September weather in Chelan, WA
The average temperature in Chelan in September is 63.2°F (49.2°F–77.2°F). Average precipitation: 0.34 inches.
September is a fall month in Chelan, and is warmer than the annual average of 50.1°F. Daily temperatures swing about 28°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
77.2°F
Avg Low
49.2°F
Precipitation
0.34 in
Daylight
12h 20m
September records in Chelan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1974) | 44.1°F (2021) | 0.18 in (1983) |
| September 2 | 97.0°F (2022) | 43.0°F (2023) | 0.38 in (1971) |
| September 3 | 96.1°F (2025) | 42.1°F (2015) | 0.20 in (1979) |
| September 4 | 95.0°F (2025) | 43.0°F (2015) | 0.70 in (2013) |
| September 5 | 91.9°F (1967) | 42.1°F (1983) | 0.07 in (1960) |
| September 6 | 97.0°F (2003) | 39.0°F (1983) | 0.33 in (1978) |
| September 7 | 91.9°F (2020) | 42.1°F (1976) | 0.61 in (2010) |
| September 8 | 93.9°F (1998) | 37.9°F (1983) | 0.78 in (2013) |
| September 9 | 89.1°F (1963) | 39.0°F (1983) | 0.20 in (2010) |
| September 10 | 89.1°F (2024) | 39.9°F (1983) | 0.10 in (1962) |
| September 11 | 91.0°F (1963) | 39.0°F (2014) | 0.58 in (1966) |
| September 12 | 91.0°F (1993) | 35.1°F (2014) | 0.17 in (1966) |
| September 13 | 93.9°F (2015) | 35.1°F (1970) | 0.37 in (1980) |
| September 14 | 93.0°F (2001) | 39.0°F (1970) | 0.77 in (1959) |
| September 15 | 91.0°F (2009) | 39.0°F (2015) | 0.51 in (1959) |
| September 16 | 90.0°F (2007) | 39.0°F (1973) | 0.83 in (1986) |
| September 17 | 90.0°F (1967) | 37.0°F (1965) | 0.31 in (1978) |
| September 18 | 87.1°F (1967) | 37.9°F (1983) | 0.74 in (1986) |
| September 19 | 91.9°F (1981) | 36.0°F (1983) | 0.23 in (2010) |
| September 20 | 91.0°F (1967) | 27.0°F (1983) | 0.51 in (1973) |
| September 21 | 84.9°F (1967) | 30.9°F (1983) | 0.20 in (2017) |
| September 22 | 87.1°F (1962) | 33.1°F (1983) | 0.21 in (1969) |
| September 23 | 87.1°F (1987) | 34.0°F (1983) | 1.17 in (1973) |
| September 24 | 86.0°F (2009) | 35.1°F (1958) | 0.46 in (1977) |
| September 25 | 89.1°F (2001) | 34.0°F (1983) | 0.35 in (2023) |
| September 26 | 90.0°F (2009) | 39.0°F (1961) | 0.33 in (1982) |
| September 27 | 89.1°F (2003) | 28.9°F (1983) | 0.41 in (1981) |
| September 28 | 84.9°F (2003) | 27.0°F (1983) | 0.11 in (1977) |
| September 29 | 86.0°F (2003) | 26.1°F (1983) | 0.35 in (2019) |
| September 30 | 82.0°F (1963) | 33.1°F (1985) | 0.38 in (2019) |