September weather in Stanley, ID
The average temperature in Stanley in September is 47.7°F (25.0°F–70.3°F). Average precipitation: 1.01 inches.
September is a fall month in Stanley, and is warmer than the annual average of 34.4°F. Daily temperatures swing about 45.3°F between overnight low and afternoon high. Daylight averages about 12h 17m. For travel, September is cool.
Avg High
70.3°F
Avg Low
25.0°F
Precipitation
1.01 in
Daylight
12h 17m
September records in Stanley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (2022) | 16.0°F (2021) | 1.00 in (2000) |
| September 2 | 89.1°F (2025) | 17.1°F (2021) | 0.26 in (1921) |
| September 3 | 90.0°F (2017) | 19.0°F (1980) | 0.43 in (2023) |
| September 4 | 91.9°F (2017) | 15.1°F (2021) | 0.70 in (2015) |
| September 5 | 91.0°F (2020) | 16.0°F (1921) | 0.49 in (1978) |
| September 6 | 90.0°F (2020) | 12.0°F (1923) | 0.78 in (1984) |
| September 7 | 91.0°F (2022) | 16.0°F (1923) | 0.43 in (1918) |
| September 8 | 89.1°F (2022) | 18.0°F (1923) | 0.45 in (1965) |
| September 9 | 89.1°F (2021) | 15.1°F (2020) | 0.60 in (1986) |
| September 10 | 87.1°F (2021) | 12.9°F (1964) | 0.45 in (1980) |
| September 11 | 84.0°F (1968) | 14.0°F (1921) | 0.32 in (1991) |
| September 12 | 84.9°F (1990) | 10.0°F (1921) | 0.65 in (1976) |
| September 13 | 88.0°F (1981) | 15.1°F (2012) | 0.25 in (1963) |
| September 14 | 84.0°F (2009) | 15.1°F (1984) | 0.63 in (1918) |
| September 15 | 87.1°F (2000) | 16.0°F (1921) | 0.50 in (2015) |
| September 16 | 84.9°F (2000) | 10.9°F (1921) | 0.44 in (2015) |
| September 17 | 84.9°F (1981) | 10.0°F (1965) | 0.45 in (1976) |
| September 18 | 86.0°F (1981) | 10.9°F (1971) | 0.70 in (1919) |
| September 19 | 86.0°F (1922) | 10.9°F (1926) | 0.79 in (2017) |
| September 20 | 84.9°F (1922) | 12.9°F (1983) | 0.47 in (1973) |
| September 21 | 82.0°F (1966) | 10.9°F (1916) | 0.47 in (1984) |
| September 22 | 84.0°F (1987) | 12.0°F (1993) | 0.40 in (1918) |
| September 23 | 84.0°F (1922) | 10.0°F (1926) | 0.46 in (1920) |
| September 24 | 86.0°F (1922) | 1.9°F (1926) | 0.42 in (1977) |
| September 25 | 84.9°F (1922) | 1.0°F (1926) | 0.36 in (1981) |
| September 26 | 82.9°F (2001) | 1.9°F (1926) | 0.42 in (2020) |
| September 27 | 86.0°F (1967) | 1.9°F (1926) | 0.14 in (1982) |
| September 28 | 82.9°F (1967) | 10.0°F (1999) | 0.05 in (1965) |
| September 29 | 82.9°F (2003) | 9.0°F (1985) | 0.80 in (2025) |
| September 30 | 81.0°F (2010) | 10.9°F (2021) | 0.74 in (2014) |