September weather in Sequim, WA
The average temperature in Sequim in September is 56.0°F (46.2°F–65.9°F). Average precipitation: 0.87 inches.
September is a fall month in Sequim, and is warmer than the annual average of 48.9°F. Daily temperatures swing about 19.7°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
65.9°F
Avg Low
46.2°F
Precipitation
0.87 in
Daylight
12h 20m
September records in Sequim
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 81.0°F (1987) | 39.0°F (1999) | 1.10 in (1983) |
| September 2 | 82.0°F (1988) | 35.1°F (1984) | 0.61 in (1983) |
| September 3 | 78.1°F (1988) | 39.9°F (1989) | 0.60 in (1996) |
| September 4 | 87.1°F (2017) | 39.9°F (2002) | 0.30 in (1982) |
| September 5 | 87.1°F (2017) | 39.9°F (1994) | 0.34 in (2013) |
| September 6 | 79.0°F (1986) | 34.0°F (1992) | 0.72 in (1984) |
| September 7 | 82.0°F (2024) | 35.1°F (1992) | 0.26 in (2003) |
| September 8 | 81.0°F (2011) | 37.9°F (2001) | 0.48 in (2019) |
| September 9 | 82.0°F (1989) | 36.0°F (2000) | 0.11 in (1983) |
| September 10 | 79.0°F (1989) | 37.0°F (1988) | 0.21 in (1994) |
| September 11 | 78.1°F (1989) | 37.0°F (1986) | 0.13 in (2003) |
| September 12 | 78.1°F (2009) | 37.0°F (1994) | 0.15 in (2019) |
| September 13 | 73.0°F (1988) | 33.1°F (1992) | 0.20 in (2019) |
| September 14 | 75.0°F (2017) | 35.1°F (1984) | 0.44 in (2019) |
| September 15 | 75.9°F (1995) | 33.1°F (1992) | 0.46 in (1996) |
| September 16 | 75.0°F (1995) | 30.9°F (1992) | 0.42 in (2007) |
| September 17 | 78.1°F (2025) | 35.1°F (1987) | 0.71 in (2021) |
| September 18 | 77.0°F (1991) | 30.9°F (1988) | 0.82 in (1983) |
| September 19 | 73.0°F (2022) | 34.0°F (1983) | 0.36 in (1981) |
| September 20 | 73.0°F (2015) | 33.1°F (1983) | 0.25 in (2008) |
| September 21 | 77.0°F (2022) | 30.9°F (2000) | 0.41 in (2025) |
| September 22 | 78.1°F (1994) | 32.0°F (2000) | 0.25 in (1984) |
| September 23 | 75.9°F (2022) | 33.1°F (1996) | 0.36 in (2019) |
| September 24 | 72.0°F (2002) | 30.9°F (1984) | 0.64 in (1992) |
| September 25 | 73.0°F (1991) | 34.0°F (1996) | 0.48 in (1988) |
| September 26 | 73.0°F (2006) | 33.1°F (2001) | 0.37 in (2021) |
| September 27 | 73.9°F (2003) | 32.0°F (2001) | 0.40 in (1997) |
| September 28 | 81.0°F (2003) | 32.0°F (1984) | 0.61 in (2013) |
| September 29 | 70.0°F (2018) | 30.9°F (1983) | 0.45 in (2021) |
| September 30 | 72.0°F (1989) | 30.9°F (1985) | 0.29 in (2013) |