Average September Temperature in Interior by Year

This page contains a list of the average monthly high and low temperatures in Interior, South Dakota for the month of September each year between 1955 and 2023. It is based on NOAA data.

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What Was the Hottest September Ever in Interior?

1998 was the warmest September in the history of Interior, South Dakota. The average daily high temperature was 87.8 °F, and the average low was 58.0 °F.

What Was the Coldest September Ever in Interior?

1965 was the coolest September in the history of Interior, South Dakota. The average daily high temperature was 66.4 °F, and the average low was 42.5 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	10	85.5	54.8
2022	2	90.3	53.9
2021	5	88.0	53.4
2020	34	83.5	49.0
2019	18	84.2	52.4
2018	42	77.7	53.0
2017	32	81.9	50.8
2016	23	82.8	51.5
2015	9	86.5	54.1
2014	48	79.4	48.9
2013	14	86.1	52.0
2012	13	85.7	52.4
2011	40	81.2	49.6
2010	35	82.8	49.7
2009	21	82.2	53.1
2008	43	79.9	50.6
2007	15	84.5	53.2
2006	62	73.9	48.2
2005	6	88.1	53.1
2004	27	80.2	53.6
2003	49	79.5	48.6
2002	24	81.6	52.6
2001	20	82.9	53.0
2000	17	85.4	51.5
1999	58	76.7	46.7
1998	1	87.8	58.0
1997	4	83.6	58.1
1996	55	76.2	50.1
1995	45	78.9	51.0
1994	26	82.5	51.4
1993	63	74.2	47.6
1992	22	83.2	51.4
1991	31	80.6	52.4
1990	12	84.9	55.1
1989	41	79.7	51.1
1988	53	78.6	48.9
1987	38	82.1	49.1
1986	64	71.5	49.5
1985	59	75.4	47.1
1983	29	83.0	50.7
1981	28	84.4	49.3
1980	30	82.1	51.6
1979	3	89.3	53.3
1978	7	86.5	54.4
1977	44	80.3	50.0
1974	57	78.3	46.1
1973	60	73.7	48.8
1972	33	82.8	49.9
1971	50	78.7	49.0
1970	46	80.4	49.4
1969	11	85.1	55.0
1968	52	78.7	48.9
1967	37	79.9	51.4
1966	47	78.3	50.5
1965	65	66.4	42.5
1964	51	80.3	47.4
1963	8	84.4	56.5
1962	39	81.5	49.4
1961	61	75.2	47.0
1960	25	82.4	51.7
1959	54	77.2	49.8
1958	16	84.4	53.3
1957	56	78.0	48.2
1956	36	83.4	48.2
1955	19	84.4	52.1

Weather Station Details

Years	Station	Coordinates
1949–2024	Interior 3 Ne	location