May weather in Interior, SD
The average temperature in Interior in May is 58.9°F (45.7°F–72.1°F). Average precipitation: 3.62 inches. Average snowfall is 0.5 inches.
May is a spring month in Interior, and is warmer than the annual average of 50.4°F. Daily temperatures swing about 26.4°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 14h 32m. For travel, May is a comfortable month to visit.
Avg High
72.1°F
Avg Low
45.7°F
Precipitation
3.62 in
Snow
0.5 in
May records in Interior
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (1959) | 19.9°F (1967) | 1.95 in (1983) |
| May 2 | 90.0°F (1959) | 21.9°F (1967) | 1.46 in (1997) |
| May 3 | 93.9°F (1985) | 24.1°F (2005) | 0.86 in (1987) |
| May 4 | 95.0°F (1985) | 26.1°F (2013) | 1.17 in (1961) |
| May 5 | 96.1°F (2004) | 27.0°F (1967) | 3.95 in (2007) |
| May 6 | 93.0°F (2000) | 27.0°F (1976) | 1.14 in (1993) |
| May 7 | 91.9°F (1963) | 30.0°F (1991) | 0.78 in (2015) |
| May 8 | 95.0°F (1985) | 27.0°F (2010) | 1.84 in (2014) |
| May 9 | 95.0°F (1962) | 30.0°F (2021) | 1.37 in (1965) |
| May 10 | 93.9°F (1961) | 28.9°F (1979) | 1.67 in (2015) |
| May 11 | 97.0°F (2025) | 27.0°F (1979) | 0.81 in (1972) |
| May 12 | 98.1°F (2025) | 28.0°F (1983) | 1.75 in (2005) |
| May 13 | 97.0°F (2025) | 26.1°F (1978) | 1.82 in (1982) |
| May 14 | 93.9°F (2001) | 27.0°F (2016) | 1.86 in (1965) |
| May 15 | 90.0°F (1987) | 30.9°F (2005) | 2.54 in (1991) |
| May 16 | 91.9°F (1979) | 34.0°F (1969) | 1.50 in (2015) |
| May 17 | 96.1°F (1988) | 34.0°F (1969) | 1.55 in (2015) |
| May 18 | 93.9°F (1988) | 33.1°F (1983) | 0.35 in (1962) |
| May 19 | 98.1°F (1992) | 34.0°F (1997) | 1.67 in (2013) |
| May 20 | 96.1°F (1992) | 28.0°F (2003) | 2.00 in (1982) |
| May 21 | 91.9°F (1966) | 34.0°F (2017) | 1.80 in (1998) |
| May 22 | 98.1°F (2012) | 30.0°F (2022) | 1.28 in (2019) |
| May 23 | 91.9°F (2006) | 34.0°F (1959) | 1.98 in (2018) |
| May 24 | 89.1°F (1967) | 33.1°F (2017) | 1.49 in (1965) |
| May 25 | 89.1°F (1967) | 35.1°F (2002) | 1.29 in (1960) |
| May 26 | 97.0°F (1969) | 34.0°F (1992) | 1.54 in (2024) |
| May 27 | 102.0°F (1969) | 35.1°F (1965) | 2.75 in (1996) |
| May 28 | 98.1°F (1969) | 36.0°F (1965) | 1.67 in (1978) |
| May 29 | 93.9°F (1958) | 37.9°F (2021) | 1.13 in (1962) |
| May 30 | 97.0°F (1969) | 35.1°F (1975) | 1.01 in (1971) |
| May 31 | 93.9°F (1969) | 35.1°F (2015) | 1.39 in (1963) |