Weather on August 20
Portland, OR
55 Years of Data
Avg High
79°F
Avg Low
58°F
Warmest
2016
82°F avg
Coldest
1988
60°F avg
About This Date
August 20th in Portland, OR typically brings pleasant summer weather, with average highs around 79°F and lows near 58°F. Over 55 years of records, the warmest August 20th was in 2016 (82°F average), while the coldest was 1988 (60°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 16% of August 20th dates historically, with the wettest August 20th recording 1.96" of rain. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Portland, OR? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 60° | 70° | — | — |
| 2024 | 78° | 57° | 68° | — | — |
| 2023 | 85° | 64° | 74° | — | — |
| 2022 | 79° | 63° | 71° | — | — |
| 2021 | 71° | 58° | 64° | — | — |
| 2020 | 81° | 67° | 74° | 0.03" | — |
| 2019 | 83° | 56° | 69° | — | — |
| 2018 | 80° | 59° | 70° | — | — |
| 2017 | 78° | 56° | 67° | — | — |
| 2016warmest | 98° | 66° | 82° | — | — |
| 2015 | 79° | 61° | 70° | — | — |
| 2014 | 76° | 59° | 67° | — | — |
| 2013 | 80° | 54° | 67° | — | — |
| 2012 | 77° | 56° | 66° | — | — |
| 2011 | 92° | 61° | 76° | — | — |
| 2010 | 73° | 49° | 61° | — | — |
| 2009 | 87° | 62° | 75° | — | — |
| 2008 | 68° | 60° | 64° | 0.58" | — |
| 2007 | 67° | 62° | 64° | 0.36" | — |
| 2006 | 91° | 58° | 74° | — | — |
| 2005 | 87° | 58° | 72° | — | — |
| 2004 | 88° | 61° | 74° | — | — |
| 2003 | 85° | 75° | 80° | — | — |
| 2002 | 72° | 57° | 64° | — | — |
| 2001 | 76° | 53° | 64° | — | — |
| 2000 | 75° | 50° | 63° | — | — |
| 1999 | 81° | 59° | 70° | — | — |
| 1998 | 83° | 58° | 70° | — | — |
| 1997 | 73° | 61° | 67° | 1.96" | — |
| 1996 | 73° | 59° | 66° | — | — |
| 1995 | 89° | 58° | 73° | — | — |
| 1994 | 76° | 60° | 68° | — | — |
| 1993 | 73° | 61° | 67° | 0.13" | — |
| 1992 | 82° | 53° | 68° | — | — |
| 1991 | 89° | 58° | 73° | — | — |
| 1990 | 83° | 62° | 72° | — | — |
| 1989 | 72° | 61° | 66° | — | — |
| 1988coldest | 72° | 49° | 60° | — | — |
| 1987 | 74° | 53° | 63° | — | — |
| 1986 | 92° | 60° | 76° | — | — |
| 1985 | 69° | 53° | 61° | — | — |
| 1984 | 84° | 55° | 70° | — | — |
| 1983 | 76° | 54° | 65° | — | — |
| 1982 | 91° | 69° | 80° | — | — |
| 1981 | 71° | 59° | 65° | — | — |
| 1980 | 77° | 50° | 64° | — | — |
| 1979 | 78° | 59° | 69° | 0.25" | — |
| 1978 | 66° | 56° | 61° | 1.32" | — |
| 1977 | 70° | 60° | 65° | — | — |
| 1976 | 73° | 58° | 65° | 0.05" | — |
| 1975 | 73° | 54° | 63° | — | — |
| 1974 | 71° | 55° | 63° | — | — |
| 1973 | 75° | 48° | 62° | — | — |
| 1972 | 78° | 60° | 69° | — | — |
| 1971 | 80° | 63° | 71° | 0.05" | — |
55 years of data from PORTLAND KGW-TV