August weather in Great Falls, MT
The average temperature in Great Falls in August is 68.7°F (53.4°F–83.9°F). Average precipitation: 1.30 inches.
August is a summer month in Great Falls, and is warmer than the annual average of 47°F. Daily temperatures swing about 30.5°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 14h 4m. For travel, August is a comfortable month to visit.
Avg High
83.9°F
Avg Low
53.4°F
Precipitation
1.30 in
Daylight
14h 4m
August records in Great Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 102.9°F (1955) | 43.0°F (1893) | 1.62 in (2025) |
| August 2 | 99.0°F (1893) | 43.0°F (1923) | 0.74 in (2013) |
| August 3 | 99.0°F (1892) | 41.0°F (1896) | 0.24 in (1919) |
| August 4 | 100.0°F (2024) | 43.0°F (1923) | 0.73 in (1911) |
| August 5 | 99.0°F (1893) | 42.1°F (1924) | 0.25 in (1916) |
| August 6 | 99.0°F (1893) | 41.0°F (1896) | 0.19 in (1918) |
| August 7 | 98.1°F (1930) | 35.1°F (1893) | 0.45 in (2009) |
| August 8 | 100.0°F (2012) | 41.0°F (1893) | 0.39 in (1931) |
| August 9 | 102.0°F (1936) | 37.9°F (1893) | 2.26 in (2016) |
| August 10 | 102.0°F (1897) | 39.9°F (1924) | 1.45 in (1907) |
| August 11 | 99.0°F (2018) | 37.0°F (1893) | 0.43 in (1918) |
| August 12 | 96.1°F (1906) | 41.0°F (1908) | 0.23 in (1918) |
| August 13 | 99.0°F (2015) | 39.9°F (1896) | 1.07 in (1908) |
| August 14 | 100.0°F (1892) | 43.0°F (1928) | 0.86 in (1908) |
| August 15 | 97.0°F (1920) | 42.1°F (1893) | 1.58 in (1927) |
| August 16 | 98.1°F (2013) | 39.9°F (1893) | 0.14 in (1902) |
| August 17 | 98.1°F (1919) | 39.9°F (1910) | 0.38 in (2006) |
| August 18 | 99.0°F (1919) | 42.1°F (1925) | 0.60 in (1912) |
| August 19 | 97.0°F (1953) | 39.9°F (1913) | 1.21 in (1912) |
| August 20 | 100.9°F (1953) | 39.0°F (1916) | 0.79 in (1923) |
| August 21 | 99.0°F (1894) | 39.0°F (1892) | 2.72 in (1933) |
| August 22 | 98.1°F (1935) | 39.9°F (1892) | 1.59 in (1933) |
| August 23 | 98.1°F (1930) | 37.9°F (2015) | 2.56 in (2014) |
| August 24 | 98.1°F (1926) | 34.0°F (1910) | 0.87 in (2014) |
| August 25 | 100.0°F (1926) | 35.1°F (1910) | 0.96 in (1906) |
| August 26 | 97.0°F (2010) | 35.1°F (1892) | 0.55 in (1892) |
| August 27 | 95.0°F (2011) | 39.0°F (1911) | 0.51 in (1928) |
| August 28 | 97.0°F (2012) | 35.1°F (1918) | 0.23 in (2024) |
| August 29 | 96.1°F (1929) | 35.1°F (1892) | 0.25 in (1932) |
| August 30 | 97.0°F (1929) | 35.1°F (1924) | 0.61 in (1926) |
| August 31 | 102.0°F (1955) | 34.0°F (1930) | 0.69 in (1906) |