September weather in Fairfield, ID
The average temperature in Fairfield in September is 56.7°F (39.5°F–73.8°F). Average precipitation: 0.70 inches.
September is a fall month in Fairfield, and is warmer than the annual average of 42.1°F. Daily temperatures swing about 34.3°F between overnight low and afternoon high. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
73.8°F
Avg Low
39.5°F
Precipitation
0.70 in
Daylight
12h 17m
September records in Fairfield
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (1950) | 28.0°F (2008) | 0.66 in (2000) |
| September 2 | 96.1°F (1950) | 24.1°F (1989) | 1.05 in (2000) |
| September 3 | 96.1°F (1950) | 21.0°F (1989) | 0.03 in (1960) |
| September 4 | 93.0°F (1950) | 23.0°F (1989) | 0.25 in (2013) |
| September 5 | 95.0°F (1955) | 21.0°F (1989) | 1.05 in (1978) |
| September 6 | 93.9°F (1955) | 23.0°F (1989) | 0.53 in (1978) |
| September 7 | 91.0°F (1979) | 21.9°F (1976) | 0.44 in (1965) |
| September 8 | 89.1°F (1988) | 23.0°F (1989) | 0.64 in (2019) |
| September 9 | 89.1°F (1988) | 21.0°F (1989) | 1.30 in (1961) |
| September 10 | 89.1°F (1953) | 19.0°F (1983) | 0.58 in (1980) |
| September 11 | 90.0°F (1963) | 21.0°F (1989) | 0.70 in (1976) |
| September 12 | 91.9°F (1953) | 23.0°F (1989) | 0.15 in (1976) |
| September 13 | 89.1°F (1953) | 21.9°F (1989) | 0.49 in (1982) |
| September 14 | 89.1°F (1953) | 17.1°F (1970) | 1.08 in (1959) |
| September 15 | 91.0°F (2000) | 21.9°F (1970) | 0.42 in (1959) |
| September 16 | 90.0°F (1981) | 19.9°F (1985) | 0.65 in (1965) |
| September 17 | 90.0°F (1981) | 15.1°F (1965) | 0.38 in (1985) |
| September 18 | 90.0°F (1981) | 15.1°F (1965) | 0.34 in (1959) |
| September 19 | 89.1°F (1981) | 15.1°F (1965) | 0.54 in (1959) |
| September 20 | 88.0°F (1984) | 15.1°F (1983) | 0.56 in (1969) |
| September 21 | 86.0°F (1966) | 14.0°F (1983) | 0.32 in (2016) |
| September 22 | 91.0°F (1987) | 19.9°F (1993) | 0.14 in (2016) |
| September 23 | 90.0°F (1966) | 19.9°F (1985) | 0.26 in (2016) |
| September 24 | 90.0°F (1987) | 18.0°F (1972) | 0.10 in (1973) |
| September 25 | 90.0°F (1987) | 12.0°F (1970) | 0.23 in (2013) |
| September 26 | 87.1°F (1963) | 19.9°F (1985) | 0.66 in (1959) |
| September 27 | 89.1°F (1963) | 19.0°F (1971) | 0.45 in (1986) |
| September 28 | 89.1°F (2024) | 18.0°F (1999) | 0.38 in (1949) |
| September 29 | 86.0°F (1963) | 18.0°F (2019) | 0.80 in (2014) |
| September 30 | 88.0°F (1992) | 10.9°F (1985) | 0.80 in (2014) |