Seattle September 21 Weather Records

Daily averages and all-time records for weather in Seattle, Washington for the date of September 21.
September 21 All-Time Records
1894–2024
Highest temperature 88 °F 1974
Lowest temperature 36 °F 1895
Lowest daily high 55 °F 1945
Highest daily low 60 °F 2011
Most precipitation 1.04 inches 1903
Most snow none -
September 21 Average Weather
1991–2020 1
Average high 68.9 °F
Average low 52.0 °F
Chance precipitation 30.2%
Chance snow 0%
Seattle September 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 70 48 0.00 0.0
2022 77 50 0.00 0.0
2021 75 49 0.00 0.0
2020 70 54 0.00 0.0
2019 67 57 0.00 0.0
2018 72 59 0.02 0.0
2017 64 50 0.02 0.0
2016 68 52 0.00 0.0
2015 65 49 0.00 0.0
2014 79 55 0.00 0.0
2013 70 56 0.00 0.0
2012 61 55 0.00 0.0
2011 76 60 0.00 0.0
2010 65 50 0.00 0.0
2009 76 49 0.00 0.0
2008 64 54 0.02 n/a
2007 66 51 0.01 n/a
2006 60 47 0.17 n/a
2005 66 48 0.00 n/a
2004 64 47 0.00 n/a
2003 69 49 0.00 n/a
2002 71 47 0.00 n/a
2001 64 53 0.05 n/a
2000 67 56 0.00 n/a
1999 78 55 0.00 n/a
1998 72 50 0.00 n/a
1997 73 48 0.00 n/a
1996 60 48 0.10 0.0
1995 84 60 0.00 0.0
1994 81 59 0.00 0.0
1993 65 43 0.00 0.0
1992 74 59 0.00 0.0
1991 68 45 0.00 0.0
1990 81 55 0.00 0.0
1989 80 53 0.00 0.0
1988 67 46 0.00 0.0
1987 83 54 0.00 0.0
1986 63 50 0.00 0.0
1985 64 52 0.00 0.0
1984 61 49 0.00 0.0
1983 75 51 0.00 0.0
1982 69 53 0.00 0.0
1981 60 48 0.94 0.0
1980 63 51 0.17 0.0
1979 70 56 0.00 0.0
1978 62 52 0.18 0.0
1977 63 49 0.00 0.0
1976 65 58 0.00 0.0
1975 86 54 0.00 0.0
1974 88 54 0.00 0.0
1973 65 54 0.02 0.0
1972 57 47 0.72 0.0
1971 72 45 0.00 0.0
1970 60 48 0.00 0.0
1969 65 53 0.13 0.0
1968 59 46 0.00 0.0
1967 78 56 0.00 0.0
1966 78 53 0.00 0.0
1965 65 51 0.00 0.0
1964 60 50 0.00 0.0
1963 71 56 0.00 0.0
1962 62 56 0.00 0.0
1961 62 45 0.07 0.0
1960 64 39 0.00 0.0
1959 63 52 0.06 0.0
1958 62 46 0.00 0.0
1957 72 47 0.00 0.0
1956 65 48 0.00 0.0
1955 60 39 0.00 0.0
1954 68 51 0.00 0.0
1953 76 43 0.00 0.0
1952 88 50 0.00 0.0
1951 75 43 0.00 0.0
1950 86 51 0.00 0.0
1949 68 46 0.00 0.0
1948 61 49 0.34 0.0
1947 76 54 0.00 0.0
1946 65 53 0.00 0.0
1945 55 49 0.04 0.0
1944 66 57 0.00 0.0
1943 70 55 0.00 0.0
1942 77 54 0.00 0.0
1941 66 45 0.00 0.0
1940 76 55 0.00 0.0
1939 80 57 0.00 0.0
1938 70 54 0.00 0.0
1937 63 53 0.00 0.0
1936 73 51 0.02 0.0
1935 72 53 0.00 0.0
1934 60 51 0.23 0.0
1933 57 52 0.16 0.0
1932 65 46 0.00 0.0
1931 63 48 0.00 0.0
1930 61 51 0.00 0.0
1929 58 47 0.01 0.0
1928 69 51 0.00 0.0
1927 62 56 0.02 0.0
1926 58 52 0.17 0.0
1925 68 47 0.00 0.0
1924 64 54 0.00 0.0
1923 60 50 0.00 0.0
1922 64 52 0.08 0.0
1921 63 52 0.00 0.0
1920 58 51 0.23 0.0
1919 67 49 0.00 0.0
1918 59 47 0.00 0.0
1917 58 48 0.00 0.0
1916 77 49 0.00 0.0
1915 64 52 0.00 0.0
1914 65 47 0.00 0.0
1913 61 51 0.26 0.0
1912 73 50 0.00 0.0
1911 62 49 0.01 0.0
1910 59 56 0.00 0.0
1909 61 50 0.00 0.0
1908 61 48 0.00 0.0
1907 70 50 0.00 0.0
1906 65 50 0.00 0.0
1905 71 58 0.00 0.0
1904 58 51 0.00 0.0
1903 60 50 1.04 0.0
1902 69 45 0.00 0.0
1901 61 53 0.45 0.0
1900 63 56 0.00 0.0
1899 63 53 0.00 0.0
1898 67 57 0.36 0.0
1897 57 52 0.00 0.0
1896 62 50 0.00 0.0
1895 58 36 0.00 0.0
1894 63 54 0.06 0.0
What's the all-time high for Seattle on 9/21?
For the date of Sep 21, the highest temperature ever reached in Seattle history is 88 °F which has happened 2 times, most recently in 1974.
Highest Temperatures in Seattle on September 21
Rank Temperature Year
1 88 °F 1952
1 88 °F 1974
3 86 °F 1975
3 86 °F 1950
5 84 °F 1995
6 83 °F 1987
7 81 °F 1990
7 81 °F 1994
9 80 °F 1989
9 80 °F 1939
What's the all-time low for Seattle on 9/21?
For the date of Sep 21, the lowest temperature ever reached in Seattle history is 36 °F which happened in 1895.
Lowest Temperatures in Seattle on September 21
Rank Temperature Year
1 36 °F 1895
2 39 °F 1955
2 39 °F 1960
4 43 °F 1993
4 43 °F 1951
4 43 °F 1953
7 45 °F 1902
7 45 °F 1961
7 45 °F 1941
7 45 °F 1991
7 45 °F 1971
Lowest High Temperatures in Seattle on September 21
Rank Temperature Year
1 55 °F 1945
2 57 °F 1972
2 57 °F 1897
2 57 °F 1933
5 58 °F 1895
5 58 °F 1926
5 58 °F 1904
5 58 °F 1917
5 58 °F 1929
5 58 °F 1920
What's the most it has ever rained in Seattle on 9/21?
For the date of Sep 21, the most precipitation ever recorded in Seattle history is 1.04 inches which happened in 1903.
All-Time Most Precipitation in Seattle on September 21
Rank Precipitation Year
1 1.04 inches 1903
2 0.94 inches 1981
3 0.72 inches 1972
4 0.45 inches 1901
5 0.36 inches 1898
6 0.34 inches 1948
7 0.26 inches 1913
8 0.23 inches 1920
8 0.23 inches 1934
10 0.18 inches 1978
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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