May weather in Mandan, ND
The average temperature in Mandan in May is 54.5°F (42.6°F–66.5°F). Average precipitation: 2.59 inches.
May is a spring month in Mandan, and is warmer than the annual average of 42.4°F. Daily temperatures swing about 23.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 14h 50m. For travel, May is a comfortable month to visit.
Avg High
66.5°F
Avg Low
42.6°F
Precipitation
2.59 in
Daylight
14h 50m
May records in Mandan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (1992) | 19.9°F (1961) | 1.51 in (1949) |
| May 2 | 84.9°F (1955) | 19.0°F (1967) | 0.79 in (1935) |
| May 3 | 91.9°F (1955) | 12.9°F (1967) | 0.86 in (1919) |
| May 4 | 95.0°F (1926) | 16.0°F (1967) | 1.19 in (1999) |
| May 5 | 98.1°F (1926) | 17.1°F (1944) | 1.65 in (1914) |
| May 6 | 88.0°F (1916) | 19.0°F (1931) | 1.09 in (1965) |
| May 7 | 91.0°F (1934) | 21.0°F (1929) | 1.01 in (1995) |
| May 8 | 96.1°F (1934) | 19.0°F (1945) | 1.46 in (1927) |
| May 9 | 89.1°F (1985) | 21.0°F (1966) | 1.88 in (1927) |
| May 10 | 89.1°F (1992) | 24.1°F (1945) | 0.68 in (1999) |
| May 11 | 93.9°F (2025) | 19.9°F (2020) | 0.93 in (1956) |
| May 12 | 93.9°F (2025) | 23.0°F (1918) | 2.86 in (1985) |
| May 13 | 91.0°F (1932) | 25.0°F (1937) | 0.70 in (2010) |
| May 14 | 90.0°F (1977) | 24.1°F (1953) | 1.34 in (2003) |
| May 15 | 93.0°F (1936) | 23.0°F (2014) | 2.02 in (1915) |
| May 16 | 93.9°F (1934) | 23.0°F (1925) | 2.28 in (2025) |
| May 17 | 93.0°F (1934) | 26.1°F (1930) | 1.12 in (1962) |
| May 18 | 98.1°F (1941) | 26.1°F (1915) | 1.22 in (2013) |
| May 19 | 93.0°F (1948) | 25.0°F (2015) | 1.02 in (2013) |
| May 20 | 89.1°F (1925) | 23.0°F (1931) | 1.61 in (2025) |
| May 21 | 93.9°F (1925) | 26.1°F (1963) | 1.88 in (1987) |
| May 22 | 95.0°F (1980) | 24.1°F (1963) | 1.92 in (1995) |
| May 23 | 95.0°F (1928) | 28.0°F (1917) | 1.97 in (2011) |
| May 24 | 97.0°F (1926) | 25.0°F (1924) | 1.35 in (1973) |
| May 25 | 95.0°F (1941) | 23.0°F (1924) | 0.94 in (2008) |
| May 26 | 93.0°F (1934) | 26.1°F (1984) | 1.70 in (1932) |
| May 27 | 100.9°F (1934) | 28.0°F (1917) | 0.97 in (1929) |
| May 28 | 102.0°F (1934) | 23.0°F (1947) | 1.47 in (1931) |
| May 29 | 98.1°F (1934) | 25.0°F (1947) | 1.43 in (1985) |
| May 30 | 102.0°F (1934) | 30.0°F (1947) | 1.38 in (2013) |
| May 31 | 91.9°F (1936) | 28.9°F (1964) | 1.72 in (2007) |