September weather in Cottonwood, ID
The average temperature in Cottonwood in September is 60.4°F (48.7°F–72.2°F). Average precipitation: 1.06 inches.
September is a fall month in Cottonwood, and is warmer than the annual average of 47.6°F. Daily temperatures swing about 23.5°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
72.2°F
Avg Low
48.7°F
Precipitation
1.06 in
Snow
0.1 in
September records in Cottonwood
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2025) | 36.0°F (1999) | 0.38 in (1978) |
| September 2 | 96.1°F (2025) | 37.9°F (2000) | 0.37 in (1985) |
| September 3 | 96.1°F (2017) | 37.9°F (2000) | 0.79 in (1997) |
| September 4 | 93.9°F (1988) | 39.0°F (2015) | 0.85 in (2023) |
| September 5 | 90.0°F (1988) | 39.9°F (1992) | 0.62 in (2013) |
| September 6 | 91.9°F (2017) | 33.1°F (1984) | 0.52 in (1985) |
| September 7 | 89.1°F (2024) | 35.1°F (1992) | 0.42 in (1978) |
| September 8 | 89.1°F (1981) | 35.1°F (2020) | 0.63 in (2003) |
| September 9 | 87.1°F (1981) | 37.0°F (2001) | 2.00 in (1998) |
| September 10 | 86.0°F (1990) | 35.1°F (1978) | 0.44 in (1982) |
| September 11 | 89.1°F (1990) | 34.0°F (2014) | 0.63 in (2024) |
| September 12 | 89.1°F (2015) | 36.0°F (1985) | 0.97 in (2025) |
| September 13 | 84.9°F (2002) | 35.1°F (1993) | 0.71 in (1980) |
| September 14 | 90.0°F (2000) | 35.1°F (1982) | 0.40 in (2025) |
| September 15 | 87.1°F (1979) | 33.1°F (1982) | 0.51 in (1985) |
| September 16 | 90.0°F (1981) | 34.0°F (2006) | 0.28 in (2006) |
| September 17 | 93.0°F (1981) | 35.1°F (1978) | 0.51 in (1985) |
| September 18 | 91.9°F (1981) | 33.1°F (1978) | 0.44 in (2004) |
| September 19 | 84.0°F (1981) | 32.0°F (1983) | 0.62 in (2006) |
| September 20 | 84.0°F (1979) | 27.0°F (1983) | 0.57 in (2017) |
| September 21 | 82.9°F (1999) | 33.1°F (1988) | 0.80 in (2023) |
| September 22 | 86.0°F (1992) | 30.9°F (2000) | 0.45 in (2022) |
| September 23 | 88.0°F (2001) | 25.0°F (2000) | 0.54 in (1984) |
| September 24 | 90.0°F (2001) | 32.0°F (1984) | 1.27 in (1992) |
| September 25 | 84.9°F (2024) | 32.0°F (1984) | 0.57 in (2013) |
| September 26 | 84.0°F (2022) | 27.0°F (1981) | 0.43 in (1982) |
| September 27 | 87.1°F (2022) | 32.0°F (1999) | 0.64 in (1988) |
| September 28 | 84.9°F (2016) | 27.0°F (1985) | 0.48 in (2021) |
| September 29 | 82.9°F (1992) | 28.0°F (1985) | 0.64 in (1977) |
| September 30 | 86.0°F (1992) | 30.0°F (2019) | 0.65 in (2000) |