September weather in Bellingham, WA
The average temperature in Bellingham in September is 59.3°F (50.0°F–68.6°F). Average precipitation: 1.98 inches.
September is a fall month in Bellingham, and is warmer than the annual average of 51.9°F. Daily temperatures swing about 18.6°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 20m. For travel, September is one of the best months of the year to visit.
Avg High
68.6°F
Avg Low
50.0°F
Precipitation
1.98 in
Daylight
12h 20m
September records in Bellingham
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 82.9°F (1998) | 39.0°F (2021) | 0.34 in (2015) |
| September 2 | 84.9°F (2017) | 43.0°F (2021) | 1.75 in (2015) |
| September 3 | 82.9°F (2017) | 42.1°F (2021) | 0.80 in (1996) |
| September 4 | 82.0°F (1988) | 44.1°F (2015) | 0.26 in (2023) |
| September 5 | 81.0°F (1986) | 43.0°F (2015) | 0.26 in (1992) |
| September 6 | 84.0°F (1986) | 45.0°F (2002) | 1.17 in (1985) |
| September 7 | 84.0°F (1986) | 43.0°F (2021) | 0.74 in (2009) |
| September 8 | 84.0°F (1986) | 45.0°F (1988) | 0.76 in (1996) |
| September 9 | 82.9°F (1989) | 45.0°F (1988) | 0.25 in (2004) |
| September 10 | 78.1°F (2020) | 44.1°F (1988) | 0.39 in (1986) |
| September 11 | 80.1°F (2017) | 43.0°F (1988) | 0.39 in (2004) |
| September 12 | 78.1°F (2009) | 39.9°F (2012) | 0.76 in (2021) |
| September 13 | 77.0°F (1999) | 43.0°F (2012) | 0.55 in (2019) |
| September 14 | 78.1°F (2017) | 42.1°F (2021) | 1.40 in (2021) |
| September 15 | 75.0°F (2000) | 39.0°F (2017) | 1.29 in (2019) |
| September 16 | 73.9°F (2017) | 36.0°F (2021) | 2.32 in (1987) |
| September 17 | 79.0°F (1991) | 41.0°F (2021) | 0.86 in (1997) |
| September 18 | 75.0°F (2022) | 37.9°F (1994) | 1.58 in (2021) |
| September 19 | 75.0°F (2013) | 37.9°F (2007) | 0.71 in (2006) |
| September 20 | 82.9°F (1995) | 43.0°F (2004) | 0.31 in (1992) |
| September 21 | 75.9°F (2011) | 39.9°F (2002) | 0.48 in (2015) |
| September 22 | 77.0°F (1997) | 39.0°F (1993) | 0.55 in (2013) |
| September 23 | 79.0°F (2011) | 37.0°F (1996) | 0.74 in (1986) |
| September 24 | 77.0°F (1995) | 39.0°F (2000) | 1.91 in (1992) |
| September 25 | 75.9°F (2010) | 39.9°F (1986) | 0.49 in (1988) |
| September 26 | 73.0°F (2010) | 41.0°F (2013) | 0.61 in (2019) |
| September 27 | 73.0°F (2006) | 39.0°F (2009) | 0.35 in (2013) |
| September 28 | 78.1°F (2018) | 37.9°F (1985) | 0.56 in (2013) |
| September 29 | 72.0°F (2001) | 39.9°F (1985) | 0.60 in (2005) |
| September 30 | 71.1°F (1992) | 37.0°F (2019) | 0.88 in (2013) |