August weather in Lewistown, MT
The average temperature in Lewistown in August is 65.4°F (49.6°F–81.1°F). Average precipitation: 1.69 inches.
August is a summer month in Lewistown, and is warmer than the annual average of 43.1°F. Daily temperatures swing about 31.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 14h 2m. For travel, August is a comfortable month to visit.
Avg High
81.1°F
Avg Low
49.6°F
Precipitation
1.69 in
Daylight
14h 2m
August records in Lewistown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 97.0°F (2022) | 37.0°F (2002) | 0.96 in (1998) |
| August 2 | 96.1°F (1966) | 36.0°F (1937) | 2.35 in (1985) |
| August 3 | 99.0°F (1961) | 33.1°F (1896) | 1.10 in (1960) |
| August 4 | 98.1°F (1961) | 37.9°F (1937) | 0.75 in (1954) |
| August 5 | 102.9°F (1961) | 35.1°F (1935) | 0.55 in (1954) |
| August 6 | 102.0°F (1983) | 37.0°F (1924) | 0.89 in (1960) |
| August 7 | 97.0°F (2001) | 37.9°F (1896) | 2.50 in (1900) |
| August 8 | 96.1°F (1991) | 33.1°F (1896) | 2.99 in (2002) |
| August 9 | 100.0°F (1940) | 30.9°F (1902) | 0.62 in (1939) |
| August 10 | 100.0°F (2003) | 33.1°F (1902) | 1.20 in (1907) |
| August 11 | 100.9°F (2018) | 30.9°F (1896) | 1.57 in (1909) |
| August 12 | 100.9°F (1940) | 30.9°F (1916) | 1.25 in (1950) |
| August 13 | 97.0°F (1973) | 36.0°F (1912) | 0.58 in (1944) |
| August 14 | 100.9°F (1929) | 36.0°F (1995) | 0.78 in (1968) |
| August 15 | 99.0°F (1990) | 33.1°F (1943) | 1.02 in (1968) |
| August 16 | 98.1°F (1973) | 32.0°F (1905) | 0.46 in (1911) |
| August 17 | 98.1°F (1906) | 30.9°F (1910) | 0.88 in (1990) |
| August 18 | 97.0°F (1964) | 33.1°F (1902) | 0.90 in (2016) |
| August 19 | 97.0°F (2008) | 30.9°F (1907) | 1.47 in (1964) |
| August 20 | 97.0°F (1931) | 32.0°F (1916) | 2.67 in (1964) |
| August 21 | 97.0°F (1969) | 28.9°F (1904) | 1.80 in (1918) |
| August 22 | 98.1°F (1976) | 34.0°F (1928) | 1.66 in (1992) |
| August 23 | 100.9°F (1969) | 33.1°F (1992) | 3.34 in (2014) |
| August 24 | 100.9°F (1969) | 30.9°F (1934) | 1.38 in (1989) |
| August 25 | 99.0°F (2008) | 27.0°F (1910) | 1.16 in (1979) |
| August 26 | 99.0°F (1926) | 30.0°F (1896) | 0.70 in (1941) |
| August 27 | 97.0°F (1971) | 30.0°F (1900) | 0.80 in (1907) |
| August 28 | 100.0°F (1924) | 33.1°F (1918) | 0.94 in (1993) |
| August 29 | 93.9°F (2005) | 32.0°F (1902) | 0.69 in (2010) |
| August 30 | 96.1°F (1929) | 30.0°F (1912) | 1.11 in (1956) |
| August 31 | 99.0°F (2016) | 34.0°F (1930) | 0.72 in (1973) |