Weather on September 1
Portland, OR
55 Years of Data
Avg High
78°F
Avg Low
57°F
Warmest
1987
79°F avg
Coldest
1975
57°F avg
About This Date
September 1st in Portland, OR typically brings pleasant fall weather, with average highs around 78°F and lows near 57°F. Over 55 years of records, the warmest September 1st was in 1987 (79°F average), while the coldest was 1975 (57°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 20% of September 1st dates historically, with the wettest September 1st recording 3.86" of rain. The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.1°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Portland, OR? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 59° | 69° | — | — |
| 2024 | 85° | 61° | 73° | — | — |
| 2023 | 78° | 60° | 69° | 0.03" | — |
| 2022 | 86° | 58° | 72° | — | — |
| 2021 | 75° | 51° | 63° | — | — |
| 2020 | 85° | 62° | 73° | — | — |
| 2019 | 83° | 58° | 70° | — | — |
| 2018 | 72° | 51° | 61° | — | — |
| 2017 | 89° | 60° | 75° | — | — |
| 2016 | 67° | 57° | 62° | 0.18" | — |
| 2015 | 74° | 59° | 66° | — | — |
| 2014 | 79° | 56° | 67° | — | — |
| 2013 | 84° | 59° | 72° | — | — |
| 2012 | 74° | 49° | 61° | — | — |
| 2011 | 76° | — | — | — | — |
| 2010 | 72° | 59° | 65° | 0.36" | — |
| 2009 | 76° | 57° | 66° | — | — |
| 2008 | 69° | 47° | 58° | — | — |
| 2007 | 84° | 55° | 70° | — | — |
| 2006 | 89° | 56° | 72° | — | — |
| 2005 | 85° | 59° | 72° | — | — |
| 2004 | 73° | 60° | 67° | — | — |
| 2003 | 83° | 53° | 68° | — | — |
| 2002 | 78° | 56° | 67° | — | — |
| 2001 | 73° | 60° | 67° | — | — |
| 2000 | 68° | 51° | 60° | 0.03" | — |
| 1999 | 75° | 50° | 63° | — | — |
| 1998 | 92° | 65° | 78° | — | — |
| 1997 | 79° | 60° | 69° | — | — |
| 1996 | 76° | 55° | 65° | — | — |
| 1995 | 91° | 60° | 76° | — | — |
| 1994 | 73° | 51° | 62° | — | — |
| 1993 | 77° | 56° | 66° | — | — |
| 1992 | 81° | 58° | 69° | — | — |
| 1991 | 73° | 54° | 63° | — | — |
| 1990 | 75° | 56° | 65° | — | — |
| 1989 | 68° | 56° | 62° | 0.13" | — |
| 1988 | 97° | 55° | 76° | — | — |
| 1987warmest | 92° | 67° | 79° | — | — |
| 1986 | 79° | 57° | 68° | — | — |
| 1985 | 69° | 58° | 63° | — | — |
| 1984 | 71° | 57° | 64° | 0.13" | — |
| 1983 | 71° | 57° | 64° | 0.1" | — |
| 1982 | 86° | 57° | 72° | — | — |
| 1981 | 75° | 60° | 68° | 0.08" | — |
| 1980 | 73° | 48° | 61° | 0.84" | — |
| 1979 | 71° | 63° | 67° | 0.76" | — |
| 1978 | 78° | 60° | 69° | — | — |
| 1977 | 82° | 52° | 67° | — | — |
| 1976 | 75° | 59° | 67° | — | — |
| 1975coldest | 63° | 52° | 57° | — | — |
| 1974 | 90° | 60° | 75° | — | — |
| 1973 | 76° | 44° | 60° | — | — |
| 1972 | 90° | 61° | 75° | — | — |
| 1971 | 69° | 54° | 61° | 3.86" | — |
55 years of data from PORTLAND KGW-TV