Weather on August 21
Portland, OR
55 Years of Data
Avg High
78°F
Avg Low
57°F
Warmest
2018
79°F avg
Coldest
1978
60°F avg
About This Date
August 21st in Portland, OR typically brings pleasant summer weather, with average highs around 78°F and lows near 57°F. Over 55 years of records, the warmest August 21st was in 2018 (79°F average), while the coldest was 1978 (60°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 25% of August 21st dates historically, with the wettest August 21st recording 0.94" 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 August 21st in Portland, OR? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 58° | 71° | — | — |
| 2024 | 72° | 60° | 66° | — | — |
| 2023 | 81° | 56° | 68° | — | — |
| 2022 | 87° | 61° | 74° | — | — |
| 2021 | 69° | 57° | 63° | 0.08" | — |
| 2020 | 76° | 57° | 66° | 0.64" | — |
| 2019 | 69° | 59° | 64° | 0.33" | — |
| 2018warmest | 91° | 66° | 79° | — | — |
| 2017 | 86° | 60° | 73° | — | — |
| 2016 | 77° | 57° | 67° | — | — |
| 2015 | 78° | 56° | 67° | — | — |
| 2014 | 79° | 53° | 66° | — | — |
| 2013 | 86° | 60° | 73° | — | — |
| 2012 | 74° | 58° | 66° | — | — |
| 2011 | 90° | 64° | 77° | — | — |
| 2010 | 70° | 50° | 60° | — | — |
| 2009 | 74° | 59° | 66° | — | — |
| 2008 | 73° | 56° | 64° | 0.58" | — |
| 2007 | 78° | 62° | 70° | 0.03" | — |
| 2006 | 79° | 56° | 67° | — | — |
| 2005 | 80° | 58° | 69° | — | — |
| 2004 | 81° | 63° | 72° | 0.94" | — |
| 2003 | 90° | 59° | 74° | — | — |
| 2002 | 66° | 56° | 61° | — | — |
| 2001 | 70° | 56° | 63° | — | — |
| 2000 | 81° | 51° | 66° | — | — |
| 1999 | 77° | 61° | 69° | — | — |
| 1998 | 76° | 62° | 69° | — | — |
| 1997 | 80° | 59° | 70° | — | — |
| 1996 | 80° | 55° | 68° | — | — |
| 1995 | 80° | 58° | 69° | — | — |
| 1994 | 72° | 59° | 65° | 0.05" | — |
| 1993 | 77° | 58° | 67° | — | — |
| 1992 | 70° | 54° | 62° | — | — |
| 1991 | 88° | 61° | 74° | — | — |
| 1990 | 74° | 62° | 68° | 0.58" | — |
| 1989 | 73° | 60° | 67° | 0.08" | — |
| 1988 | 81° | 52° | 66° | — | — |
| 1987 | 78° | 52° | 65° | — | — |
| 1986 | 89° | 56° | 72° | — | — |
| 1985 | 71° | 49° | 60° | — | — |
| 1984 | 86° | 56° | 71° | — | — |
| 1983 | 83° | 54° | 68° | — | — |
| 1982 | 87° | 56° | 71° | — | — |
| 1981 | 79° | 55° | 67° | — | — |
| 1980 | 77° | 52° | 64° | — | — |
| 1979 | 78° | 61° | 69° | 0.23" | — |
| 1978coldest | 67° | 54° | 60° | 0.23" | — |
| 1977 | 69° | 59° | 64° | 0.03" | — |
| 1976 | 80° | 53° | 67° | — | — |
| 1975 | 71° | 57° | 64° | — | — |
| 1974 | 78° | 51° | 65° | — | — |
| 1973 | 77° | 49° | 63° | — | — |
| 1972 | 79° | 62° | 70° | 0.28" | — |
| 1971 | 77° | 61° | 69° | 0.74" | — |
55 years of data from PORTLAND KGW-TV