September weather in Leavenworth, WA
The average temperature in Leavenworth in September is 59.8°F (41.7°F–77.9°F). Average precipitation: 0.76 inches.
September is a fall month in Leavenworth, and is warmer than the annual average of 47.3°F. Daily temperatures swing about 36.2°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
77.9°F
Avg Low
41.7°F
Precipitation
0.76 in
Daylight
12h 19m
September records in Leavenworth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1938) | 34.0°F (1980) | 0.49 in (1961) |
| September 2 | 102.0°F (2025) | 33.1°F (1960) | 0.62 in (2004) |
| September 3 | 102.0°F (1988) | 30.9°F (1980) | 0.18 in (1970) |
| September 4 | 100.0°F (1988) | 34.0°F (1980) | 0.46 in (1945) |
| September 5 | 100.9°F (1988) | 33.1°F (1922) | 0.15 in (1935) |
| September 6 | 99.0°F (2003) | 32.0°F (1960) | 0.82 in (2013) |
| September 7 | 100.9°F (1944) | 30.0°F (1936) | 0.86 in (2013) |
| September 8 | 102.0°F (1944) | 32.0°F (1922) | 0.30 in (1924) |
| September 9 | 99.0°F (1940) | 32.0°F (1980) | 0.52 in (2000) |
| September 10 | 98.1°F (1944) | 34.0°F (1964) | 0.64 in (1941) |
| September 11 | 104.0°F (1944) | 32.0°F (1941) | 0.62 in (1956) |
| September 12 | 99.0°F (1943) | 32.0°F (1962) | 0.24 in (1934) |
| September 13 | 98.1°F (2011) | 25.0°F (1970) | 0.31 in (1920) |
| September 14 | 97.0°F (1938) | 32.0°F (1916) | 0.56 in (1980) |
| September 15 | 100.0°F (1938) | 28.9°F (1921) | 0.45 in (1996) |
| September 16 | 99.0°F (1938) | 30.0°F (1973) | 0.73 in (1944) |
| September 17 | 99.0°F (1938) | 28.0°F (1971) | 0.63 in (1954) |
| September 18 | 98.1°F (1981) | 28.9°F (1971) | 0.66 in (1986) |
| September 19 | 95.0°F (1981) | 28.9°F (1926) | 0.36 in (1983) |
| September 20 | 93.9°F (1994) | 27.0°F (1983) | 0.47 in (1964) |
| September 21 | 96.1°F (1939) | 28.9°F (1961) | 0.95 in (1972) |
| September 22 | 93.0°F (1938) | 28.0°F (1961) | 0.50 in (1973) |
| September 23 | 93.9°F (1990) | 25.0°F (1926) | 1.25 in (1984) |
| September 24 | 96.1°F (1967) | 19.0°F (1926) | 0.85 in (2023) |
| September 25 | 91.9°F (1990) | 27.0°F (1972) | 0.40 in (1959) |
| September 26 | 91.9°F (1994) | 28.9°F (1972) | 0.86 in (1959) |
| September 27 | 91.9°F (1967) | 26.1°F (1926) | 1.20 in (1940) |
| September 28 | 95.0°F (1967) | 27.0°F (1983) | 0.63 in (1962) |
| September 29 | 91.9°F (1994) | 24.1°F (1983) | 0.76 in (2013) |
| September 30 | 91.9°F (1993) | 24.1°F (1983) | 0.90 in (2013) |