Washington September Temperature by Year

This page is a list of the average statewide temperature in the month of September in Washington for each year from 1895–2023. It is a statewide average over the entire territory of the state, based on data from the NOAA.

State:

Month:

What Was the Hottest September in Washington History?

1967 was the warmest September in Washington history. Statewide, the average daily high temperature was 76.8 °F, and the average low was 47.8 °F.

What Was the Coldest September in Washington History?

1895 was the coolest September in Washington history. Statewide, the average daily high temperature was 60.7 °F, and the average low was 41.3 °F.

Click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	37	69.6	47.2
2022	5	74.6	48.8
2021	45	69.8	46.3
2020	7	73.3	49.1
2019	63	66.6	47.7
2018	79	68.1	44.6
2017	20	71.9	47.7
2016	78	68.1	44.8
2015	82	67.9	44.5
2014	20	72.0	47.7
2013	24	69.9	49.4
2012	24	73.9	45.5
2011	9	74.5	47.6
2010	63	67.1	47.0
2009	19	73.1	46.6
2008	50	71.0	44.7
2007	72	68.9	44.5
2006	33	72.1	45.5
2005	92	68.1	43.3
2004	83	66.7	45.5
2003	16	73.0	47.1
2002	54	70.6	44.3
2001	20	72.6	46.9
2000	79	67.8	44.8
1999	63	71.2	43.0
1998	2	76.0	48.4
1997	30	70.6	47.8
1996	100	66.4	43.5
1995	10	73.3	48.4
1994	7	74.4	48.0
1993	37	72.2	44.6
1992	97	67.5	43.4
1991	14	74.3	46.5
1990	2	75.9	48.5
1989	32	73.3	44.7
1988	58	70.2	44.4
1987	12	75.0	46.2
1986	113	64.1	44.2
1985	123	63.5	42.6
1984	104	66.5	42.9
1983	113	65.9	42.3
1982	60	68.5	45.9
1981	51	70.5	44.9
1980	63	68.4	45.8
1979	16	72.7	47.3
1978	99	64.3	45.9
1977	111	64.4	44.1
1976	24	72.4	46.9
1975	35	73.1	44.0
1974	20	74.9	44.8
1973	53	69.5	45.7
1972	124	64.5	41.6
1971	120	64.9	41.8
1970	122	64.8	41.5
1969	56	68.2	46.5
1968	63	68.4	45.8
1967	1	76.8	47.8
1966	16	72.2	47.9
1965	113	66.2	42.0
1964	109	66.2	42.6
1963	6	74.6	48.6
1962	45	71.2	44.8
1961	110	66.7	41.9
1960	70	70.2	43.6
1959	108	63.8	45.2
1958	76	68.1	44.8
1957	14	74.5	46.3
1956	68	69.8	44.2
1955	76	68.9	44.0
1954	83	67.1	45.0
1953	41	71.6	44.9
1952	24	74.0	45.4
1951	45	71.2	44.7
1950	41	72.6	43.8
1949	37	71.4	45.4
1948	96	67.9	43.0
1947	51	69.9	45.4
1946	85	67.6	44.5
1945	100	66.8	43.2
1944	29	72.8	46.4
1943	24	74.8	44.7
1942	33	73.0	44.7
1941	120	62.4	44.4
1940	13	71.7	49.3
1939	44	71.4	44.7
1938	4	75.8	48.2
1937	40	70.8	45.8
1936	85	69.2	42.7
1935	30	73.2	45.3
1934	103	66.3	43.2
1933	124	63.5	42.5
1932	60	71.7	42.6
1931	89	66.6	45.0
1930	60	68.8	45.7
1929	89	69.1	42.5
1928	72	70.5	43.0
1927	104	64.1	45.4
1926	128	63.6	40.7
1925	72	68.6	44.8
1924	70	70.3	43.5
1923	36	72.6	44.4
1922	41	71.4	45.1
1921	127	63.2	41.1
1920	98	65.8	44.7
1919	85	68.6	43.3
1918	10	75.5	46.0
1917	58	69.1	45.5
1916	85	68.8	43.2
1915	93	67.7	43.4
1914	117	64.4	43.3
1913	89	68.8	42.7
1912	111	66.5	41.9
1911	119	63.7	43.2
1910	93	67.2	43.9
1909	45	71.1	44.9
1908	79	70.0	42.6
1907	93	67.5	43.8
1906	75	68.6	44.6
1905	68	67.9	46.1
1904	54	71.7	43.4
1903	118	64.2	43.2
1902	104	67.7	41.6
1901	126	63.3	42.4
1900	100	65.8	44.1
1899	45	71.0	44.9
1898	56	69.6	45.1
1897	107	66.1	43.0
1896	113	66.2	41.9
1895	129	60.7	41.3