Weather on August 20
Seattle, WA
55 Years of Data
Avg High
75°F
Avg Low
58°F
Warmest
2016
76°F avg
Coldest
1973
60°F avg
About This Date
August 20th in Seattle, WA typically brings pleasant summer weather, with average highs around 75°F and lows near 58°F. Over 54 years of records, the warmest August 20th was in 2016 (76°F average), while the coldest was 1973 (60°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 20% of August 20th dates historically, with the wettest August 20th recording 1.02" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Seattle, WA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 61° | 68° | — | — |
| 2024 | 70° | 61° | 65° | 0.15" | — |
| 2023 | 77° | 58° | 67° | — | — |
| 2022 | 78° | 63° | 70° | — | — |
| 2021 | 66° | 58° | 62° | — | — |
| 2020 | 80° | 64° | 72° | 0.05" | — |
| 2019 | 83° | 57° | 70° | — | — |
| 2018 | 81° | 59° | 70° | — | — |
| 2017 | 76° | 57° | 66° | — | — |
| 2016warmest | 91° | 60° | 76° | — | — |
| 2015 | 75° | 61° | 68° | — | — |
| 2014 | 73° | 60° | 67° | — | — |
| 2013 | 77° | 62° | 70° | — | — |
| 2012 | 77° | 60° | 69° | — | — |
| 2011 | 82° | 57° | 70° | — | — |
| 2010 | 70° | 55° | 62° | — | — |
| 2009 | 82° | 62° | 72° | — | — |
| 2008 | 69° | 58° | 63° | 1.02" | — |
| 2007 | 67° | 58° | 62° | 0.86" | — |
| 2006 | 83° | 55° | 69° | — | — |
| 2005 | 80° | 56° | 68° | — | — |
| 2004 | 80° | 60° | 70° | — | — |
| 2003 | 79° | 54° | 66° | — | — |
| 2002 | 69° | 56° | 62° | 0.03" | — |
| 2001 | 74° | 56° | 65° | — | — |
| 2000 | 69° | 54° | 61° | — | — |
| 1999 | 78° | 57° | 68° | — | — |
| 1997 | 67° | 59° | 63° | 0.28" | — |
| 1996 | 71° | 55° | 63° | 0.51" | — |
| 1995 | 78° | 52° | 65° | — | — |
| 1994 | 75° | 59° | 67° | — | — |
| 1993 | 74° | 59° | 66° | — | — |
| 1992 | 76° | 55° | 65° | — | — |
| 1991 | 84° | 59° | 72° | — | — |
| 1990 | 77° | 59° | 68° | — | — |
| 1989 | 72° | 61° | 66° | 0.13" | — |
| 1988 | 67° | 53° | 60° | — | — |
| 1987 | 67° | 54° | 60° | — | — |
| 1986 | 81° | 58° | 69° | — | — |
| 1985 | 70° | 57° | 63° | — | — |
| 1984 | 75° | 53° | 64° | — | — |
| 1983 | 74° | 55° | 64° | — | — |
| 1982 | 81° | 61° | 71° | 0.05" | — |
| 1981 | 70° | 62° | 66° | — | — |
| 1980 | 69° | 55° | 62° | — | — |
| 1979 | 73° | 58° | 65° | 0.03" | — |
| 1978 | 66° | 57° | 62° | — | — |
| 1977 | 77° | 59° | 68° | — | — |
| 1976 | 70° | 56° | 63° | 0.05" | — |
| 1975 | 71° | 57° | 64° | — | — |
| 1974 | 68° | 58° | 63° | — | — |
| 1973coldest | 69° | 52° | 60° | — | — |
| 1972 | 72° | 57° | 64° | — | — |
| 1971 | 76° | 64° | 70° | — | — |
54 years of data from SEATTLE URBAN SITE