Weather on September 20
Portland, OR
55 Years of Data
Avg High
73°F
Avg Low
53°F
Warmest
1974
77°F avg
Coldest
1982
54°F avg
About This Date
September 20th in Portland, OR typically brings pleasant fall weather, with average highs around 73°F and lows near 53°F. Over 55 years of records, the warmest September 20th was in 1974 (77°F average), while the coldest was 1982 (54°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 24% of September 20th dates historically, with the wettest September 20th recording 3.66" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for September 20th in Portland, OR? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 55° | 68° | — | — |
| 2024 | 70° | 52° | 61° | — | — |
| 2023 | 66° | 54° | 60° | — | — |
| 2022 | 85° | 57° | 71° | — | — |
| 2021 | 70° | 51° | 60° | — | — |
| 2020 | 74° | 55° | 64° | — | — |
| 2019 | 65° | 57° | 61° | — | — |
| 2018 | 71° | 50° | 61° | — | — |
| 2017 | 60° | 49° | 54° | 3.66" | — |
| 2016 | 70° | 50° | 60° | — | — |
| 2015 | 78° | 57° | 68° | — | — |
| 2014 | 92° | 59° | 75° | — | — |
| 2013 | 72° | 53° | 62° | — | — |
| 2012 | 62° | 60° | 61° | — | — |
| 2011 | 81° | 53° | 67° | — | — |
| 2010 | 65° | 55° | 60° | — | — |
| 2009 | 71° | 49° | 60° | 0.03" | — |
| 2008 | 65° | 57° | 61° | — | — |
| 2007 | 68° | 49° | 58° | — | — |
| 2006 | 60° | 48° | 54° | 0.81" | — |
| 2005 | 70° | 53° | 61° | — | — |
| 2004 | 65° | 49° | 57° | — | — |
| 2003 | 72° | 49° | 60° | — | — |
| 2002 | 73° | 50° | 62° | — | — |
| 2001 | 77° | 51° | 64° | — | — |
| 2000 | 75° | 58° | 66° | — | — |
| 1999 | 88° | 60° | 74° | — | — |
| 1998 | 71° | 53° | 62° | — | — |
| 1997 | 80° | 53° | 67° | — | — |
| 1996 | 66° | 48° | 57° | — | — |
| 1995 | 82° | 60° | 71° | — | — |
| 1994 | 82° | 61° | 71° | — | — |
| 1993 | 62° | 49° | 55° | — | — |
| 1992 | 75° | 55° | 65° | — | — |
| 1991 | 70° | 49° | 59° | — | — |
| 1990 | 82° | 55° | 69° | — | — |
| 1989 | 82° | 46° | 64° | — | — |
| 1988 | 66° | 49° | 57° | 0.05" | — |
| 1987 | 86° | 54° | 70° | — | — |
| 1986 | 65° | 52° | 58° | 0.53" | — |
| 1985 | 72° | 49° | 60° | — | — |
| 1984 | 68° | 54° | 61° | 0.03" | — |
| 1983 | 72° | 48° | 60° | — | — |
| 1982coldest | 56° | 53° | 54° | 3.66" | — |
| 1981 | 62° | 52° | 57° | 0.2" | — |
| 1980 | 65° | 52° | 58° | 0.41" | — |
| 1979 | 77° | 58° | 67° | — | — |
| 1978 | 68° | 48° | 58° | 0.05" | — |
| 1977 | 66° | 54° | 60° | 0.51" | — |
| 1976 | 88° | 61° | 74° | — | — |
| 1975 | 84° | 53° | 69° | — | — |
| 1974warmest | 93° | 61° | 77° | — | — |
| 1973 | 65° | 56° | 60° | 1.75" | — |
| 1972 | 65° | 53° | 59° | 0.71" | — |
| 1971 | 75° | 55° | 65° | — | — |
55 years of data from PORTLAND KGW-TV