September weather in Fort Benton, MT
The average temperature in Fort Benton in September is 58.3°F (42.3°F–74.2°F). Average precipitation: 1.20 inches. Average snowfall is 0.3 inches.
September is a fall month in Fort Benton, and is warmer than the annual average of 45.4°F. Daily temperatures swing about 31.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
74.2°F
Avg Low
42.3°F
Precipitation
1.20 in
Snow
0.3 in
September records in Fort Benton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1983) | 34.0°F (1910) | 0.70 in (2008) |
| September 2 | 100.0°F (1998) | 28.0°F (1974) | 0.87 in (1953) |
| September 3 | 99.0°F (2013) | 30.0°F (1962) | 0.85 in (1911) |
| September 4 | 104.0°F (2022) | 28.0°F (1962) | 1.10 in (1911) |
| September 5 | 99.0°F (1967) | 32.0°F (1956) | 1.00 in (1911) |
| September 6 | 98.1°F (1980) | 28.0°F (1992) | 0.68 in (1978) |
| September 7 | 100.0°F (1998) | 27.0°F (1895) | 1.43 in (1941) |
| September 8 | 102.9°F (2022) | 25.0°F (1943) | 0.47 in (2007) |
| September 9 | 95.0°F (2017) | 23.0°F (1962) | 0.65 in (1965) |
| September 10 | 95.0°F (2017) | 28.0°F (1945) | 0.45 in (1895) |
| September 11 | 93.0°F (1981) | 24.1°F (1989) | 0.81 in (1988) |
| September 12 | 95.0°F (2017) | 25.0°F (1964) | 1.65 in (1978) |
| September 13 | 95.0°F (1959) | 25.0°F (1949) | 0.54 in (1967) |
| September 14 | 98.1°F (1948) | 21.9°F (1970) | 0.48 in (1991) |
| September 15 | 96.1°F (2000) | 26.1°F (1970) | 0.80 in (1906) |
| September 16 | 91.9°F (1979) | 26.1°F (1897) | 0.86 in (2018) |
| September 17 | 93.9°F (2009) | 26.1°F (1982) | 0.76 in (1947) |
| September 18 | 96.1°F (2009) | 19.9°F (1971) | 1.45 in (1988) |
| September 19 | 97.0°F (1938) | 25.0°F (1943) | 1.57 in (2024) |
| September 20 | 95.0°F (2009) | 19.9°F (1995) | 0.65 in (2004) |
| September 21 | 93.0°F (1938) | 21.0°F (1995) | 0.88 in (1984) |
| September 22 | 93.0°F (1938) | 19.0°F (1895) | 1.20 in (1945) |
| September 23 | 91.9°F (1990) | 26.1°F (1946) | 0.70 in (2023) |
| September 24 | 96.1°F (2001) | 23.0°F (1984) | 0.39 in (1941) |
| September 25 | 100.0°F (2001) | 21.0°F (1984) | 0.47 in (2013) |
| September 26 | 96.1°F (2011) | 24.1°F (1972) | 0.62 in (1961) |
| September 27 | 93.0°F (1957) | 24.1°F (1961) | 1.60 in (1982) |
| September 28 | 89.1°F (1967) | 19.0°F (1972) | 0.68 in (2014) |
| September 29 | 95.0°F (2022) | 17.1°F (1985) | 0.89 in (2019) |
| September 30 | 93.9°F (1992) | 17.1°F (1985) | 0.47 in (1977) |