September weather in Missoula, MT
The average temperature in Missoula in September is 58.3°F (43.6°F–73.1°F). Average precipitation: 1.14 inches.
September is a fall month in Missoula, and is warmer than the annual average of 46.2°F. Daily temperatures swing about 29.5°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
73.1°F
Avg Low
43.6°F
Precipitation
1.14 in
Daylight
12h 19m
September records in Missoula
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1967) | 35.1°F (1973) | 0.68 in (2008) |
| September 2 | 96.1°F (1988) | 34.0°F (2012) | 0.45 in (1989) |
| September 3 | 97.0°F (1988) | 34.0°F (1975) | 0.46 in (1997) |
| September 4 | 96.1°F (1998) | 35.1°F (1969) | 0.36 in (1994) |
| September 5 | 96.1°F (1967) | 37.9°F (1969) | 0.25 in (1996) |
| September 6 | 93.0°F (1998) | 34.0°F (1969) | 0.72 in (1985) |
| September 7 | 93.0°F (1998) | 28.0°F (1992) | 0.89 in (1995) |
| September 8 | 91.0°F (1967) | 30.0°F (1976) | 0.57 in (1985) |
| September 9 | 91.0°F (1969) | 34.0°F (1970) | 0.57 in (2010) |
| September 10 | 90.0°F (2011) | 30.9°F (1972) | 0.63 in (2005) |
| September 11 | 91.9°F (1990) | 33.1°F (1982) | 0.48 in (1983) |
| September 12 | 89.1°F (2011) | 32.0°F (2012) | 1.12 in (1972) |
| September 13 | 86.0°F (1987) | 28.0°F (1974) | 0.25 in (1991) |
| September 14 | 88.0°F (2002) | 21.0°F (1970) | 0.28 in (1985) |
| September 15 | 91.9°F (2002) | 25.0°F (1970) | 0.41 in (2006) |
| September 16 | 91.9°F (2009) | 28.0°F (1970) | 0.61 in (2006) |
| September 17 | 89.1°F (1981) | 28.0°F (1978) | 0.65 in (2005) |
| September 18 | 93.0°F (1981) | 28.0°F (1971) | 0.75 in (2004) |
| September 19 | 84.9°F (2009) | 28.9°F (1971) | 0.45 in (2006) |
| September 20 | 84.0°F (1967) | 23.0°F (1983) | 0.72 in (1984) |
| September 21 | 91.0°F (1967) | 26.1°F (1971) | 0.34 in (2006) |
| September 22 | 86.0°F (2011) | 25.0°F (1993) | 0.26 in (1968) |
| September 23 | 89.1°F (2011) | 23.0°F (2000) | 1.34 in (2007) |
| September 24 | 91.0°F (2001) | 27.0°F (1970) | 0.35 in (1992) |
| September 25 | 91.0°F (2001) | 25.0°F (1970) | 0.48 in (1973) |
| September 26 | 82.9°F (1978) | 28.9°F (1970) | 0.38 in (1989) |
| September 27 | 84.0°F (1991) | 28.0°F (1972) | 0.90 in (1982) |
| September 28 | 87.1°F (1967) | 25.0°F (1985) | 0.43 in (1982) |
| September 29 | 82.0°F (1967) | 23.0°F (1985) | 0.48 in (1977) |
| September 30 | 84.0°F (1992) | 26.1°F (1972) | 0.34 in (1967) |