September weather in Federal Way, WA
The average temperature in Federal Way in September is 61.9°F (53.0°F–70.7°F). Average precipitation: 1.57 inches.
September is a fall month in Federal Way, and is warmer than the annual average of 53.7°F. Daily temperatures swing about 17.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 19m. For travel, September is one of the best months of the year to visit.
Avg High
70.7°F
Avg Low
53.0°F
Precipitation
1.57 in
Daylight
12h 19m
September records in Federal Way
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 89.1°F (1987) | 42.1°F (1984) | 0.42 in (1983) |
| September 2 | 88.0°F (1987) | 41.0°F (2000) | 0.19 in (2000) |
| September 3 | 87.1°F (1988) | 43.0°F (1984) | 0.31 in (1996) |
| September 4 | 84.9°F (1988) | 46.9°F (1999) | 0.43 in (2007) |
| September 5 | 84.0°F (2024) | 46.0°F (2002) | 0.51 in (2009) |
| September 6 | 87.1°F (1986) | 46.9°F (1983) | 1.43 in (2013) |
| September 7 | 84.0°F (1986) | 42.1°F (1992) | 0.32 in (2009) |
| September 8 | 84.9°F (2003) | 44.1°F (1983) | 0.80 in (2010) |
| September 9 | 82.9°F (2020) | 42.1°F (1984) | 0.61 in (1982) |
| September 10 | 84.9°F (2020) | 43.0°F (1999) | 0.48 in (2018) |
| September 11 | 82.9°F (1993) | 39.9°F (1988) | 0.95 in (2004) |
| September 12 | 82.9°F (1993) | 43.0°F (1984) | 0.32 in (2004) |
| September 13 | 82.0°F (2009) | 44.1°F (1984) | 0.38 in (2019) |
| September 14 | 87.1°F (2000) | 42.1°F (1984) | 0.44 in (1987) |
| September 15 | 82.9°F (2000) | 43.0°F (1982) | 0.42 in (2019) |
| September 16 | 82.0°F (1984) | 39.9°F (1992) | 0.60 in (2018) |
| September 17 | 80.1°F (1984) | 42.1°F (1987) | 1.24 in (2021) |
| September 18 | 81.0°F (1984) | 39.9°F (1988) | 0.96 in (2010) |
| September 19 | 81.0°F (2009) | 37.0°F (1983) | 0.80 in (2024) |
| September 20 | 80.1°F (1987) | 42.1°F (1983) | 0.51 in (2017) |
| September 21 | 81.0°F (1995) | 39.9°F (1993) | 0.38 in (2025) |
| September 22 | 82.0°F (1990) | 39.9°F (1993) | 0.53 in (2013) |
| September 23 | 82.0°F (2009) | 37.9°F (2000) | 0.96 in (2020) |
| September 24 | 82.0°F (2009) | 39.0°F (2000) | 1.19 in (2014) |
| September 25 | 80.1°F (2021) | 37.0°F (1982) | 0.68 in (2023) |
| September 26 | 77.0°F (1991) | 41.0°F (1983) | 0.45 in (1997) |
| September 27 | 78.1°F (2022) | 41.0°F (1984) | 0.81 in (1995) |
| September 28 | 82.0°F (2017) | 35.1°F (1983) | 1.87 in (2013) |
| September 29 | 75.9°F (1984) | 34.0°F (1983) | 1.24 in (2013) |
| September 30 | 77.0°F (1987) | 35.1°F (1985) | 1.47 in (2013) |