September weather in Bozeman, MT
The average temperature in Bozeman in September is 56.9°F (42.4°F–71.4°F). Average precipitation: 1.44 inches. Average snowfall is 0.4 inches.
September is a fall month in Bozeman, and is warmer than the annual average of 44.1°F. Daily temperatures swing about 29°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
71.4°F
Avg Low
42.4°F
Precipitation
1.44 in
Snow
0.4 in
September records in Bozeman
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (2024) | 28.0°F (1930) | 0.95 in (1961) |
| September 2 | 95.0°F (1947) | 33.1°F (1961) | 1.38 in (1944) |
| September 3 | 99.0°F (2022) | 30.9°F (1956) | 0.78 in (1909) |
| September 4 | 98.1°F (2022) | 28.9°F (1929) | 1.01 in (2023) |
| September 5 | 93.0°F (1967) | 32.0°F (1912) | 0.75 in (1924) |
| September 6 | 91.9°F (2020) | 30.0°F (1898) | 0.68 in (1949) |
| September 7 | 90.0°F (2022) | 24.1°F (1929) | 1.28 in (1941) |
| September 8 | 93.0°F (1979) | 27.0°F (1962) | 1.27 in (1970) |
| September 9 | 91.0°F (1979) | 28.0°F (1962) | 1.22 in (1950) |
| September 10 | 88.0°F (1982) | 26.1°F (1896) | 1.69 in (1947) |
| September 11 | 89.1°F (1919) | 26.1°F (1989) | 0.89 in (1978) |
| September 12 | 90.0°F (1947) | 25.0°F (2014) | 1.57 in (1978) |
| September 13 | 88.0°F (1948) | 26.1°F (1970) | 0.80 in (1895) |
| September 14 | 88.0°F (1946) | 24.1°F (1970) | 1.38 in (1917) |
| September 15 | 91.9°F (2000) | 27.0°F (1936) | 1.09 in (1933) |
| September 16 | 88.0°F (1998) | 24.1°F (1965) | 0.83 in (1902) |
| September 17 | 89.1°F (2009) | 19.0°F (1965) | 0.91 in (1947) |
| September 18 | 87.1°F (1981) | 16.0°F (1965) | 1.48 in (2024) |
| September 19 | 88.0°F (1898) | 23.0°F (1965) | 0.55 in (2017) |
| September 20 | 84.9°F (1956) | 16.0°F (1983) | 0.91 in (1914) |
| September 21 | 86.0°F (1967) | 24.1°F (1895) | 1.53 in (1984) |
| September 22 | 84.9°F (1967) | 23.0°F (1961) | 0.78 in (1945) |
| September 23 | 86.0°F (1966) | 19.9°F (1913) | 0.63 in (1912) |
| September 24 | 89.1°F (2014) | 12.0°F (1926) | 0.83 in (1917) |
| September 25 | 91.0°F (2014) | 17.1°F (1926) | 0.91 in (1902) |
| September 26 | 89.1°F (2001) | 19.9°F (1900) | 0.64 in (1908) |
| September 27 | 87.1°F (1897) | 19.0°F (1900) | 1.12 in (1982) |
| September 28 | 84.0°F (1892) | 21.0°F (1985) | 0.61 in (1968) |
| September 29 | 88.0°F (2024) | 16.0°F (1985) | 1.33 in (1905) |
| September 30 | 86.0°F (1897) | 21.0°F (1985) | 1.03 in (1926) |