Weather on September 18
Portland, OR
55 Years of Data
Avg High
72°F
Avg Low
54°F
Warmest
1991
76°F avg
Coldest
2004
53°F avg
About This Date
September 18th in Portland, OR typically brings pleasant fall weather, with average highs around 72°F and lows near 54°F. Over 55 years of records, the warmest September 18th was in 1991 (76°F average), while the coldest was 2004 (53°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 38% of September 18th dates historically, with the wettest September 18th recording 3.56" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 18th in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 58° | 67° | — | — |
| 2024 | 68° | 58° | 63° | — | — |
| 2023 | 71° | 57° | 64° | — | — |
| 2022 | 77° | 55° | 66° | — | — |
| 2021 | 70° | 55° | 62° | 3.56" | — |
| 2020 | 66° | 59° | 63° | 0.81" | — |
| 2019 | 64° | 53° | 59° | 1.32" | — |
| 2018 | 69° | 49° | 59° | — | — |
| 2017 | 59° | 51° | 55° | 1.12" | — |
| 2016 | 70° | 54° | 62° | 0.1" | — |
| 2015 | 74° | 52° | 63° | — | — |
| 2014 | 71° | 60° | 66° | 0.38" | — |
| 2013 | 71° | 55° | 63° | — | — |
| 2012 | 87° | 57° | 72° | — | — |
| 2011 | 64° | 57° | 61° | 0.05" | — |
| 2010 | 67° | 57° | 62° | 2.54" | — |
| 2009 | 87° | 53° | 70° | — | — |
| 2008 | 63° | 57° | 60° | — | — |
| 2007 | 65° | 48° | 56° | — | — |
| 2006 | 73° | 57° | 65° | 0.64" | — |
| 2005 | 73° | 44° | 59° | — | — |
| 2004coldest | 56° | 50° | 53° | 1.93" | — |
| 2003 | 74° | 48° | 61° | — | — |
| 2002 | 75° | 50° | 63° | — | — |
| 2001 | 69° | 55° | 62° | — | — |
| 2000 | 82° | 59° | 71° | — | — |
| 1999 | 88° | 56° | 72° | — | — |
| 1998 | 69° | 57° | 63° | 1.6" | — |
| 1997 | 68° | 55° | 62° | 0.66" | — |
| 1996 | 64° | 48° | 56° | 0.05" | — |
| 1995 | 75° | 55° | 65° | — | — |
| 1994 | 79° | 57° | 68° | — | — |
| 1993 | 65° | 48° | 56° | — | — |
| 1992 | 79° | 53° | 66° | — | — |
| 1991warmest | 90° | 62° | 76° | — | — |
| 1990 | 77° | 55° | 66° | — | — |
| 1989 | 69° | 45° | 57° | — | — |
| 1988 | 68° | 44° | 56° | 0.33" | — |
| 1987 | 77° | 53° | 65° | — | — |
| 1986 | 67° | 50° | 58° | — | — |
| 1985 | 66° | 47° | 56° | 0.03" | — |
| 1984 | 81° | 61° | 71° | — | — |
| 1983 | 64° | 47° | 55° | 0.18" | — |
| 1982 | 79° | 54° | 66° | — | — |
| 1981 | 78° | 56° | 67° | 0.58" | — |
| 1980 | 62° | 54° | 58° | 0.97" | — |
| 1979 | 85° | 58° | 71° | — | — |
| 1978 | 67° | 46° | 56° | — | — |
| 1977 | 63° | 55° | 59° | 0.81" | — |
| 1976 | 73° | 52° | 62° | — | — |
| 1975 | 78° | 51° | 65° | — | — |
| 1974 | 87° | 59° | 73° | — | — |
| 1973 | 69° | 57° | 63° | 0.15" | — |
| 1972 | 61° | 51° | 56° | 1.27" | — |
| 1971 | 80° | 56° | 68° | — | — |
55 years of data from PORTLAND KGW-TV