September weather in Mullan, ID
The average temperature in Mullan in September is 56.2°F (41.8°F–70.7°F). Average precipitation: 1.57 inches.
September is a fall month in Mullan, and is warmer than the annual average of 45.1°F. Daily temperatures swing about 28.9°F between overnight low and afternoon high. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
70.7°F
Avg Low
41.8°F
Precipitation
1.57 in
Daylight
12h 19m
September records in Mullan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (2025) | 35.1°F (1993) | 0.74 in (1984) |
| September 2 | 96.1°F (2025) | 37.0°F (1991) | 0.94 in (1980) |
| September 3 | 99.0°F (2025) | 34.0°F (2015) | 0.37 in (1994) |
| September 4 | 96.1°F (2025) | 35.1°F (1980) | 0.47 in (1982) |
| September 5 | 93.9°F (1988) | 36.0°F (1980) | 0.49 in (1985) |
| September 6 | 91.0°F (1988) | 32.0°F (1992) | 0.62 in (1984) |
| September 7 | 91.9°F (2017) | 28.9°F (1992) | 0.24 in (2015) |
| September 8 | 90.0°F (1981) | 28.9°F (1976) | 0.39 in (1992) |
| September 9 | 89.1°F (2024) | 30.9°F (1976) | 0.35 in (2016) |
| September 10 | 84.9°F (1987) | 32.0°F (1983) | 0.49 in (1982) |
| September 11 | 88.0°F (1996) | 30.0°F (1989) | 0.53 in (1983) |
| September 12 | 90.0°F (2013) | 28.9°F (2012) | 1.30 in (2024) |
| September 13 | 86.0°F (2013) | 28.9°F (2012) | 0.63 in (1980) |
| September 14 | 86.0°F (2013) | 28.0°F (1992) | 0.40 in (1986) |
| September 15 | 87.1°F (2012) | 30.9°F (1982) | 0.58 in (1992) |
| September 16 | 90.0°F (1981) | 30.0°F (2025) | 0.76 in (1977) |
| September 17 | 91.9°F (1981) | 28.9°F (1978) | 0.84 in (2013) |
| September 18 | 91.9°F (1981) | 30.0°F (1978) | 0.73 in (1989) |
| September 19 | 88.0°F (1981) | 28.9°F (1978) | 0.96 in (2017) |
| September 20 | 84.9°F (2025) | 24.1°F (1983) | 1.03 in (2021) |
| September 21 | 87.1°F (2014) | 27.0°F (1983) | 0.37 in (1984) |
| September 22 | 88.0°F (1987) | 26.1°F (1993) | 0.88 in (2022) |
| September 23 | 91.0°F (1987) | 26.1°F (1985) | 0.63 in (2022) |
| September 24 | 89.1°F (1987) | 27.0°F (1984) | 1.36 in (1992) |
| September 25 | 82.9°F (1994) | 26.1°F (1996) | 0.45 in (2014) |
| September 26 | 87.1°F (1990) | 26.1°F (1996) | 0.81 in (1982) |
| September 27 | 84.0°F (2022) | 30.9°F (1977) | 0.56 in (2019) |
| September 28 | 84.0°F (2022) | 23.0°F (1985) | 0.45 in (1986) |
| September 29 | 82.0°F (1989) | 19.9°F (1985) | 0.77 in (1986) |
| September 30 | 82.9°F (1992) | 25.0°F (1985) | 2.73 in (2013) |