May weather in Grand Marais, MN
The average temperature in Grand Marais in May is 45.4°F (37.4°F–53.4°F). Average precipitation: 2.61 inches.
May is a spring month in Grand Marais, and is warmer than the annual average of 38.3°F. Daily temperatures swing about 16°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 14h 56m. For travel, May is cool.
Avg High
53.4°F
Avg Low
37.4°F
Precipitation
2.61 in
Daylight
14h 56m
May records in Grand Marais
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 84.0°F (1918) | 21.9°F (1966) | 1.90 in (1954) |
| May 2 | 72.0°F (2021) | 23.0°F (1924) | 0.85 in (1928) |
| May 3 | 80.1°F (1918) | 19.0°F (1967) | 1.31 in (2008) |
| May 4 | 75.0°F (2015) | 19.0°F (1954) | 1.21 in (1960) |
| May 5 | 73.9°F (1918) | 23.0°F (1989) | 2.78 in (1950) |
| May 6 | 80.1°F (1934) | 26.1°F (1944) | 0.91 in (1964) |
| May 7 | 80.1°F (2025) | 21.0°F (1947) | 0.72 in (1999) |
| May 8 | 87.1°F (1953) | 18.0°F (1947) | 1.01 in (2000) |
| May 9 | 79.0°F (1987) | 17.1°F (1947) | 1.46 in (1950) |
| May 10 | 84.9°F (2007) | 24.1°F (1945) | 1.64 in (1979) |
| May 11 | 84.9°F (2007) | 25.0°F (1950) | 1.72 in (1974) |
| May 12 | 80.1°F (1993) | 25.0°F (1918) | 1.23 in (1944) |
| May 13 | 75.9°F (2024) | 24.1°F (1953) | 1.05 in (1942) |
| May 14 | 79.0°F (1944) | 26.1°F (1920) | 1.33 in (2010) |
| May 15 | 80.1°F (1958) | 26.1°F (1942) | 1.51 in (1969) |
| May 16 | 82.0°F (1931) | 21.9°F (2002) | 0.98 in (2025) |
| May 17 | 75.0°F (1917) | 24.1°F (1925) | 1.10 in (1987) |
| May 18 | 79.0°F (1925) | 25.0°F (2002) | 1.93 in (1996) |
| May 19 | 79.0°F (1984) | 25.0°F (1924) | 0.74 in (1940) |
| May 20 | 84.9°F (1948) | 26.1°F (2002) | 1.76 in (2013) |
| May 21 | 80.1°F (1948) | 26.1°F (1949) | 1.52 in (1953) |
| May 22 | 80.1°F (1948) | 24.1°F (1947) | 2.45 in (2024) |
| May 23 | 77.0°F (1988) | 26.1°F (1931) | 2.25 in (1964) |
| May 24 | 79.0°F (2010) | 25.0°F (1949) | 1.31 in (1971) |
| May 25 | 80.1°F (1952) | 26.1°F (1913) | 2.12 in (2012) |
| May 26 | 82.0°F (1966) | 28.0°F (1918) | 0.79 in (1956) |
| May 27 | 84.0°F (2014) | 24.1°F (1947) | 0.87 in (1968) |
| May 28 | 79.0°F (2015) | 30.0°F (2008) | 0.81 in (2016) |
| May 29 | 88.0°F (1986) | 28.0°F (1949) | 1.31 in (1978) |
| May 30 | 87.1°F (1986) | 28.9°F (2023) | 0.99 in (2003) |
| May 31 | 86.0°F (2002) | 30.0°F (1947) | 1.89 in (2004) |