August weather in Helena, MT
The average temperature in Helena in August is 68.8°F (52.9°F–84.6°F). Average precipitation: 1.04 inches. Average snowfall is 0.3 inches.
August is a summer month in Helena, and is warmer than the annual average of 45.5°F. Daily temperatures swing about 31.7°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 14h 0m. For travel, August is a comfortable month to visit.
Avg High
84.6°F
Avg Low
52.9°F
Precipitation
1.04 in
Snow
0.3 in
August records in Helena
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 102.0°F (2022) | 42.1°F (1995) | 0.88 in (2013) |
| August 2 | 100.9°F (2024) | 46.0°F (1963) | 1.06 in (2004) |
| August 3 | 102.9°F (2024) | 43.0°F (1972) | 0.28 in (2003) |
| August 4 | 102.0°F (1961) | 41.0°F (1938) | 0.79 in (1968) |
| August 5 | 102.9°F (1961) | 42.1°F (1940) | 0.50 in (1950) |
| August 6 | 102.9°F (1990) | 43.0°F (1996) | 0.46 in (1956) |
| August 7 | 100.0°F (1990) | 37.9°F (1939) | 0.67 in (1975) |
| August 8 | 99.0°F (1990) | 36.0°F (1939) | 0.64 in (1974) |
| August 9 | 102.0°F (1940) | 39.0°F (1995) | 0.38 in (1938) |
| August 10 | 102.0°F (2003) | 36.0°F (1939) | 0.88 in (2010) |
| August 11 | 98.1°F (2018) | 39.9°F (1947) | 0.99 in (2019) |
| August 12 | 102.9°F (1940) | 41.0°F (1987) | 0.71 in (1965) |
| August 13 | 98.1°F (2015) | 39.0°F (1942) | 0.49 in (1944) |
| August 14 | 99.0°F (2003) | 36.0°F (1995) | 0.50 in (2009) |
| August 15 | 102.0°F (2023) | 39.9°F (1944) | 0.67 in (1960) |
| August 16 | 99.0°F (2022) | 42.1°F (1954) | 0.85 in (2025) |
| August 17 | 102.0°F (2023) | 37.9°F (1985) | 0.74 in (2021) |
| August 18 | 100.0°F (2001) | 39.0°F (1954) | 0.43 in (2016) |
| August 19 | 98.1°F (2008) | 34.0°F (1995) | 0.87 in (1964) |
| August 20 | 96.1°F (1953) | 37.0°F (1938) | 1.15 in (1974) |
| August 21 | 95.0°F (1991) | 39.0°F (1938) | 1.82 in (1983) |
| August 22 | 97.0°F (2006) | 33.1°F (1992) | 0.76 in (1962) |
| August 23 | 98.1°F (1967) | 33.1°F (1992) | 1.16 in (2014) |
| August 24 | 105.1°F (1969) | 33.1°F (1992) | 0.80 in (1990) |
| August 25 | 97.0°F (1966) | 28.0°F (1992) | 0.40 in (1990) |
| August 26 | 97.0°F (2010) | 35.1°F (1992) | 0.34 in (1954) |
| August 27 | 98.1°F (2001) | 37.0°F (1993) | 0.42 in (1991) |
| August 28 | 97.0°F (2012) | 36.0°F (1977) | 0.64 in (1964) |
| August 29 | 99.0°F (2005) | 37.0°F (1975) | 0.43 in (1951) |
| August 30 | 96.1°F (1999) | 34.0°F (1993) | 0.53 in (1971) |
| August 31 | 97.0°F (2022) | 32.0°F (1956) | 1.06 in (1986) |