Seattle September 18 Weather Records

Daily averages and all-time records for weather in Seattle, Washington for the date of September 18.
September 18 All-Time Records
1894–2024
Highest temperature 85 °F 1991
Lowest temperature 41 °F 1955
Lowest daily high 54 °F 1916
Highest daily low 60 °F 2020
Most precipitation 0.81 inches 2021
Most snow none -
September 18 Average Weather
1991–2020 1
Average high 69.9 °F
Average low 52.6 °F
Chance precipitation 29.6%
Chance snow 0%
Seattle September 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 67 54 0.11 0.0
2022 74 55 0.00 0.0
2021 64 52 0.81 0.0
2020 66 60 0.29 0.0
2019 68 55 0.10 0.0
2018 67 48 0.00 0.0
2017 62 50 0.16 0.0
2016 68 54 0.00 0.0
2015 67 55 0.00 0.0
2014 67 59 0.01 0.0
2013 70 56 0.00 0.0
2012 82 53 0.00 0.0
2011 65 52 0.28 0.0
2010 72 59 0.78 0.0
2009 80 54 0.00 0.0
2008 60 54 0.00 n/a
2007 62 48 0.00 n/a
2006 68 55 0.39 n/a
2005 67 49 0.00 n/a
2004 56 49 0.10 n/a
2003 66 53 0.02 n/a
2002 70 47 0.00 n/a
2001 61 53 0.04 n/a
2000 70 60 0.01 n/a
1999 76 55 0.00 n/a
1998 72 55 0.14 n/a
1997 64 52 0.05 n/a
1996 60 47 0.20 0.0
1995 74 57 0.00 0.0
1994 73 58 0.00 0.0
1993 65 46 0.00 0.0
1992 72 47 0.10 0.0
1991 85 57 0.00 0.0
1990 75 54 0.00 0.0
1989 70 48 0.00 0.0
1988 59 43 0.31 0.0
1987 73 50 0.00 0.0
1986 65 51 0.22 0.0
1985 63 47 0.00 0.0
1984 73 56 0.00 0.0
1983 59 46 0.57 0.0
1982 78 52 0.00 0.0
1981 76 56 0.12 0.0
1980 59 54 0.05 0.0
1979 77 54 0.00 0.0
1978 64 43 0.00 0.0
1977 63 55 0.14 0.0
1976 70 55 0.00 0.0
1975 73 50 0.00 0.0
1974 78 51 0.00 0.0
1973 66 56 0.05 0.0
1972 62 47 0.15 0.0
1971 74 48 0.00 0.0
1970 60 54 0.12 0.0
1969 67 53 0.35 0.0
1968 56 48 0.30 0.0
1967 74 55 0.00 0.0
1966 66 54 0.07 0.0
1965 67 42 0.00 0.0
1964 66 49 0.00 0.0
1963 72 49 0.00 0.0
1962 72 50 0.00 0.0
1961 68 53 0.01 0.0
1960 67 51 0.00 0.0
1959 65 55 0.45 0.0
1958 63 53 0.09 0.0
1957 68 45 0.00 0.0
1956 58 49 0.00 0.0
1955 67 41 0.00 0.0
1954 62 53 0.05 0.0
1953 71 44 0.00 0.0
1952 80 52 0.00 0.0
1951 65 48 0.00 0.0
1950 70 44 0.00 0.0
1949 63 51 0.08 0.0
1948 70 41 0.00 0.0
1947 66 44 0.00 0.0
1946 72 49 0.00 0.0
1945 67 52 0.00 0.0
1944 68 45 0.00 0.0
1943 67 54 0.00 0.0
1942 73 46 0.00 0.0
1941 64 50 0.10 0.0
1940 65 55 0.00 0.0
1939 69 53 0.00 0.0
1938 68 58 0.14 0.0
1937 61 56 0.00 0.0
1936 72 54 0.00 0.0
1935 69 52 0.00 0.0
1934 69 56 0.00 0.0
1933 62 53 0.03 0.0
1932 57 46 0.00 0.0
1931 65 55 0.17 0.0
1930 68 56 0.03 0.0
1929 61 54 0.00 0.0
1928 61 53 0.00 0.0
1927 76 57 0.00 0.0
1926 61 45 0.00 0.0
1925 60 51 0.45 0.0
1924 58 49 0.15 0.0
1923 72 52 0.00 0.0
1922 74 49 0.00 0.0
1921 58 53 0.61 0.0
1920 64 52 0.00 0.0
1919 71 58 0.00 0.0
1918 75 53 0.00 0.0
1917 70 51 0.00 0.0
1916 54 50 0.00 0.0
1915 76 52 0.00 0.0
1914 61 53 0.31 0.0
1913 67 54 0.02 0.0
1912 66 50 0.00 0.0
1911 63 47 0.00 0.0
1910 68 49 0.00 0.0
1909 61 47 0.00 0.0
1908 67 45 0.00 0.0
1907 60 50 0.00 0.0
1906 73 53 0.00 0.0
1905 69 55 0.00 0.0
1904 58 51 0.00 0.0
1903 64 52 0.00 0.0
1902 57 46 0.09 0.0
1901 75 53 0.00 0.0
1900 64 46 0.00 0.0
1899 73 50 0.00 0.0
1898 74 49 0.00 0.0
1897 76 51 0.00 0.0
1896 70 47 0.00 0.0
1895 67 51 0.00 0.0
1894 62 55 0.06 0.0
What's the all-time high for Seattle on 9/18?
For the date of Sep 18, the highest temperature ever reached in Seattle history is 85 °F which happened in 1991.
Highest Temperatures in Seattle on September 18
Rank Temperature Year
1 85 °F 1991
2 82 °F 2012
3 80 °F 1952
3 80 °F 2009
5 78 °F 1982
5 78 °F 1974
7 77 °F 1979
8 76 °F 1915
8 76 °F 1999
8 76 °F 1897
8 76 °F 1927
8 76 °F 1981
What's the all-time low for Seattle on 9/18?
For the date of Sep 18, the lowest temperature ever reached in Seattle history is 41 °F which has happened 2 times, most recently in 1955.
Lowest Temperatures in Seattle on September 18
Rank Temperature Year
1 41 °F 1948
1 41 °F 1955
3 42 °F 1965
4 43 °F 1978
4 43 °F 1988
6 44 °F 1950
6 44 °F 1947
6 44 °F 1953
9 45 °F 1957
9 45 °F 1908
9 45 °F 1926
9 45 °F 1944
Lowest High Temperatures in Seattle on September 18
Rank Temperature Year
1 54 °F 1916
2 56 °F 1968
2 56 °F 2004
4 57 °F 1932
4 57 °F 1902
6 58 °F 1924
6 58 °F 1904
6 58 °F 1956
6 58 °F 1921
10 59 °F 1983
10 59 °F 1988
10 59 °F 1980
What's the most it has ever rained in Seattle on 9/18?
For the date of Sep 18, the most precipitation ever recorded in Seattle history is 0.81 inches which happened in 2021.
All-Time Most Precipitation in Seattle on September 18
Rank Precipitation Year
1 0.81 inches 2021
2 0.78 inches 2010
3 0.61 inches 1921
4 0.57 inches 1983
5 0.45 inches 1959
5 0.45 inches 1925
7 0.39 inches 2006
8 0.35 inches 1969
9 0.31 inches 1988
9 0.31 inches 1914
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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