September weather in Fairfield, MT
The average temperature in Fairfield in September is 56.3°F (44.0°F–68.5°F). Average precipitation: 1.23 inches.
September is a fall month in Fairfield, and is warmer than the annual average of 44.4°F. Daily temperatures swing about 24.5°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
68.5°F
Avg Low
44.0°F
Precipitation
1.23 in
Daylight
12h 19m
September records in Fairfield
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (1967) | 35.1°F (1930) | 0.98 in (2008) |
| September 2 | 93.9°F (1967) | 30.9°F (1974) | 1.00 in (1999) |
| September 3 | 97.0°F (2022) | 30.0°F (1962) | 0.82 in (1941) |
| September 4 | 90.0°F (1950) | 30.0°F (1929) | 1.10 in (1995) |
| September 5 | 91.9°F (1967) | 30.0°F (1956) | 0.90 in (2015) |
| September 6 | 91.9°F (1958) | 26.1°F (1929) | 0.93 in (2015) |
| September 7 | 93.9°F (2022) | 26.1°F (1929) | 0.71 in (1946) |
| September 8 | 93.0°F (1981) | 32.0°F (1928) | 0.60 in (1986) |
| September 9 | 91.9°F (1981) | 30.9°F (1962) | 0.65 in (1965) |
| September 10 | 90.0°F (1958) | 28.9°F (1989) | 0.66 in (2010) |
| September 11 | 90.0°F (1981) | 27.0°F (1970) | 0.95 in (1978) |
| September 12 | 89.1°F (1981) | 25.0°F (1970) | 0.67 in (1978) |
| September 13 | 88.0°F (1953) | 25.0°F (1970) | 0.44 in (2017) |
| September 14 | 91.9°F (2000) | 23.0°F (1970) | 0.84 in (2017) |
| September 15 | 91.9°F (1979) | 25.0°F (1965) | 0.74 in (2017) |
| September 16 | 88.0°F (1979) | 24.1°F (1965) | 0.91 in (1959) |
| September 17 | 89.1°F (1981) | 19.9°F (1965) | 0.64 in (1947) |
| September 18 | 91.9°F (1981) | 24.1°F (1957) | 1.38 in (1976) |
| September 19 | 90.0°F (1981) | 19.9°F (1957) | 0.65 in (2004) |
| September 20 | 87.1°F (2009) | 23.0°F (1934) | 1.55 in (1968) |
| September 21 | 88.0°F (1966) | 21.9°F (2000) | 1.08 in (1940) |
| September 22 | 87.1°F (1987) | 18.0°F (2000) | 1.18 in (1945) |
| September 23 | 90.0°F (1966) | 15.1°F (1934) | 1.36 in (1930) |
| September 24 | 89.1°F (2001) | 16.0°F (1934) | 0.57 in (1941) |
| September 25 | 91.0°F (2009) | 24.1°F (1972) | 0.50 in (1936) |
| September 26 | 88.0°F (1943) | 21.0°F (1934) | 0.93 in (1929) |
| September 27 | 88.0°F (1963) | 21.0°F (1941) | 1.18 in (1982) |
| September 28 | 87.1°F (2022) | 21.0°F (1984) | 0.37 in (1939) |
| September 29 | 89.1°F (1963) | 19.0°F (1985) | 0.42 in (1937) |
| September 30 | 87.1°F (1992) | 12.9°F (2019) | 0.62 in (1977) |