Weather on August 18
Seattle, WA
55 Years of Data
Avg High
76°F
Avg Low
58°F
Warmest
2022
79°F avg
Coldest
1973
58°F avg
About This Date
August 18th in Seattle, WA typically brings pleasant summer weather, with average highs around 76°F and lows near 58°F. Over 54 years of records, the warmest August 18th was in 2022 (79°F average), while the coldest was 1973 (58°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 19% of August 18th dates historically, with the wettest August 18th recording 3.18" of rain. The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Seattle, WA? Great weather for outdoor activities.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 61° | 68° | — | — |
| 2024 | 81° | 61° | 71° | 0.03" | — |
| 2023 | 74° | 58° | 66° | — | — |
| 2022warmest | 89° | 70° | 79° | — | — |
| 2021 | 77° | 54° | 65° | — | — |
| 2020 | 81° | 62° | 71° | — | — |
| 2019 | 77° | 60° | 69° | — | — |
| 2018 | 79° | 56° | 67° | — | — |
| 2017 | 74° | 58° | 66° | — | — |
| 2016 | 86° | 62° | 74° | — | — |
| 2015 | 84° | 63° | 73° | — | — |
| 2014 | 85° | 63° | 74° | — | — |
| 2013 | 80° | 61° | 70° | — | — |
| 2012 | 72° | 59° | 65° | — | — |
| 2011 | 73° | 55° | 64° | — | — |
| 2010 | 72° | 59° | 65° | — | — |
| 2009 | 83° | 60° | 71° | — | — |
| 2008 | 65° | 61° | 63° | 0.08" | — |
| 2007 | 73° | 57° | 65° | 0.28" | — |
| 2006 | 79° | 56° | 67° | — | — |
| 2005 | 77° | 59° | 68° | — | — |
| 2004 | 80° | 61° | 70° | — | — |
| 2003 | 82° | 62° | 72° | — | — |
| 2002 | 77° | 51° | 64° | — | — |
| 2001 | 72° | 58° | 65° | — | — |
| 2000 | 66° | 55° | 61° | 0.69" | — |
| 1999 | 75° | 57° | 66° | — | — |
| 1997 | 74° | 61° | 67° | — | — |
| 1996 | 72° | 55° | 63° | — | — |
| 1995 | 71° | 54° | 62° | — | — |
| 1994 | 80° | 57° | 69° | — | — |
| 1993 | 79° | 56° | 67° | — | — |
| 1992 | 80° | 60° | 70° | — | — |
| 1991 | 83° | 59° | 71° | — | — |
| 1990 | 71° | 59° | 65° | — | — |
| 1989 | 77° | 56° | 66° | — | — |
| 1988 | 72° | 57° | 64° | 0.05" | — |
| 1987 | 76° | 52° | 64° | — | — |
| 1986 | 78° | 57° | 68° | — | — |
| 1985 | 73° | 56° | 64° | — | — |
| 1984 | 72° | 59° | 65° | 0.05" | — |
| 1983 | 78° | 58° | 68° | — | — |
| 1982 | 75° | 52° | 63° | — | — |
| 1981 | 84° | 59° | 72° | — | — |
| 1980 | 70° | 54° | 62° | 0.15" | — |
| 1979 | 66° | 60° | 63° | 0.18" | — |
| 1978 | 66° | 57° | 62° | 0.3" | — |
| 1977 | 75° | 60° | 68° | — | — |
| 1976 | 70° | 53° | 61° | — | — |
| 1975 | 65° | 59° | 62° | 3.18" | — |
| 1974 | 66° | 58° | 62° | — | — |
| 1973coldest | 68° | 48° | 58° | — | — |
| 1972 | 73° | 56° | 64° | — | — |
| 1971 | 78° | 56° | 67° | — | — |
54 years of data from SEATTLE URBAN SITE