September weather in East Helena, MT
The average temperature in East Helena in September is 58.9°F (44.6°F–73.3°F). Average precipitation: 0.96 inches. Average snowfall is 0.2 inches.
September is a fall month in East Helena, and is warmer than the annual average of 45.5°F. Daily temperatures swing about 28.7°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
73.3°F
Avg Low
44.6°F
Precipitation
0.96 in
Snow
0.2 in
September records in East Helena
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (1967) | 35.1°F (1952) | 0.46 in (2008) |
| September 2 | 97.0°F (2007) | 32.0°F (1959) | 0.53 in (1944) |
| September 3 | 99.0°F (2022) | 32.0°F (1958) | 0.27 in (1971) |
| September 4 | 96.1°F (1998) | 30.9°F (1962) | 0.42 in (2023) |
| September 5 | 99.0°F (1967) | 30.0°F (1956) | 0.77 in (2001) |
| September 6 | 93.9°F (2022) | 30.0°F (1956) | 0.59 in (2019) |
| September 7 | 102.0°F (2022) | 28.0°F (1992) | 0.66 in (1995) |
| September 8 | 93.0°F (1994) | 28.9°F (1960) | 1.11 in (2019) |
| September 9 | 93.0°F (1982) | 25.0°F (1959) | 0.59 in (1998) |
| September 10 | 91.0°F (1966) | 32.0°F (1949) | 0.84 in (1988) |
| September 11 | 91.9°F (1958) | 28.0°F (1989) | 1.61 in (1980) |
| September 12 | 91.0°F (1953) | 21.9°F (1949) | 0.52 in (1993) |
| September 13 | 91.9°F (1959) | 27.0°F (1949) | 0.75 in (1982) |
| September 14 | 93.9°F (1948) | 18.0°F (1970) | 0.60 in (2017) |
| September 15 | 93.9°F (2000) | 21.9°F (1970) | 1.02 in (2017) |
| September 16 | 91.9°F (2009) | 27.0°F (1965) | 1.30 in (1947) |
| September 17 | 90.0°F (1998) | 19.9°F (1965) | 0.86 in (1988) |
| September 18 | 91.0°F (1966) | 19.0°F (1965) | 1.08 in (1976) |
| September 19 | 93.9°F (2009) | 25.0°F (1965) | 0.79 in (2004) |
| September 20 | 86.0°F (1938) | 19.9°F (1983) | 1.00 in (1941) |
| September 21 | 90.0°F (1966) | 19.9°F (1995) | 0.68 in (1945) |
| September 22 | 89.1°F (1966) | 25.0°F (1960) | 1.26 in (2023) |
| September 23 | 90.0°F (1966) | 19.0°F (2000) | 0.56 in (2007) |
| September 24 | 91.0°F (2014) | 23.0°F (1961) | 0.63 in (2013) |
| September 25 | 95.0°F (2001) | 23.0°F (1970) | 0.52 in (1981) |
| September 26 | 88.0°F (1952) | 23.0°F (1972) | 0.62 in (1947) |
| September 27 | 88.0°F (1963) | 23.0°F (1961) | 0.85 in (1982) |
| September 28 | 88.0°F (1967) | 19.0°F (1965) | 0.65 in (1940) |
| September 29 | 84.9°F (1938) | 19.0°F (1985) | 0.53 in (2007) |
| September 30 | 89.1°F (1963) | 21.0°F (1950) | 0.80 in (2009) |