September weather in Maple Valley, WA
The average temperature in Maple Valley in September is 58.8°F (46.9°F–70.6°F). Average precipitation: 2.83 inches.
September is a fall month in Maple Valley, and is warmer than the annual average of 50.5°F. Daily temperatures swing about 23.7°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
70.6°F
Avg Low
46.9°F
Precipitation
2.83 in
Daylight
12h 19m
September records in Maple Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2022) | 30.0°F (1925) | 1.79 in (1936) |
| September 2 | 97.0°F (2006) | 34.0°F (1960) | 2.00 in (1971) |
| September 3 | 93.9°F (2022) | 35.1°F (1956) | 0.87 in (1911) |
| September 4 | 90.0°F (2003) | 36.0°F (1956) | 2.35 in (1945) |
| September 5 | 91.9°F (2024) | 36.0°F (1947) | 1.01 in (1937) |
| September 6 | 93.0°F (2024) | 37.0°F (1961) | 1.19 in (1931) |
| September 7 | 95.0°F (1981) | 35.1°F (1929) | 0.58 in (1964) |
| September 8 | 90.0°F (1943) | 30.9°F (1928) | 0.90 in (1927) |
| September 9 | 93.0°F (1963) | 30.9°F (1928) | 1.10 in (1982) |
| September 10 | 95.0°F (2020) | 32.0°F (1928) | 1.45 in (2005) |
| September 11 | 91.0°F (2013) | 34.0°F (1936) | 1.20 in (1919) |
| September 12 | 88.0°F (1924) | 35.1°F (1949) | 1.36 in (1920) |
| September 13 | 93.9°F (1999) | 28.0°F (1970) | 0.92 in (1934) |
| September 14 | 93.0°F (1937) | 33.1°F (1921) | 2.00 in (1935) |
| September 15 | 95.0°F (1967) | 30.9°F (1939) | 1.61 in (1911) |
| September 16 | 93.9°F (1967) | 30.9°F (1928) | 2.26 in (1947) |
| September 17 | 89.1°F (1938) | 33.1°F (1965) | 1.34 in (1964) |
| September 18 | 84.0°F (1991) | 33.1°F (1965) | 1.40 in (2021) |
| September 19 | 82.9°F (1927) | 33.1°F (1957) | 0.95 in (1969) |
| September 20 | 91.9°F (1974) | 33.1°F (1925) | 2.70 in (1945) |
| September 21 | 91.9°F (1952) | 32.0°F (1928) | 1.35 in (1972) |
| September 22 | 93.9°F (1928) | 23.0°F (2000) | 1.52 in (1969) |
| September 23 | 91.0°F (1943) | 32.0°F (1961) | 1.48 in (2020) |
| September 24 | 89.1°F (1974) | 30.9°F (1970) | 0.90 in (1971) |
| September 25 | 87.1°F (1925) | 30.0°F (1926) | 1.00 in (1950) |
| September 26 | 86.0°F (2022) | 32.0°F (1929) | 1.75 in (1959) |
| September 27 | 90.0°F (1967) | 28.9°F (1972) | 1.30 in (1940) |
| September 28 | 84.0°F (1932) | 30.0°F (1983) | 1.88 in (2013) |
| September 29 | 90.0°F (1920) | 30.0°F (2023) | 0.96 in (2005) |
| September 30 | 80.1°F (1920) | 30.0°F (1948) | 1.73 in (2013) |