May weather in Custer, SD
The average temperature in Custer in May is 50.8°F (40.5°F–61.2°F). Average precipitation: 3.53 inches. Average snowfall is 2.1 inches.
May is a spring month in Custer, and is warmer than the annual average of 44.9°F. Daily temperatures swing about 20.7°F between overnight low and afternoon high. Expect about 14 days with precipitation. Daylight averages about 14h 32m. For travel, May is a comfortable month to visit.
Avg High
61.2°F
Avg Low
40.5°F
Precipitation
3.53 in
Snow
2.1 in
May records in Custer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 77.0°F (1968) | 10.0°F (1950) | 2.33 in (1946) |
| May 2 | 81.0°F (1959) | 15.1°F (1954) | 2.22 in (1946) |
| May 3 | 81.0°F (1952) | 5.0°F (1954) | 1.54 in (1920) |
| May 4 | 81.0°F (1952) | 19.0°F (2024) | 1.41 in (1978) |
| May 5 | 82.0°F (1966) | 14.0°F (1944) | 1.10 in (2007) |
| May 6 | 82.9°F (2000) | 19.0°F (1960) | 1.23 in (1927) |
| May 7 | 82.0°F (1966) | 19.0°F (1951) | 2.56 in (1995) |
| May 8 | 79.0°F (2004) | 18.0°F (2010) | 0.79 in (2022) |
| May 9 | 78.1°F (1992) | 19.0°F (1968) | 1.40 in (1971) |
| May 10 | 82.0°F (1962) | 23.0°F (1946) | 1.20 in (1920) |
| May 11 | 81.0°F (1961) | 12.9°F (1953) | 1.67 in (1930) |
| May 12 | 81.0°F (2025) | 9.0°F (1953) | 1.56 in (1995) |
| May 13 | 82.0°F (1960) | 17.1°F (1966) | 0.81 in (1928) |
| May 14 | 81.0°F (1944) | 19.0°F (2023) | 0.66 in (1935) |
| May 15 | 84.0°F (1976) | 21.0°F (1953) | 2.93 in (1925) |
| May 16 | 82.0°F (2012) | 25.0°F (1945) | 1.10 in (1969) |
| May 17 | 82.9°F (1948) | 23.0°F (1968) | 1.16 in (1981) |
| May 18 | 84.9°F (1992) | 17.1°F (2023) | 1.65 in (1978) |
| May 19 | 84.9°F (1992) | 21.0°F (1966) | 1.48 in (2011) |
| May 20 | 86.0°F (1954) | 21.0°F (1968) | 1.14 in (1982) |
| May 21 | 87.1°F (1954) | 15.1°F (1963) | 2.30 in (2019) |
| May 22 | 86.0°F (1964) | 19.9°F (1963) | 4.03 in (1952) |
| May 23 | 84.0°F (1972) | 21.9°F (1959) | 2.01 in (1933) |
| May 24 | 81.0°F (1967) | 21.9°F (1966) | 1.41 in (1997) |
| May 25 | 88.0°F (1972) | 24.1°F (1984) | 2.41 in (1960) |
| May 26 | 88.0°F (1972) | 23.0°F (1950) | 1.58 in (1963) |
| May 27 | 84.9°F (1969) | 21.9°F (1973) | 1.85 in (2018) |
| May 28 | 90.0°F (1969) | 23.0°F (1947) | 0.80 in (1978) |
| May 29 | 87.1°F (2003) | 19.9°F (1947) | 1.35 in (1982) |
| May 30 | 88.0°F (2003) | 25.0°F (1947) | 2.53 in (1943) |
| May 31 | 82.0°F (1966) | 28.0°F (1982) | 1.82 in (1922) |