September weather in Pierce, ID
The average temperature in Pierce in September is 54.4°F (36.1°F–72.7°F). Average precipitation: 1.61 inches.
September is a fall month in Pierce, and is warmer than the annual average of 43.6°F. Daily temperatures swing about 36.6°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 19m. For travel, September is cool.
Avg High
72.7°F
Avg Low
36.1°F
Precipitation
1.61 in
Daylight
12h 19m
September records in Pierce
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (2022) | 27.0°F (1973) | 0.84 in (1980) |
| September 2 | 96.1°F (2025) | 27.0°F (1973) | 1.21 in (1964) |
| September 3 | 99.0°F (1988) | 28.9°F (1973) | 0.37 in (1971) |
| September 4 | 99.0°F (1988) | 28.0°F (1969) | 0.52 in (1997) |
| September 5 | 93.0°F (2020) | 30.0°F (1969) | 0.39 in (2000) |
| September 6 | 93.0°F (1973) | 27.0°F (1992) | 1.17 in (2015) |
| September 7 | 91.9°F (2022) | 28.9°F (1969) | 1.15 in (1970) |
| September 8 | 96.1°F (1998) | 23.0°F (1992) | 0.46 in (1978) |
| September 9 | 93.0°F (1981) | 26.1°F (1976) | 0.39 in (1998) |
| September 10 | 88.0°F (1981) | 26.1°F (1976) | 0.91 in (2019) |
| September 11 | 91.0°F (2011) | 28.0°F (1964) | 1.28 in (1985) |
| September 12 | 93.0°F (1996) | 26.1°F (2012) | 1.05 in (1967) |
| September 13 | 91.9°F (2013) | 25.0°F (1970) | 1.11 in (2024) |
| September 14 | 91.9°F (2013) | 18.0°F (1970) | 0.53 in (2004) |
| September 15 | 93.0°F (2000) | 19.9°F (1970) | 0.84 in (1968) |
| September 16 | 91.9°F (1998) | 21.0°F (1970) | 1.58 in (1997) |
| September 17 | 95.0°F (1981) | 19.9°F (1965) | 0.62 in (2004) |
| September 18 | 97.0°F (1981) | 23.0°F (1971) | 0.89 in (2024) |
| September 19 | 95.0°F (1981) | 24.1°F (1965) | 0.98 in (1970) |
| September 20 | 88.0°F (1979) | 19.9°F (1983) | 0.88 in (2006) |
| September 21 | 90.0°F (1979) | 19.9°F (1995) | 1.44 in (2008) |
| September 22 | 86.0°F (1987) | 21.9°F (1983) | 0.67 in (2022) |
| September 23 | 89.1°F (1987) | 21.9°F (1983) | 0.82 in (2022) |
| September 24 | 91.0°F (1987) | 21.9°F (1981) | 1.34 in (1992) |
| September 25 | 93.0°F (2011) | 21.0°F (1970) | 1.30 in (1992) |
| September 26 | 89.1°F (1994) | 21.9°F (1970) | 0.47 in (1986) |
| September 27 | 84.0°F (2016) | 26.1°F (1964) | 0.50 in (1988) |
| September 28 | 89.1°F (2022) | 19.0°F (1999) | 1.25 in (1981) |
| September 29 | 89.1°F (2022) | 10.0°F (1985) | 1.16 in (1995) |
| September 30 | 88.0°F (1989) | 18.0°F (1985) | 0.72 in (1977) |