Average September Temperature in Seattle by Year

This page contains a list of the average monthly high and low temperatures in Seattle, Washington for the month of September each year between 1894 and 2023. It is based on NOAA data.

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What Was the Hottest September Ever in Seattle?

1967 was the warmest September in the history of Seattle, Washington. The average daily high temperature was 76.4 °F, and the average low was 55.0 °F.

What Was the Coldest September Ever in Seattle?

1972 was the coolest September in the history of Seattle, Washington. The average daily high temperature was 63.1 °F, and the average low was 47.6 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	34	70.6	53.4
2022	3	74.6	55.1
2021	35	70.4	53.4
2020	2	74.3	56.7
2019	21	69.4	56.1
2018	30	70.5	54.1
2017	5	73.8	55.6
2016	40	69.6	52.9
2015	60	68.5	52.5
2014	4	73.7	55.8
2013	13	70.4	56.5
2012	22	73.2	52.2
2011	11	73.5	54.5
2010	49	67.3	54.4
2009	29	71.6	53.2
2008	46	69.8	52.2
2007	64	67.4	52.5
2006	31	72.4	52.2
2005	76	68.1	50.9
2004	93	65.3	52.3
2003	26	71.7	53.5
2002	56	70.1	51.1
2001	68	67.7	51.8
2000	61	68.6	51.8
1999	52	70.9	50.7
1998	17	73.1	53.1
1997	33	70.9	53.5
1996	82	67.3	51.1
1995	10	73.4	54.6
1994	7	73.8	54.9
1993	36	73.5	50.2
1992	63	69.3	50.7
1991	20	73.4	52.3
1990	15	72.9	53.9
1989	8	75.1	53.0
1988	58	70.9	50.1
1987	28	73.3	51.8
1986	85	67.1	51.1
1985	108	65.9	50.3
1984	65	68.3	51.4
1983	107	66.1	50.4
1982	57	68.8	52.3
1981	43	70.5	51.6
1980	70	67.4	51.8
1979	25	70.9	54.3
1978	95	65.3	52.3
1977	91	66.8	51.0
1976	27	70.8	54.3
1975	19	73.3	52.6
1974	6	76.0	52.7
1973	37	70.3	53.4
1972	130	63.1	47.6
1971	119	65.5	49.6
1970	102	66.2	51.0
1969	48	68.9	52.9
1968	86	65.8	52.3
1967	1	76.4	55.0
1966	39	69.4	53.5
1965	106	66.5	50.2
1964	103	66.4	50.5
1963	12	73.3	53.7
1962	71	69.1	50.1
1961	97	68.3	49.1
1960	110	66.5	49.5
1959	120	64.4	50.4
1958	66	68.1	51.5
1957	24	73.5	51.9
1956	113	66.5	49.3
1955	124	66.0	47.9
1954	98	66.2	51.1
1953	69	69.7	49.6
1952	83	70.6	47.7
1951	88	69.5	48.6
1950	114	68.3	47.3
1949	54	71.0	50.5
1948	122	67.1	47.2
1947	42	69.1	53.0
1946	55	68.6	52.7
1945	78	67.2	51.6
1944	18	71.7	54.4
1943	16	72.4	54.3
1942	38	69.7	53.2
1941	90	64.8	53.0
1940	9	71.8	56.1
1939	41	69.4	52.7
1938	14	71.9	55.0
1937	44	68.5	53.5
1936	72	67.7	51.4
1935	23	71.4	54.0
1934	75	66.4	52.6
1933	118	64.3	50.8
1932	59	69.3	51.7
1931	81	65.2	53.3
1930	80	66.1	52.6
1929	51	69.5	52.1
1928	104	65.3	51.6
1927	99	64.9	52.5
1926	112	65.4	50.5
1925	74	66.4	52.6
1924	77	67.7	51.3
1923	50	68.7	53.0
1922	67	67.3	52.2
1921	125	63.8	50.2
1920	115	64.0	51.5
1919	73	67.1	52.1
1918	32	71.2	53.3
1917	92	65.8	52.0
1916	96	66.7	50.8
1915	87	66.1	52.1
1914	127	62.8	50.6
1913	94	66.5	51.1
1912	84	66.9	51.4
1911	123	63.4	50.8
1910	111	64.8	51.1
1909	62	68.3	51.9
1908	121	65.0	49.2
1907	100	65.3	52.0
1906	89	66.2	51.6
1905	79	65.8	52.9
1904	45	70.1	51.9
1903	116	64.4	51.0
1902	105	66.5	50.3
1901	109	65.8	50.2
1900	101	65.8	51.4
1899	47	69.7	52.2
1898	53	69.1	52.4
1897	126	63.9	50.0
1896	128	64.5	48.9
1895	129	63.0	48.6
1894	117	64.0	51.2

Weather Station Details

Years	Station	Coordinates
1948–2024	Seattle Tacoma International Airport	location
1894–1947	University of Washington	location