September weather in Kennewick, WA
The average temperature in Kennewick in September is 66.8°F (53.2°F–80.5°F). Average precipitation: 0.26 inches.
September is a fall month in Kennewick, and is warmer than the annual average of 55.1°F. Daily temperatures swing about 27.3°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
80.5°F
Avg Low
53.2°F
Precipitation
0.26 in
Daylight
12h 19m
September records in Kennewick
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1911) | 39.0°F (1924) | 0.63 in (1971) |
| September 2 | 100.0°F (1911) | 39.0°F (1924) | 0.29 in (1941) |
| September 3 | 99.0°F (1998) | 39.9°F (1929) | 0.14 in (1979) |
| September 4 | 100.0°F (1911) | 37.9°F (1912) | 0.91 in (1911) |
| September 5 | 98.1°F (1904) | 37.9°F (1895) | 0.28 in (1911) |
| September 6 | 98.1°F (1904) | 39.9°F (1895) | 0.30 in (1946) |
| September 7 | 99.0°F (1944) | 39.0°F (1915) | 0.44 in (1927) |
| September 8 | 97.0°F (1944) | 37.9°F (1922) | 0.29 in (1924) |
| September 9 | 100.0°F (1940) | 37.9°F (1895) | 0.30 in (2010) |
| September 10 | 97.0°F (1907) | 34.0°F (1915) | 0.25 in (2000) |
| September 11 | 98.1°F (1973) | 37.9°F (1910) | 0.35 in (1896) |
| September 12 | 97.0°F (1943) | 28.9°F (1921) | 0.42 in (1895) |
| September 13 | 95.0°F (1922) | 28.0°F (1921) | 0.81 in (1980) |
| September 14 | 95.0°F (1938) | 30.9°F (1926) | 0.77 in (1980) |
| September 15 | 96.1°F (1938) | 32.0°F (1921) | 0.60 in (1959) |
| September 16 | 97.0°F (1938) | 34.0°F (1936) | 0.42 in (2013) |
| September 17 | 95.0°F (1913) | 32.0°F (1965) | 0.22 in (2019) |
| September 18 | 97.0°F (1906) | 30.0°F (1907) | 0.31 in (1969) |
| September 19 | 97.0°F (1981) | 32.0°F (1957) | 0.40 in (2010) |
| September 20 | 93.9°F (1939) | 35.1°F (1895) | 0.29 in (2010) |
| September 21 | 93.9°F (1896) | 30.9°F (1907) | 0.38 in (2017) |
| September 22 | 95.0°F (1939) | 34.0°F (1955) | 0.15 in (1926) |
| September 23 | 93.0°F (1942) | 34.0°F (1926) | 0.35 in (1984) |
| September 24 | 91.9°F (1899) | 21.0°F (1926) | 0.24 in (1977) |
| September 25 | 93.0°F (1942) | 26.1°F (1926) | 0.06 in (1911) |
| September 26 | 91.9°F (1897) | 25.0°F (1926) | 0.51 in (1982) |
| September 27 | 89.1°F (1994) | 28.9°F (1926) | 0.67 in (1925) |
| September 28 | 89.1°F (1918) | 33.1°F (1945) | 0.66 in (1930) |
| September 29 | 89.1°F (2010) | 28.9°F (1919) | 0.40 in (1927) |
| September 30 | 87.1°F (1906) | 32.0°F (1933) | 0.45 in (1942) |