August weather in Boulder, MT
The average temperature in Boulder in August is 64.1°F (46.2°F–82.0°F). Average precipitation: 1.12 inches.
August is a summer month in Boulder, and is warmer than the annual average of 42.6°F. Daily temperatures swing about 35.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 13h 59m. For travel, August is a comfortable month to visit.
Avg High
82.0°F
Avg Low
46.2°F
Precipitation
1.12 in
Daylight
13h 59m
August records in Boulder
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 96.1°F (2000) | 39.0°F (1950) | 0.22 in (1976) |
| August 2 | 97.0°F (1952) | 39.0°F (1963) | 1.15 in (2021) |
| August 3 | 97.0°F (1961) | 39.9°F (1978) | 0.76 in (2014) |
| August 4 | 99.0°F (1961) | 36.0°F (1996) | 1.40 in (1976) |
| August 5 | 100.0°F (1961) | 36.0°F (1996) | 0.64 in (1950) |
| August 6 | 97.0°F (1983) | 36.0°F (1962) | 0.52 in (2010) |
| August 7 | 97.0°F (1983) | 37.9°F (2025) | 1.55 in (2023) |
| August 8 | 95.0°F (1990) | 36.0°F (1988) | 1.07 in (2002) |
| August 9 | 93.9°F (2000) | 32.0°F (1995) | 0.31 in (2006) |
| August 10 | 97.0°F (1991) | 36.0°F (1970) | 0.35 in (1961) |
| August 11 | 99.0°F (1971) | 35.1°F (1953) | 1.10 in (1990) |
| August 12 | 93.0°F (1981) | 30.0°F (1987) | 0.68 in (1963) |
| August 13 | 93.9°F (1970) | 37.0°F (1987) | 0.42 in (1965) |
| August 14 | 93.9°F (2003) | 33.1°F (2005) | 0.78 in (1972) |
| August 15 | 95.0°F (2003) | 33.1°F (2005) | 0.60 in (1960) |
| August 16 | 95.0°F (2003) | 35.1°F (2020) | 0.36 in (1960) |
| August 17 | 93.9°F (1951) | 28.9°F (2002) | 0.40 in (1954) |
| August 18 | 95.0°F (2023) | 30.9°F (1995) | 0.49 in (1996) |
| August 19 | 93.9°F (2013) | 30.0°F (1995) | 0.58 in (1964) |
| August 20 | 93.0°F (1953) | 35.1°F (1956) | 1.46 in (1990) |
| August 21 | 91.9°F (1969) | 35.1°F (1966) | 0.94 in (1993) |
| August 22 | 93.9°F (1969) | 30.0°F (1992) | 0.72 in (2014) |
| August 23 | 93.9°F (1969) | 28.0°F (1992) | 1.30 in (2004) |
| August 24 | 96.1°F (1969) | 25.0°F (1992) | 0.38 in (1989) |
| August 25 | 97.0°F (1969) | 19.0°F (1992) | 0.32 in (1979) |
| August 26 | 93.0°F (2010) | 27.0°F (1992) | 0.57 in (2022) |
| August 27 | 93.0°F (1971) | 30.0°F (1960) | 0.40 in (1978) |
| August 28 | 91.9°F (1971) | 24.1°F (1960) | 0.56 in (1991) |
| August 29 | 91.9°F (2012) | 27.0°F (1992) | 0.29 in (1993) |
| August 30 | 91.9°F (1954) | 26.1°F (1965) | 1.04 in (1971) |
| August 31 | 93.9°F (1955) | 28.9°F (2005) | 0.59 in (1984) |