Seattle August 18 Weather Records

Daily averages and all-time records for weather in Seattle, Washington for the date of August 18.
August 18 All-Time Records
1894–2024
Highest temperature 89 °F 1940
Lowest temperature 47 °F 1951
Lowest daily high 62 °F 1929
Highest daily low 68 °F 2022
Most precipitation 1.63 inches 1975
Most snow none -
August 18 Average Weather
1991–2020 1
Average high 76.5 °F
Average low 56.7 °F
Chance precipitation 16.0%
Chance snow 0%
Seattle August 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 75 57 0.00 0.0
2022 87 68 0.00 0.0
2021 77 53 0.00 0.0
2020 81 61 0.00 0.0
2019 76 59 0.00 0.0
2018 81 55 0.00 0.0
2017 73 55 0.00 0.0
2016 87 60 0.00 0.0
2015 86 59 0.00 0.0
2014 85 60 0.00 0.0
2013 79 60 0.00 0.0
2012 71 58 0.00 0.0
2011 73 54 0.00 0.0
2010 70 57 0.00 0.0
2009 84 59 0.00 0.0
2008 64 60 0.17 n/a
2007 74 55 0.20 n/a
2006 81 53 0.00 n/a
2005 78 56 0.00 n/a
2004 80 57 0.00 n/a
2003 81 59 0.00 n/a
2002 74 51 0.00 n/a
2001 71 55 0.00 n/a
2000 65 54 0.28 n/a
1999 72 55 0.00 n/a
1998 68 56 0.00 n/a
1997 73 57 0.00 n/a
1996 70 52 0.00 0.0
1995 70 50 0.00 0.0
1994 79 57 0.00 0.0
1993 79 56 0.00 0.0
1992 77 57 0.00 0.0
1991 88 57 0.00 0.0
1990 73 59 0.08 0.0
1989 82 56 0.00 0.0
1988 73 55 0.00 0.0
1987 79 53 0.00 0.0
1986 78 52 0.00 0.0
1985 73 53 0.00 0.0
1984 74 57 0.01 0.0
1983 78 56 0.00 0.0
1982 75 54 0.00 0.0
1981 87 55 0.00 0.0
1980 69 53 0.02 0.0
1979 64 58 0.24 0.0
1978 69 57 0.10 0.0
1977 76 58 0.00 0.0
1976 73 53 0.00 0.0
1975 66 57 1.63 0.0
1974 67 55 0.01 0.0
1973 69 50 0.00 0.0
1972 77 53 0.00 0.0
1971 78 54 0.00 0.0
1970 77 55 0.00 0.0
1969 74 57 0.02 0.0
1968 66 54 0.14 0.0
1967 86 55 0.00 0.0
1966 76 53 0.00 0.0
1965 86 61 0.00 0.0
1964 65 52 0.20 0.0
1963 72 52 0.10 0.0
1962 66 56 0.04 0.0
1961 83 57 0.00 0.0
1960 76 58 0.00 0.0
1959 68 52 0.00 0.0
1958 78 53 0.00 0.0
1957 69 54 0.00 0.0
1956 87 54 0.00 0.0
1955 77 53 0.00 0.0
1954 68 50 0.37 0.0
1953 82 54 0.00 0.0
1952 63 53 0.00 0.0
1951 79 47 0.00 0.0
1950 81 53 0.00 0.0
1949 77 52 0.00 0.0
1948 73 55 0.00 0.0
1947 72 53 0.01 0.0
1946 86 56 0.00 0.0
1945 71 55 0.00 0.0
1944 68 54 0.01 0.0
1943 71 52 0.00 0.0
1942 84 58 0.00 0.0
1941 82 59 0.00 0.0
1940 89 60 0.00 0.0
1939 78 54 0.00 0.0
1938 63 56 0.00 0.0
1937 79 57 0.00 0.0
1936 72 59 0.00 0.0
1935 70 54 0.22 0.0
1934 75 58 0.00 0.0
1933 71 56 0.00 0.0
1932 73 56 0.00 0.0
1931 67 57 0.01 0.0
1930 76 55 0.00 0.0
1929 62 54 0.24 0.0
1928 65 51 0.00 0.0
1927 79 57 0.00 0.0
1926 72 60 0.01 0.0
1925 78 57 0.00 0.0
1924 64 56 0.40 0.0
1923 77 57 0.00 0.0
1922 64 59 0.00 0.0
1921 72 58 0.02 0.0
1920 67 50 0.00 0.0
1919 69 53 0.00 0.0
1918 65 52 0.27 0.0
1917 71 58 0.00 0.0
1916 65 50 0.06 0.0
1915 77 57 0.00 0.0
1914 74 53 0.00 0.0
1913 65 50 0.00 0.0
1912 64 55 0.00 0.0
1911 76 53 0.00 0.0
1910 81 57 0.00 0.0
1909 78 55 0.00 0.0
1908 88 60 0.00 0.0
1907 69 54 0.00 0.0
1906 72 50 0.00 0.0
1905 73 56 0.00 0.0
1904 76 55 0.00 0.0
1903 84 58 0.00 0.0
1902 72 51 0.00 0.0
1901 76 53 0.00 0.0
1900 68 56 0.05 0.0
1899 68 58 0.00 0.0
1898 62 57 0.01 0.0
1897 84 57 0.00 0.0
1896 69 55 0.00 0.0
1895 62 47 0.00 0.0
1894 76 53 0.00 0.0
What's the all-time high for Seattle on 8/18?
For the date of Aug 18, the highest temperature ever reached in Seattle history is 89 °F which happened in 1940.
Highest Temperatures in Seattle on August 18
Rank Temperature Year
1 89 °F 1940
2 88 °F 1908
2 88 °F 1991
4 87 °F 2016
4 87 °F 1981
4 87 °F 1956
4 87 °F 2022
8 86 °F 2015
8 86 °F 1965
8 86 °F 1946
8 86 °F 1967
What's the all-time low for Seattle on 8/18?
For the date of Aug 18, the lowest temperature ever reached in Seattle history is 47 °F which has happened 2 times, most recently in 1951.
Lowest Temperatures in Seattle on August 18
Rank Temperature Year
1 47 °F 1951
1 47 °F 1895
3 50 °F 1913
3 50 °F 1995
3 50 °F 1973
3 50 °F 1954
3 50 °F 1906
3 50 °F 1916
3 50 °F 1920
10 51 °F 1902
10 51 °F 2002
10 51 °F 1928
Lowest High Temperatures in Seattle on August 18
Rank Temperature Year
1 62 °F 1898
1 62 °F 1895
1 62 °F 1929
4 63 °F 1938
4 63 °F 1952
6 64 °F 2008
6 64 °F 1979
6 64 °F 1924
6 64 °F 1922
6 64 °F 1912
What's the most it has ever rained in Seattle on 8/18?
For the date of Aug 18, the most precipitation ever recorded in Seattle history is 1.63 inches which happened in 1975.
All-Time Most Precipitation in Seattle on August 18
Rank Precipitation Year
1 1.63 inches 1975
2 0.40 inches 1924
3 0.37 inches 1954
4 0.28 inches 2000
5 0.27 inches 1918
6 0.24 inches 1979
6 0.24 inches 1929
8 0.22 inches 1935
9 0.20 inches 1964
9 0.20 inches 2007
Weather Station Details
Years Station Coordinates
1948–2024 Seattle Tacoma International Airport location
1894–1947 University of Washington location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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