in (2016)
May 12 89.1°F (2025) 21.9°F (2013) 2.04 in (2022)
May 13 88.0°F (2025) 28.9°F (2020) 0.62 in (2014)
May 14 88.0°F (2013) 28.0°F (2016) 0.21 in (2021)
May 15 91.0°F (2013) 28.0°F (2014) 0.55 in (2025)
May 16 84.0°F (2012) 23.0°F (2014) 0.46 in (2025)
May 17 84.0°F (2018) 33.1°F (2014) 0.58 in (2015)
May 18 88.0°F (2012) 32.0°F (2015) 0.91 in (2017)
May 19 91.0°F (2012) 33.1°F (2015) 0.28 in (2013)
May 20 78.1°F (2012) 30.0°F (2023) 0.70 in (2025)
May 21 80.1°F (2014) 35.1°F (2017) 0.72 in (2017)
May 22 82.9°F (2016) 32.0°F (2022) 1.73 in (2024)
May 23 86.0°F (2012) 34.0°F (2017) 0.30 in (2016)
May 24 84.9°F (2018) 37.9°F (2017) 0.47 in (2020)
May 25 89.1°F (2018) 39.9°F (2017) 0.96 in (2015)
May 26 90.0°F (2018) 39.0°F (2019) 0.45 in (2016)
May 27 91.9°F (2018) 41.0°F (2022) 0.21 in (2013)
May 28 98.1°F (2018) 39.0°F (2021) 0.60 in (2021)
May 29 89.1°F (2018) 37.9°F (2021) 0.75 in (2016)
May 30 88.0°F (2014) 37.0°F (2012) 0.51 in (2013)
May 31 91.0°F (2014) 37.0°F (2015) 0.88 in (2022)

Other months in Castlewood