Weather on September 21
Portland, OR
55 Years of Data
Avg High
74°F
Avg Low
54°F
Warmest
1974
76°F avg
Coldest
1996
55°F avg
About This Date
September 21st in Portland, OR typically brings pleasant fall weather, with average highs around 74°F and lows near 54°F. Over 55 years of records, the warmest September 21st was in 1974 (76°F average), while the coldest was 1996 (55°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 25% of September 21st dates historically, with the wettest September 21st recording 2.82" of rain. The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
Planning for September 21st in Portland, OR? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 55° | 63° | 0.58" | — |
| 2024 | 75° | 51° | 63° | — | — |
| 2023 | 74° | 49° | 61° | — | — |
| 2022 | 78° | 56° | 67° | — | — |
| 2021 | 84° | 51° | 68° | — | — |
| 2020 | 73° | 59° | 66° | — | — |
| 2019 | 69° | 54° | 61° | 0.03" | — |
| 2018 | 74° | 51° | 62° | — | — |
| 2017 | 63° | 47° | 55° | 0.03" | — |
| 2016 | 72° | 50° | 61° | — | — |
| 2015 | 67° | 55° | 61° | 0.03" | — |
| 2014 | 86° | 63° | 74° | — | — |
| 2013 | 65° | 56° | 60° | 0.25" | — |
| 2012 | 63° | 55° | 59° | — | — |
| 2011 | 84° | 59° | 72° | — | — |
| 2010 | 69° | 52° | 60° | — | — |
| 2009 | 83° | 54° | 68° | — | — |
| 2008 | 64° | 54° | 59° | 0.51" | — |
| 2007 | 74° | 53° | 63° | — | — |
| 2006 | 62° | 54° | 58° | 0.03" | — |
| 2005 | 73° | 49° | 61° | — | — |
| 2004 | 68° | 48° | 58° | — | — |
| 2003 | 75° | 52° | 63° | — | — |
| 2002 | 78° | 51° | 65° | — | — |
| 2001 | 74° | 52° | 63° | — | — |
| 2000 | 71° | 59° | 65° | — | — |
| 1999 | 88° | 58° | 73° | — | — |
| 1998 | 79° | 54° | 66° | — | — |
| 1997 | 85° | 54° | 69° | — | — |
| 1996coldest | 64° | 46° | 55° | 0.38" | — |
| 1995 | 78° | 65° | 71° | — | — |
| 1994 | 90° | 62° | 76° | — | — |
| 1993 | 70° | 45° | 57° | — | — |
| 1992 | 82° | 61° | 71° | — | — |
| 1991 | 72° | 47° | 59° | — | — |
| 1990 | 89° | 57° | 73° | — | — |
| 1989 | 86° | 46° | 66° | — | — |
| 1988 | 71° | 49° | 60° | — | — |
| 1987 | 88° | 56° | 72° | — | — |
| 1986 | 68° | 53° | 61° | 0.05" | — |
| 1985 | 72° | 49° | 60° | — | — |
| 1984 | 68° | 52° | 60° | — | — |
| 1983 | 78° | 57° | 68° | — | — |
| 1982 | 74° | 52° | 63° | — | — |
| 1981 | 64° | 49° | 56° | 2.06" | — |
| 1980 | 65° | 50° | 57° | 0.03" | — |
| 1979 | 72° | 58° | 65° | — | — |
| 1978 | 68° | 54° | 61° | — | — |
| 1977 | 64° | 52° | 58° | 0.25" | — |
| 1976 | 67° | 59° | 63° | — | — |
| 1975 | 85° | 61° | 73° | — | — |
| 1974warmest | 92° | 61° | 76° | — | — |
| 1973 | 68° | 56° | 62° | 0.41" | — |
| 1972 | 64° | 53° | 59° | 2.82" | — |
| 1971 | 79° | 50° | 64° | — | — |
55 years of data from PORTLAND KGW-TV