September weather in Ketchikan, AK
The average temperature in Ketchikan in September is 55.2°F (50.4°F–60.0°F). Average precipitation: 17.68 inches.
September is a fall month in Ketchikan, and is warmer than the annual average of 47.3°F. Daily temperatures swing about 9.6°F between overnight low and afternoon high. Expect about 22 days with precipitation. Daylight averages about 12h 26m. For travel, September is a wet month.
Avg High
60.0°F
Avg Low
50.4°F
Precipitation
17.68 in
Daylight
12h 26m
September records in Ketchikan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 78.1°F (1974) | 37.0°F (1991) | 2.96 in (2006) |
| September 2 | 75.9°F (1974) | 42.1°F (1953) | 8.43 in (2010) |
| September 3 | 75.9°F (1974) | 32.0°F (2006) | 4.34 in (1991) |
| September 4 | 73.9°F (1972) | 42.1°F (1958) | 4.20 in (1966) |
| September 5 | 75.0°F (1949) | 37.9°F (2006) | 2.58 in (1981) |
| September 6 | 75.9°F (1986) | 37.0°F (2006) | 5.40 in (2011) |
| September 7 | 75.9°F (1989) | 34.0°F (2006) | 2.74 in (1957) |
| September 8 | 78.1°F (1989) | 37.9°F (2006) | 3.72 in (2011) |
| September 9 | 78.1°F (1989) | 39.9°F (1952) | 3.36 in (1948) |
| September 10 | 77.0°F (1956) | 37.0°F (2006) | 1.73 in (2009) |
| September 11 | 75.9°F (2013) | 39.0°F (2006) | 3.87 in (2015) |
| September 12 | 75.0°F (1956) | 39.0°F (1970) | 4.81 in (2012) |
| September 13 | 75.0°F (1956) | 26.1°F (2006) | 4.81 in (1952) |
| September 14 | 75.0°F (1956) | 25.0°F (2006) | 3.08 in (1967) |
| September 15 | 78.1°F (1951) | 28.0°F (2006) | 3.80 in (1981) |
| September 16 | 73.9°F (1951) | 32.0°F (2006) | 4.93 in (1953) |
| September 17 | 71.1°F (1957) | 37.0°F (1983) | 2.38 in (1961) |
| September 18 | 66.9°F (1982) | 28.9°F (2006) | 3.17 in (2015) |
| September 19 | 70.0°F (2010) | 30.9°F (2006) | 6.23 in (1997) |
| September 20 | 69.1°F (1973) | 39.0°F (1993) | 5.24 in (1985) |
| September 21 | 71.1°F (1951) | 37.0°F (1972) | 4.97 in (1949) |
| September 22 | 69.1°F (1952) | 37.0°F (1956) | 6.00 in (1949) |
| September 23 | 69.1°F (1951) | 37.0°F (1956) | 6.70 in (1967) |
| September 24 | 66.9°F (1974) | 36.0°F (1972) | 3.57 in (2006) |
| September 25 | 64.9°F (1962) | 33.1°F (1972) | 5.81 in (1948) |
| September 26 | 66.0°F (2014) | 32.0°F (1972) | 4.11 in (1970) |
| September 27 | 64.9°F (1965) | 34.0°F (1983) | 3.13 in (2014) |
| September 28 | 71.1°F (2003) | 37.0°F (1971) | 4.82 in (2008) |
| September 29 | 71.1°F (1996) | 35.1°F (1992) | 5.68 in (1972) |
| September 30 | 68.0°F (1996) | 33.1°F (2006) | 5.50 in (1987) |