Average September Temperature in Watertown by Year

This page contains a list of the average monthly high and low temperatures in Watertown, South Dakota for the month of September each year between 1897 and 2023. It is based on NOAA data.

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What Was the Hottest September Ever in Watertown?

1931 was the warmest September in the history of Watertown, South Dakota. The average daily high temperature was 81.3 °F, and the average low was 53.5 °F.

What Was the Coldest September Ever in Watertown?

1965 was the coolest September in the history of Watertown, South Dakota. The average daily high temperature was 57.3 °F, and the average low was 39.4 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	3	77.5	53.6
2022	20	76.6	49.9
2021	19	75.4	51.1
2020	74	70.7	47.6
2019	26	72.5	52.3
2018	46	70.3	50.9
2017	31	72.5	51.4
2016	29	71.7	52.4
2015	5	77.0	53.6
2014	58	70.4	48.8
2013	4	77.6	53.1
2012	59	75.4	43.7
2011	83	71.0	44.9
2010	92	67.5	47.5
2009	28	72.6	51.9
2008	62	71.5	47.3
2007	38	73.1	49.4
2006	106	65.3	46.1
2005	10	75.9	52.3
2004	18	74.5	52.2
2003	86	70.1	45.4
2002	37	72.7	49.9
2001	51	71.3	49.1
2000	67	73.3	45.3
1999	97	68.4	45.9
1998	13	77.5	49.9
1997	41	73.2	49.0
1996	87	68.7	46.6
1995	81	69.9	46.5
1994	36	72.5	50.2
1993	117	66.3	43.5
1992	80	69.9	46.5
1991	54	71.0	48.4
1990	12	77.7	50.1
1989	68	71.9	46.8
1988	39	74.1	48.4
1987	40	72.7	49.6
1986	91	66.7	48.3
1985	98	65.5	48.0
1984	119	67.8	41.0
1983	60	71.2	47.8
1982	84	68.7	47.1
1981	50	73.9	46.6
1980	63	72.7	46.1
1979	30	75.7	48.4
1978	7	77.2	52.3
1977	75	68.8	49.0
1976	43	76.0	45.5
1975	114	67.4	43.2
1974	115	70.2	39.8
1973	96	67.7	46.6
1972	82	70.3	45.6
1971	76	70.5	46.7
1970	52	72.7	47.4
1969	42	74.2	47.8
1968	79	69.7	47.2
1967	69	72.1	46.4
1966	89	69.1	46.1
1965	124	57.3	39.4
1964	100	68.1	44.6
1963	32	73.3	50.0
1962	104	68.2	43.9
1961	107	67.6	43.8
1960	49	72.5	48.1
1959	64	71.5	47.3
1958	35	74.8	48.1
1957	101	68.5	44.2
1956	99	70.9	42.2
1955	66	72.7	46.0
1954	77	68.8	48.3
1953	65	73.0	45.8
1952	27	77.2	47.4
1951	121	64.8	42.5
1950	72	71.5	46.9
1949	113	67.5	43.1
1948	17	75.8	50.9
1947	57	72.2	47.0
1946	90	68.7	46.4
1945	95	68.1	46.3
1943	108	67.8	43.5
1942	122	64.1	42.2
1941	47	72.7	48.4
1940	15	76.6	50.4
1939	14	78.3	48.8
1938	16	76.5	50.2
1937	34	74.3	48.7
1936	8	79.0	50.3
1935	25	78.2	46.7
1934	112	68.6	42.0
1933	2	80.4	52.1
1932	53	76.2	43.7
1931	1	81.3	53.5
1930	61	74.1	44.8
1929	110	66.6	44.5
1928	105	68.8	42.8
1927	45	73.4	47.9
1926	109	66.6	44.5
1925	21	76.2	49.4
1924	102	67.5	45.0
1923	22	75.2	50.2
1922	9	79.0	49.5
1921	56	71.2	48.1
1920	23	74.4	50.8
1919	24	75.8	49.2
1918	118	69.1	39.8
1917	93	69.2	45.8
1916	103	68.9	43.3
1915	94	69.8	44.9
1914	71	73.6	44.9
1913	73	72.5	45.8
1912	111	69.8	41.1
1911	78	71.8	45.3
1910	70	72.2	46.3
1909	48	73.6	47.3
1908	11	78.1	50.1
1907	120	66.0	42.1
1906	44	72.1	49.3
1905	33	74.6	48.5
1904	85	70.9	44.8
1903	116	67.1	42.7
1900	88	69.3	46.0
1899	123	69.0	37.1
1898	55	75.1	44.2
1897	6	80.6	48.9

Weather Station Details

Years	Station	Coordinates
1893–2024	Watertown Regional Airport	location