September weather in Dillon, MT
The average temperature in Dillon in September is 55.1°F (39.3°F–70.8°F). Average precipitation: 0.89 inches.
September is a fall month in Dillon, and is warmer than the annual average of 42.8°F. Daily temperatures swing about 31.5°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
70.8°F
Avg Low
39.3°F
Precipitation
0.89 in
Daylight
12h 18m
September records in Dillon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (1945) | 30.0°F (2006) | 0.81 in (1973) |
| September 2 | 93.0°F (1950) | 27.0°F (1974) | 0.67 in (1915) |
| September 3 | 93.0°F (1950) | 28.9°F (1956) | 2.40 in (1901) |
| September 4 | 93.9°F (1998) | 28.0°F (1965) | 0.88 in (2023) |
| September 5 | 93.9°F (2020) | 26.1°F (1956) | 0.98 in (1925) |
| September 6 | 90.0°F (2022) | 28.0°F (1948) | 0.84 in (2001) |
| September 7 | 91.0°F (1955) | 26.1°F (1929) | 0.99 in (1925) |
| September 8 | 90.0°F (2021) | 24.1°F (1976) | 0.67 in (1995) |
| September 9 | 91.0°F (2021) | 21.0°F (2002) | 0.98 in (1921) |
| September 10 | 89.1°F (1968) | 28.0°F (1964) | 0.50 in (1930) |
| September 11 | 90.0°F (1953) | 25.0°F (1989) | 1.31 in (1909) |
| September 12 | 91.0°F (1900) | 21.0°F (1989) | 1.50 in (2024) |
| September 13 | 91.0°F (1948) | 25.0°F (1974) | 0.93 in (1982) |
| September 14 | 86.0°F (1946) | 24.1°F (1947) | 1.01 in (1982) |
| September 15 | 88.0°F (1979) | 24.1°F (1970) | 1.44 in (2017) |
| September 16 | 87.1°F (1979) | 25.0°F (1965) | 1.01 in (2015) |
| September 17 | 87.1°F (1981) | 15.1°F (1965) | 1.00 in (1947) |
| September 18 | 90.0°F (1981) | 15.1°F (1965) | 1.30 in (1976) |
| September 19 | 90.0°F (1956) | 19.0°F (1965) | 0.53 in (1931) |
| September 20 | 84.9°F (1938) | 12.0°F (1983) | 1.29 in (1968) |
| September 21 | 86.0°F (1939) | -36.0°F (1936) | 0.80 in (2022) |
| September 22 | 87.1°F (1992) | 23.0°F (1941) | 0.43 in (2017) |
| September 23 | 89.1°F (1987) | 21.0°F (1996) | 0.87 in (1941) |
| September 24 | 86.0°F (1952) | 9.0°F (1926) | 1.03 in (1916) |
| September 25 | 88.0°F (1952) | 17.1°F (1926) | 0.91 in (1981) |
| September 26 | 86.0°F (1952) | 14.0°F (1972) | 0.44 in (1947) |
| September 27 | 84.9°F (1963) | 18.0°F (1951) | 0.60 in (1982) |
| September 28 | 84.9°F (1967) | 17.1°F (1945) | 1.79 in (1940) |
| September 29 | 91.9°F (1991) | 12.9°F (1985) | 1.27 in (1931) |
| September 30 | 87.1°F (1992) | 18.0°F (1985) | 1.30 in (2009) |