September weather in Vernonia, OR
The average temperature in Vernonia in September is 58.0°F (42.9°F–73.1°F). Average precipitation: 1.79 inches.
September is a fall month in Vernonia, and is warmer than the annual average of 49.4°F. Daily temperatures swing about 30.2°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.1°F
Avg Low
42.9°F
Precipitation
1.79 in
Daylight
12h 18m
September records in Vernonia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1987) | 34.0°F (2006) | 0.59 in (1971) |
| September 2 | 95.0°F (2017) | 34.0°F (1973) | 0.43 in (1971) |
| September 3 | 102.9°F (1988) | 34.0°F (1973) | 2.05 in (2000) |
| September 4 | 93.9°F (1988) | 35.1°F (1975) | 0.50 in (1978) |
| September 5 | 98.1°F (2024) | 34.0°F (2001) | 1.38 in (2013) |
| September 6 | 95.0°F (2024) | 34.0°F (1992) | 0.46 in (1984) |
| September 7 | 93.0°F (2011) | 32.0°F (1992) | 0.44 in (1970) |
| September 8 | 98.1°F (1981) | 34.0°F (2007) | 0.70 in (2019) |
| September 9 | 90.0°F (2020) | 33.1°F (1989) | 0.78 in (2019) |
| September 10 | 91.0°F (2007) | 32.0°F (2012) | 1.28 in (2005) |
| September 11 | 96.1°F (2013) | 30.9°F (1988) | 0.75 in (1978) |
| September 12 | 89.1°F (1975) | 30.9°F (1970) | 0.60 in (1982) |
| September 13 | 90.0°F (1975) | 26.1°F (1970) | 0.41 in (1985) |
| September 14 | 93.0°F (1979) | 27.0°F (1970) | 0.78 in (1976) |
| September 15 | 91.9°F (1967) | 30.9°F (2021) | 1.25 in (1996) |
| September 16 | 97.0°F (1981) | 30.0°F (1973) | 0.45 in (1986) |
| September 17 | 89.1°F (1991) | 30.9°F (1971) | 1.21 in (1997) |
| September 18 | 88.0°F (1991) | 30.9°F (1971) | 2.00 in (2020) |
| September 19 | 90.0°F (1999) | 32.0°F (1971) | 1.02 in (2017) |
| September 20 | 91.9°F (1974) | 28.9°F (2005) | 0.90 in (1973) |
| September 21 | 91.9°F (1974) | 28.9°F (2005) | 1.24 in (1972) |
| September 22 | 91.0°F (2009) | 23.0°F (2000) | 0.56 in (1973) |
| September 23 | 91.9°F (1994) | 23.0°F (2000) | 1.03 in (2020) |
| September 24 | 91.9°F (1974) | 25.0°F (2000) | 1.03 in (1986) |
| September 25 | 93.0°F (1974) | 25.0°F (2000) | 0.60 in (1988) |
| September 26 | 89.1°F (1967) | 28.9°F (2000) | 0.89 in (1986) |
| September 27 | 91.9°F (1967) | 27.0°F (1999) | 1.02 in (2013) |
| September 28 | 86.0°F (1989) | 27.0°F (1999) | 1.68 in (2013) |
| September 29 | 89.1°F (2008) | 26.1°F (1985) | 1.48 in (2013) |
| September 30 | 88.0°F (1993) | 25.0°F (1985) | 0.61 in (2000) |