Seattle August 21 Weather Records

Daily averages and all-time records for weather in Seattle, Washington for the date of August 21.
August 21 All-Time Records
1894–2024
Highest temperature 91 °F 2018
Lowest temperature 46 °F 1973
Lowest daily high 56 °F 1899
Highest daily low 65 °F 2018
Most precipitation 1.33 inches 1923
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 76.1 °F
Average low 56.4 °F
Chance precipitation 16.8%
Chance snow 0%
Seattle August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 75 53 0.00 0.0
2022 81 62 0.00 0.0
2021 70 55 0.00 0.0
2020 71 60 0.11 0.0
2019 70 59 0.30 0.0
2018 91 65 0.00 0.0
2017 83 57 0.00 0.0
2016 73 57 0.00 0.0
2015 72 58 0.00 0.0
2014 70 52 0.00 0.0
2013 82 59 0.00 0.0
2012 74 56 0.00 0.0
2011 87 59 0.00 0.0
2010 71 52 0.01 0.0
2009 69 58 0.00 0.0
2008 68 56 0.02 n/a
2007 72 60 0.06 n/a
2006 79 54 0.00 n/a
2005 76 55 0.00 n/a
2004 72 60 0.20 n/a
2003 84 58 0.00 n/a
2002 69 54 0.00 n/a
2001 64 55 0.59 n/a
2000 75 54 0.00 n/a
1999 75 59 0.00 n/a
1998 74 57 0.00 n/a
1997 76 60 0.00 n/a
1996 77 51 0.00 0.0
1995 73 55 0.00 0.0
1994 72 60 0.00 0.0
1993 69 56 0.01 0.0
1992 72 52 0.00 0.0
1991 86 58 0.00 0.0
1990 65 60 0.12 0.0
1989 74 59 0.70 0.0
1988 77 51 0.00 0.0
1987 75 51 0.00 0.0
1986 87 57 0.00 0.0
1985 70 51 0.00 0.0
1984 81 55 0.00 0.0
1983 77 53 0.00 0.0
1982 80 55 0.00 0.0
1981 74 55 0.00 0.0
1980 70 50 0.00 0.0
1979 66 58 0.26 0.0
1978 75 57 0.00 0.0
1977 65 59 0.00 0.0
1976 74 56 0.00 0.0
1975 70 55 0.00 0.0
1974 70 51 0.00 0.0
1973 72 46 0.00 0.0
1972 70 56 0.29 0.0
1971 74 58 0.36 0.0
1970 80 53 0.00 0.0
1969 75 59 0.00 0.0
1968 71 52 0.00 0.0
1967 79 65 0.00 0.0
1966 88 53 0.00 0.0
1965 75 60 0.00 0.0
1964 75 54 0.00 0.0
1963 72 56 0.00 0.0
1962 66 51 0.00 0.0
1961 83 56 0.00 0.0
1960 59 48 0.43 0.0
1959 68 58 0.00 0.0
1958 87 57 0.00 0.0
1957 75 48 0.00 0.0
1956 83 53 0.00 0.0
1955 75 47 0.00 0.0
1954 70 54 0.00 0.0
1953 73 53 0.00 0.0
1952 75 47 0.00 0.0
1951 85 51 0.00 0.0
1950 85 55 0.00 0.0
1949 73 55 0.00 0.0
1948 65 55 0.11 0.0
1947 70 49 0.00 0.0
1946 83 56 0.00 0.0
1945 84 54 0.00 0.0
1944 79 52 0.00 0.0
1943 69 55 0.05 0.0
1942 81 61 0.00 0.0
1941 72 58 0.00 0.0
1940 69 59 0.00 0.0
1939 87 56 0.00 0.0
1938 67 55 0.00 0.0
1937 76 58 0.02 0.0
1936 74 59 0.00 0.0
1935 76 54 0.00 0.0
1934 82 61 0.00 0.0
1933 76 53 0.00 0.0
1932 67 54 0.17 0.0
1931 70 55 0.00 0.0
1930 74 53 0.00 0.0
1929 68 55 0.00 0.0
1928 64 52 0.00 0.0
1927 70 58 0.00 0.0
1926 69 55 0.00 0.0
1925 65 56 0.00 0.0
1924 69 55 0.00 0.0
1923 72 57 1.33 0.0
1922 66 54 0.00 0.0
1921 64 53 0.00 0.0
1920 83 56 0.00 0.0
1919 70 52 0.00 0.0
1918 62 55 0.05 0.0
1917 71 57 0.00 0.0
1916 76 52 0.00 0.0
1915 89 62 0.00 0.0
1914 62 56 0.00 0.0
1913 86 56 0.00 0.0
1912 82 59 0.00 0.0
1911 72 51 0.00 0.0
1910 62 55 0.00 0.0
1909 69 51 0.00 0.0
1908 66 56 0.00 0.0
1907 76 55 0.00 0.0
1906 73 54 0.00 0.0
1905 68 55 0.00 0.0
1904 69 51 0.00 0.0
1903 74 57 0.00 0.0
1902 69 55 0.00 0.0
1901 76 52 0.00 0.0
1900 68 59 0.00 0.0
1899 56 50 0.28 0.0
1898 65 57 0.00 0.0
1897 83 59 0.00 0.0
1896 79 53 0.00 0.0
1895 66 54 0.20 0.0
1894 82 59 0.00 0.0
What's the all-time high for Seattle on 8/21?
For the date of Aug 21, the highest temperature ever reached in Seattle history is 91 °F which happened in 2018.
Highest Temperatures in Seattle on August 21
Rank Temperature Year
1 91 °F 2018
2 89 °F 1915
3 88 °F 1966
4 87 °F 1939
4 87 °F 2011
4 87 °F 1986
4 87 °F 1958
8 86 °F 1991
8 86 °F 1913
10 85 °F 1951
10 85 °F 1950
What's the all-time low for Seattle on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Seattle history is 46 °F which happened in 1973.
Lowest Temperatures in Seattle on August 21
Rank Temperature Year
1 46 °F 1973
2 47 °F 1952
2 47 °F 1955
4 48 °F 1957
4 48 °F 1960
6 49 °F 1947
7 50 °F 1980
7 50 °F 1899
9 51 °F 1985
9 51 °F 1951
9 51 °F 1909
9 51 °F 1904
9 51 °F 1962
9 51 °F 1974
9 51 °F 1911
9 51 °F 1988
9 51 °F 1996
9 51 °F 1987
Lowest High Temperatures in Seattle on August 21
Rank Temperature Year
1 56 °F 1899
2 59 °F 1960
3 62 °F 1918
3 62 °F 1914
3 62 °F 1910
6 64 °F 1928
6 64 °F 2001
6 64 °F 1921
9 65 °F 1925
9 65 °F 1948
9 65 °F 1898
9 65 °F 1977
9 65 °F 1990
What's the most it has ever rained in Seattle on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Seattle history is 1.33 inches which happened in 1923.
All-Time Most Precipitation in Seattle on August 21
Rank Precipitation Year
1 1.33 inches 1923
2 0.70 inches 1989
3 0.59 inches 2001
4 0.43 inches 1960
5 0.36 inches 1971
6 0.30 inches 2019
7 0.29 inches 1972
8 0.28 inches 1899
9 0.26 inches 1979
10 0.20 inches 2004
10 0.20 inches 1895
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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