August weather in Grand Marais, MN
The average temperature in Grand Marais in August is 61.8°F (54.0°F–69.5°F). Average precipitation: 2.56 inches.
August is a summer month in Grand Marais, and is warmer than the annual average of 38.3°F. Daily temperatures swing about 15.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 14h 5m. For travel, August is one of the best months of the year to visit.
Avg High
69.5°F
Avg Low
54.0°F
Precipitation
2.56 in
Daylight
14h 5m
August records in Grand Marais
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 91.9°F (2006) | 33.1°F (1947) | 2.93 in (1987) |
| August 2 | 93.9°F (1951) | 39.0°F (1950) | 0.73 in (1932) |
| August 3 | 89.1°F (2024) | 43.0°F (1950) | 2.00 in (1937) |
| August 4 | 87.1°F (1930) | 39.9°F (1950) | 1.05 in (1917) |
| August 5 | 88.0°F (1930) | 41.0°F (1927) | 1.63 in (1900) |
| August 6 | 90.0°F (1930) | 42.1°F (1951) | 2.00 in (1900) |
| August 7 | 100.0°F (1930) | 42.1°F (1913) | 1.19 in (1957) |
| August 8 | 88.0°F (2001) | 39.9°F (1927) | 1.62 in (2001) |
| August 9 | 90.0°F (1936) | 43.0°F (1927) | 2.35 in (1939) |
| August 10 | 88.0°F (1998) | 39.9°F (1947) | 1.30 in (1948) |
| August 11 | 86.0°F (1941) | 39.9°F (1924) | 0.75 in (1953) |
| August 12 | 87.1°F (2006) | 42.1°F (1930) | 0.88 in (1985) |
| August 13 | 84.0°F (1925) | 41.0°F (1964) | 1.08 in (1945) |
| August 14 | 87.1°F (1965) | 41.0°F (1913) | 1.12 in (1950) |
| August 15 | 86.0°F (2008) | 41.0°F (1927) | 1.06 in (1968) |
| August 16 | 86.0°F (2008) | 39.0°F (1927) | 1.85 in (1972) |
| August 17 | 87.1°F (1922) | 39.0°F (1924) | 2.64 in (1988) |
| August 18 | 88.0°F (1931) | 39.0°F (1924) | 1.21 in (1946) |
| August 19 | 84.9°F (1934) | 42.1°F (1929) | 1.43 in (2015) |
| August 20 | 88.0°F (1955) | 36.0°F (1950) | 2.00 in (1938) |
| August 21 | 82.0°F (1913) | 39.9°F (1950) | 1.68 in (1974) |
| August 22 | 90.0°F (1930) | 39.9°F (2009) | 0.94 in (1966) |
| August 23 | 86.0°F (1930) | 37.0°F (2009) | 1.80 in (1988) |
| August 24 | 89.1°F (1930) | 37.0°F (1934) | 1.15 in (1945) |
| August 25 | 91.9°F (1930) | 37.9°F (1934) | 2.28 in (1959) |
| August 26 | 88.0°F (1924) | 34.0°F (1915) | 0.82 in (1974) |
| August 27 | 87.1°F (1953) | 34.0°F (1915) | 0.95 in (1948) |
| August 28 | 86.0°F (1913) | 35.1°F (1982) | 2.10 in (2008) |
| August 29 | 87.1°F (1948) | 37.0°F (1934) | 1.42 in (2015) |
| August 30 | 90.0°F (1991) | 39.0°F (1915) | 2.34 in (1980) |
| August 31 | 90.0°F (1991) | 37.9°F (1935) | 2.61 in (1977) |