Weather on September 15
Portland, OR
55 Years of Data
Avg High
74°F
Avg Low
55°F
Warmest
1981
77°F avg
Coldest
1996
53°F avg
About This Date
September 15th in Portland, OR typically brings pleasant fall weather, with average highs around 74°F and lows near 55°F. Over 55 years of records, the warmest September 15th was in 1981 (77°F average), while the coldest was 1996 (53°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 15th dates historically, with the wettest September 15th recording 3.76" of rain. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in Portland, OR? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 50° | 62° | — | — |
| 2024 | 64° | 50° | 57° | — | — |
| 2023 | 93° | 58° | 75° | — | — |
| 2022 | 73° | 60° | 67° | — | — |
| 2021 | 70° | 55° | 62° | — | — |
| 2020 | 75° | 60° | 68° | — | — |
| 2019 | 65° | 57° | 61° | 2.34" | — |
| 2018 | 65° | 52° | 58° | — | — |
| 2017 | 79° | 52° | 65° | — | — |
| 2016 | 77° | 53° | 65° | — | — |
| 2015 | 62° | 49° | 55° | — | — |
| 2014 | 90° | 58° | 74° | — | — |
| 2013 | 66° | 60° | 63° | 0.05" | — |
| 2012 | 79° | 54° | 66° | — | — |
| 2011 | 67° | 55° | 61° | — | — |
| 2010 | 72° | 57° | 64° | 0.51" | — |
| 2009 | 84° | 58° | 71° | — | — |
| 2008 | 89° | 59° | 74° | — | — |
| 2007 | 69° | 56° | 62° | — | — |
| 2006 | 64° | 49° | 56° | 0.89" | — |
| 2005 | 67° | 56° | 61° | — | — |
| 2004 | 71° | 56° | 63° | 0.2" | — |
| 2003 | 66° | 48° | 57° | — | — |
| 2002 | 67° | 57° | 62° | — | — |
| 2001 | 81° | 62° | 71° | — | — |
| 2000 | 73° | 64° | 69° | — | — |
| 1999 | 71° | 56° | 63° | — | — |
| 1998 | 88° | 58° | 73° | — | — |
| 1997 | 61° | 56° | 58° | 0.56" | — |
| 1996coldest | 64° | 42° | 53° | 3.76" | — |
| 1995 | 78° | 60° | 69° | — | — |
| 1994 | 79° | 58° | 68° | — | — |
| 1993 | 70° | 56° | 63° | — | — |
| 1992 | 60° | 50° | 55° | 1.35" | — |
| 1991 | 82° | 55° | 69° | — | — |
| 1990 | 64° | 57° | 61° | 1.14" | — |
| 1989 | 81° | 55° | 68° | — | — |
| 1988 | 64° | 50° | 57° | — | — |
| 1987 | 64° | 49° | 56° | 0.03" | — |
| 1986 | 68° | 51° | 60° | 0.38" | — |
| 1985 | 66° | 53° | 60° | 0.56" | — |
| 1984 | 78° | 56° | 67° | — | — |
| 1983 | 78° | 55° | 67° | — | — |
| 1982 | 75° | 48° | 62° | — | — |
| 1981warmest | 96° | 58° | 77° | — | — |
| 1980 | 81° | 53° | 67° | — | — |
| 1979 | 74° | 56° | 65° | — | — |
| 1978 | 70° | 55° | 62° | — | — |
| 1977 | 67° | 54° | 60° | — | — |
| 1976 | 73° | 54° | 63° | — | — |
| 1975 | 79° | 56° | 67° | — | — |
| 1974 | 81° | 54° | 67° | — | — |
| 1973 | 74° | 50° | 62° | — | — |
| 1972 | 82° | 57° | 70° | — | — |
| 1971 | 79° | 51° | 65° | — | — |
55 years of data from PORTLAND KGW-TV