Seattle September 20 Weather Records

Daily averages and all-time records for weather in Seattle, Washington for the date of September 20.
September 20 All-Time Records
1894–2024
Highest temperature 88 °F 1974
Lowest temperature 40 °F 1949
Lowest daily high 55 °F 2006
Highest daily low 61 °F 1967
Most precipitation 1.10 inches 1923
Most snow none -
September 20 Average Weather
1991–2020 1
Average high 69.2 °F
Average low 52.3 °F
Chance precipitation 30.1%
Chance snow 0%
Seattle September 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 64 51 0.41 0.0
2022 78 55 0.00 0.0
2021 68 54 0.00 0.0
2020 71 58 0.07 0.0
2019 69 58 0.00 0.0
2018 66 53 0.05 0.0
2017 57 50 0.13 0.0
2016 67 49 0.00 0.0
2015 73 54 0.16 0.0
2014 76 58 0.00 0.0
2013 74 56 0.14 0.0
2012 67 50 0.00 0.0
2011 77 48 0.00 0.0
2010 64 54 0.02 0.0
2009 67 50 0.00 0.0
2008 58 54 0.54 n/a
2007 61 47 0.00 n/a
2006 55 51 0.29 n/a
2005 67 53 0.00 n/a
2004 63 47 0.00 n/a
2003 66 48 0.00 n/a
2002 66 48 0.00 n/a
2001 67 49 0.00 n/a
2000 64 53 0.04 n/a
1999 79 55 0.00 n/a
1998 69 53 0.00 n/a
1997 73 48 0.00 n/a
1996 59 49 0.01 0.0
1995 78 56 0.00 0.0
1994 76 55 0.00 0.0
1993 60 48 0.00 0.0
1992 65 58 0.00 0.0
1991 63 49 0.00 0.0
1990 73 52 0.00 0.0
1989 75 50 0.00 0.0
1988 68 50 0.00 0.0
1987 83 54 0.00 0.0
1986 62 49 0.00 0.0
1985 64 46 0.00 0.0
1984 65 52 0.21 0.0
1983 68 46 0.00 0.0
1982 63 55 0.06 0.0
1981 64 48 0.16 0.0
1980 63 51 0.10 0.0
1979 67 58 0.00 0.0
1978 58 52 0.25 0.0
1977 62 52 0.08 0.0
1976 86 59 0.00 0.0
1975 82 49 0.00 0.0
1974 88 57 0.00 0.0
1973 62 56 0.39 0.0
1972 57 47 1.05 0.0
1971 70 50 0.00 0.0
1970 59 52 0.20 0.0
1969 64 54 0.13 0.0
1968 59 46 0.00 0.0
1967 76 61 0.00 0.0
1966 71 51 0.00 0.0
1965 69 49 0.00 0.0
1964 63 49 0.00 0.0
1963 77 49 0.00 0.0
1962 64 54 0.00 0.0
1961 60 48 0.06 0.0
1960 61 46 0.00 0.0
1959 60 53 0.21 0.0
1958 61 49 0.10 0.0
1957 70 44 0.00 0.0
1956 65 50 0.03 0.0
1955 55 42 0.02 0.0
1954 69 55 0.00 0.0
1953 74 48 0.00 0.0
1952 80 55 0.00 0.0
1951 74 46 0.00 0.0
1950 71 42 0.00 0.0
1949 65 40 0.00 0.0
1948 69 52 0.00 0.0
1947 71 48 0.00 0.0
1946 64 54 0.00 0.0
1945 59 50 0.15 0.0
1944 69 58 0.00 0.0
1943 73 58 0.00 0.0
1942 73 51 0.00 0.0
1941 60 50 0.03 0.0
1940 70 49 0.00 0.0
1939 79 57 0.00 0.0
1938 75 58 0.00 0.0
1937 62 55 0.01 0.0
1936 67 50 0.00 0.0
1935 71 54 0.00 0.0
1934 71 49 0.00 0.0
1933 66 52 0.28 0.0
1932 64 50 0.04 0.0
1931 63 53 0.00 0.0
1930 75 52 0.00 0.0
1929 59 47 0.03 0.0
1928 64 47 0.00 0.0
1927 70 52 0.00 0.0
1926 64 48 0.01 0.0
1925 63 45 0.00 0.0
1924 59 46 0.00 0.0
1923 55 52 1.10 0.0
1922 66 51 0.00 0.0
1921 63 52 0.35 0.0
1920 60 52 0.08 0.0
1919 64 53 0.00 0.0
1918 63 51 0.00 0.0
1917 71 48 0.00 0.0
1916 68 48 0.00 0.0
1915 72 53 0.00 0.0
1914 62 52 0.05 0.0
1913 77 52 0.00 0.0
1912 73 51 0.00 0.0
1911 61 52 0.00 0.0
1910 71 56 0.00 0.0
1909 62 53 0.08 0.0
1908 66 52 0.00 0.0
1907 64 50 0.00 0.0
1906 68 50 0.00 0.0
1905 64 57 0.00 0.0
1904 65 45 0.00 0.0
1903 59 50 0.09 0.0
1902 68 42 0.00 0.0
1901 62 56 0.17 0.0
1900 63 54 0.01 0.0
1899 63 50 0.00 0.0
1898 68 58 0.28 0.0
1897 68 52 0.00 0.0
1896 76 47 0.00 0.0
1895 56 41 0.24 0.0
1894 60 51 0.02 0.0
What's the all-time high for Seattle on 9/20?
For the date of Sep 20, the highest temperature ever reached in Seattle history is 88 °F which happened in 1974.
Highest Temperatures in Seattle on September 20
Rank Temperature Year
1 88 °F 1974
2 86 °F 1976
3 83 °F 1987
4 82 °F 1975
5 80 °F 1952
6 79 °F 1999
6 79 °F 1939
8 78 °F 1995
8 78 °F 2022
10 77 °F 1913
10 77 °F 2011
10 77 °F 1963
What's the all-time low for Seattle on 9/20?
For the date of Sep 20, the lowest temperature ever reached in Seattle history is 40 °F which happened in 1949.
Lowest Temperatures in Seattle on September 20
Rank Temperature Year
1 40 °F 1949
2 41 °F 1895
3 42 °F 1955
3 42 °F 1950
3 42 °F 1902
6 44 °F 1957
7 45 °F 1925
7 45 °F 1904
9 46 °F 1968
9 46 °F 1983
9 46 °F 1951
9 46 °F 1924
9 46 °F 1960
9 46 °F 1985
Lowest High Temperatures in Seattle on September 20
Rank Temperature Year
1 55 °F 2006
1 55 °F 1955
1 55 °F 1923
4 56 °F 1895
5 57 °F 1972
5 57 °F 2017
7 58 °F 1978
7 58 °F 2008
9 59 °F 1929
9 59 °F 1970
9 59 °F 1945
9 59 °F 1924
9 59 °F 1968
9 59 °F 1996
9 59 °F 1903
What's the most it has ever rained in Seattle on 9/20?
For the date of Sep 20, the most precipitation ever recorded in Seattle history is 1.10 inches which happened in 1923.
All-Time Most Precipitation in Seattle on September 20
Rank Precipitation Year
1 1.10 inches 1923
2 1.05 inches 1972
3 0.54 inches 2008
4 0.41 inches 2023
5 0.39 inches 1973
6 0.35 inches 1921
7 0.29 inches 2006
8 0.28 inches 1933
8 0.28 inches 1898
10 0.25 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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