September weather in Three Forks, MT
The average temperature in Three Forks in September is 58.3°F (43.3°F–73.3°F). Average precipitation: 1.10 inches.
September is a fall month in Three Forks, and is warmer than the annual average of 45.4°F. Daily temperatures swing about 30°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.3°F
Avg Low
43.3°F
Precipitation
1.10 in
Daylight
12h 18m
September records in Three Forks
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1929) | 30.0°F (1930) | 0.72 in (1963) |
| September 2 | 97.0°F (2007) | 32.0°F (1974) | 1.38 in (1958) |
| September 3 | 100.0°F (2022) | 34.0°F (1974) | 0.30 in (1947) |
| September 4 | 97.0°F (1924) | 30.9°F (1929) | 0.15 in (1992) |
| September 5 | 100.0°F (2020) | 33.1°F (1994) | 0.65 in (1937) |
| September 6 | 96.1°F (1931) | 32.0°F (1996) | 1.15 in (2001) |
| September 7 | 98.1°F (2022) | 26.1°F (1929) | 0.75 in (1946) |
| September 8 | 95.0°F (1979) | 28.0°F (1929) | 1.45 in (1970) |
| September 9 | 93.0°F (1981) | 26.1°F (1962) | 0.91 in (2019) |
| September 10 | 93.9°F (1966) | 32.0°F (1924) | 0.70 in (2000) |
| September 11 | 93.0°F (1981) | 23.0°F (1989) | 1.50 in (1976) |
| September 12 | 91.9°F (1953) | 26.1°F (1989) | 1.14 in (1978) |
| September 13 | 91.0°F (1948) | 26.1°F (1974) | 0.41 in (1982) |
| September 14 | 93.0°F (1948) | 24.1°F (1970) | 0.55 in (1973) |
| September 15 | 97.0°F (2000) | 26.1°F (1970) | 1.27 in (2017) |
| September 16 | 91.9°F (1979) | 28.0°F (1936) | 0.58 in (1947) |
| September 17 | 91.9°F (1981) | 23.0°F (1965) | 0.83 in (1942) |
| September 18 | 95.0°F (1981) | 21.0°F (1965) | 0.73 in (1976) |
| September 19 | 93.0°F (1938) | 23.0°F (1943) | 0.64 in (1983) |
| September 20 | 90.0°F (1938) | 19.0°F (1983) | 0.83 in (1941) |
| September 21 | 91.0°F (1938) | 21.9°F (1995) | 0.93 in (1984) |
| September 22 | 93.0°F (1930) | 27.0°F (1960) | 0.89 in (2016) |
| September 23 | 91.9°F (1966) | 21.9°F (1926) | 1.36 in (1941) |
| September 24 | 91.0°F (1938) | 14.0°F (1926) | 0.73 in (2005) |
| September 25 | 91.0°F (2001) | 12.9°F (1926) | 0.58 in (1981) |
| September 26 | 89.1°F (1952) | 18.0°F (1926) | 0.82 in (2013) |
| September 27 | 88.0°F (1963) | 21.9°F (1926) | 1.20 in (1982) |
| September 28 | 89.1°F (1967) | 19.9°F (1945) | 0.87 in (1940) |
| September 29 | 90.0°F (1938) | 16.0°F (1985) | 0.49 in (2007) |
| September 30 | 89.1°F (1963) | 18.0°F (1985) | 1.70 in (1977) |