September weather in Montesano, WA
The average temperature in Montesano in September is 61.4°F (47.7°F–75.1°F). Average precipitation: 2.67 inches.
September is a fall month in Montesano, and is warmer than the annual average of 52.3°F. Daily temperatures swing about 27.4°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
75.1°F
Avg Low
47.7°F
Precipitation
2.67 in
Daylight
12h 19m
September records in Montesano
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1987) | 37.0°F (1973) | 1.24 in (1971) |
| September 2 | 100.0°F (1988) | 36.0°F (1956) | 1.52 in (1941) |
| September 3 | 100.0°F (1988) | 37.0°F (1956) | 2.11 in (1945) |
| September 4 | 93.9°F (2017) | 35.1°F (1956) | 1.16 in (1959) |
| September 5 | 96.1°F (2024) | 37.9°F (1947) | 2.28 in (1984) |
| September 6 | 100.0°F (1944) | 33.1°F (1992) | 0.67 in (2016) |
| September 7 | 96.1°F (2024) | 33.1°F (1992) | 1.06 in (1970) |
| September 8 | 93.0°F (1981) | 37.0°F (2001) | 0.86 in (1972) |
| September 9 | 93.9°F (2020) | 37.9°F (1945) | 0.65 in (1978) |
| September 10 | 93.9°F (2020) | 37.0°F (1970) | 1.19 in (1983) |
| September 11 | 93.9°F (1944) | 34.0°F (1988) | 1.61 in (2024) |
| September 12 | 95.0°F (2013) | 30.0°F (1949) | 0.61 in (2018) |
| September 13 | 93.0°F (1999) | 28.9°F (1970) | 0.92 in (1962) |
| September 14 | 93.9°F (1957) | 36.0°F (1991) | 1.14 in (1985) |
| September 15 | 95.0°F (1967) | 35.1°F (1969) | 1.93 in (1997) |
| September 16 | 93.0°F (1967) | 35.1°F (2021) | 1.02 in (2010) |
| September 17 | 88.0°F (2008) | 32.0°F (1965) | 3.12 in (1997) |
| September 18 | 88.0°F (1991) | 30.9°F (1947) | 1.54 in (2021) |
| September 19 | 90.0°F (1999) | 30.0°F (1947) | 1.72 in (1988) |
| September 20 | 91.0°F (1974) | 33.1°F (1983) | 0.56 in (1977) |
| September 21 | 90.0°F (1974) | 30.0°F (2002) | 2.22 in (1972) |
| September 22 | 91.9°F (1952) | 30.0°F (1993) | 2.12 in (1978) |
| September 23 | 90.0°F (1947) | 28.9°F (2000) | 2.48 in (1978) |
| September 24 | 90.0°F (1997) | 28.9°F (2000) | 0.88 in (2014) |
| September 25 | 91.9°F (1943) | 30.9°F (2000) | 1.08 in (2020) |
| September 26 | 87.1°F (2022) | 32.0°F (1972) | 1.50 in (2011) |
| September 27 | 89.1°F (2003) | 28.9°F (1972) | 2.30 in (2021) |
| September 28 | 91.0°F (2017) | 30.0°F (1999) | 2.15 in (2013) |
| September 29 | 90.0°F (2017) | 28.0°F (1985) | 1.35 in (1944) |
| September 30 | 84.0°F (1987) | 28.0°F (1983) | 1.50 in (1951) |