September weather in Blaine, WA
The average temperature in Blaine in September is 58.6°F (50.4°F–66.9°F). Average precipitation: 2.22 inches.
September is a fall month in Blaine, and is warmer than the annual average of 50.9°F. Daily temperatures swing about 16.5°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
66.9°F
Avg Low
50.4°F
Precipitation
2.22 in
Daylight
12h 20m
September records in Blaine
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 82.0°F (1918) | 37.0°F (1898) | 2.20 in (1983) |
| September 2 | 86.0°F (2017) | 36.0°F (1932) | 0.59 in (1912) |
| September 3 | 84.9°F (1918) | 37.9°F (1903) | 1.24 in (1941) |
| September 4 | 87.1°F (2017) | 37.9°F (1912) | 0.70 in (1913) |
| September 5 | 84.0°F (1898) | 35.1°F (1898) | 0.87 in (1931) |
| September 6 | 84.0°F (1898) | 33.1°F (1895) | 1.40 in (1933) |
| September 7 | 84.9°F (1958) | 35.1°F (1898) | 1.67 in (1905) |
| September 8 | 82.9°F (1989) | 30.0°F (1896) | 1.03 in (1992) |
| September 9 | 82.0°F (1898) | 33.1°F (1896) | 0.95 in (1903) |
| September 10 | 79.0°F (1932) | 34.0°F (1928) | 0.81 in (1967) |
| September 11 | 79.0°F (2017) | 34.0°F (1895) | 2.20 in (1920) |
| September 12 | 81.0°F (1957) | 30.9°F (1907) | 1.19 in (1919) |
| September 13 | 84.9°F (1961) | 30.0°F (1970) | 1.15 in (1935) |
| September 14 | 84.9°F (1951) | 37.0°F (1907) | 0.75 in (1920) |
| September 15 | 80.1°F (1951) | 36.0°F (1898) | 1.31 in (1926) |
| September 16 | 80.1°F (1981) | 34.0°F (1992) | 1.14 in (1905) |
| September 17 | 82.9°F (1922) | 34.0°F (1896) | 1.72 in (2021) |
| September 18 | 79.0°F (1919) | 28.9°F (1896) | 1.35 in (1998) |
| September 19 | 78.1°F (1974) | 32.0°F (1904) | 1.07 in (1932) |
| September 20 | 84.0°F (1974) | 26.1°F (1895) | 0.89 in (1945) |
| September 21 | 80.1°F (1974) | 25.0°F (1895) | 1.07 in (1972) |
| September 22 | 78.1°F (1928) | 33.1°F (1896) | 1.45 in (1895) |
| September 23 | 79.0°F (1952) | 28.9°F (1926) | 1.70 in (1903) |
| September 24 | 78.1°F (1974) | 26.1°F (1908) | 2.00 in (1903) |
| September 25 | 75.9°F (1949) | 25.0°F (1908) | 0.97 in (1938) |
| September 26 | 73.0°F (1913) | 28.0°F (1926) | 2.09 in (1902) |
| September 27 | 75.9°F (1967) | 26.1°F (1896) | 0.80 in (1930) |
| September 28 | 75.9°F (1935) | 30.0°F (1895) | 1.01 in (2013) |
| September 29 | 75.0°F (1935) | 32.0°F (1919) | 0.98 in (2021) |
| September 30 | 73.9°F (2020) | 30.0°F (1948) | 1.02 in (1964) |