September weather in Troy, MT
The average temperature in Troy in September is 58.3°F (41.7°F–74.9°F). Average precipitation: 1.21 inches.
September is a fall month in Troy, and is warmer than the annual average of 46.8°F. Daily temperatures swing about 33.2°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
74.9°F
Avg Low
41.7°F
Precipitation
1.21 in
Daylight
12h 20m
September records in Troy
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1967) | 30.9°F (1999) | 0.52 in (1961) |
| September 2 | 97.0°F (1998) | 32.0°F (1974) | 0.89 in (1980) |
| September 3 | 100.0°F (2003) | 27.0°F (1962) | 0.41 in (1965) |
| September 4 | 100.0°F (2003) | 28.0°F (1962) | 0.69 in (1970) |
| September 5 | 100.9°F (1998) | 30.9°F (1960) | 0.34 in (2013) |
| September 6 | 102.0°F (1998) | 30.0°F (1969) | 0.78 in (1985) |
| September 7 | 102.0°F (1998) | 28.0°F (2020) | 0.30 in (1995) |
| September 8 | 95.0°F (2024) | 30.0°F (1960) | 0.30 in (1992) |
| September 9 | 91.9°F (1969) | 28.9°F (1976) | 0.27 in (1974) |
| September 10 | 93.0°F (1969) | 30.0°F (2014) | 0.42 in (2005) |
| September 11 | 93.9°F (1990) | 27.0°F (1964) | 0.73 in (1962) |
| September 12 | 98.1°F (1987) | 23.0°F (1970) | 0.81 in (1985) |
| September 13 | 93.0°F (1987) | 25.0°F (1970) | 0.54 in (2021) |
| September 14 | 91.9°F (2001) | 21.9°F (1970) | 0.52 in (1980) |
| September 15 | 91.9°F (2001) | 24.1°F (1970) | 0.71 in (1993) |
| September 16 | 93.0°F (2001) | 25.0°F (1965) | 1.21 in (2004) |
| September 17 | 90.0°F (2009) | 25.0°F (1971) | 0.61 in (1977) |
| September 18 | 91.9°F (1981) | 24.1°F (1971) | 0.95 in (1968) |
| September 19 | 88.0°F (1984) | 25.0°F (1987) | 0.70 in (2021) |
| September 20 | 88.0°F (1967) | 23.0°F (1983) | 0.62 in (1973) |
| September 21 | 95.0°F (1967) | 26.1°F (1971) | 0.72 in (1968) |
| September 22 | 93.0°F (1967) | 25.0°F (1960) | 0.37 in (1972) |
| September 23 | 89.1°F (2003) | 19.9°F (2000) | 0.62 in (1972) |
| September 24 | 91.9°F (2009) | 21.9°F (1984) | 0.42 in (1992) |
| September 25 | 91.0°F (2009) | 21.0°F (2000) | 0.50 in (2013) |
| September 26 | 93.9°F (2001) | 27.0°F (1970) | 0.93 in (1982) |
| September 27 | 89.1°F (1994) | 21.9°F (1961) | 0.20 in (1972) |
| September 28 | 91.0°F (1967) | 19.9°F (1985) | 0.36 in (1995) |
| September 29 | 90.0°F (1967) | 17.1°F (1985) | 0.35 in (1977) |
| September 30 | 84.9°F (1967) | 19.0°F (1985) | 0.95 in (1964) |