Sioux Falls, SD: September

30 September 2026: September 2026 averaged 67.5°F in Sioux Falls, SD, the warmest September since 2024, 8th warmest of 134.

September 2026

Mean temperature: 67.5°F; Warmest since 2024; 8th warmest of 134
Precipitation: 5.79 in; Wettest since 2018; 8th wettest of 133

A normal September in Sioux Falls, SD (1991 to 2020): a mean temperature of 62.8°F, between 59.6°F and 66.9°F in eight years of ten and 2.26 in of precipitation, between 0.83 in and 4.80 in in eight years of ten.

The mean temperature of every September in Sioux Falls, SD since 1893: 67.5°F in 2026; the highest is 69.9°F, in 1908.

Normal range, 59.6 to 66.9°F

Every year, ranked, as a table

Every September in Sioux Falls, SD from 1893 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank
2026	67.5	8	75.9	56	59.1	1	5.79	8
2025	66.9	14	80	9	53.8	28	0.22	130
2024	68.7	4	82.2	4	55.3	10	0.04	133
2023	69.5	2	82.6	3	56.4	5	0.51	124
2022	66.7	17	80.1	7	53.3	33	1.94	82
2021	67	13	79.5	14	54.5	20	3.21	48
2020	63.7	48	76.1	53	51.3	49	0.42	128
2019	67.4	9	77.2	35	57.6	2	4.50	22
2018	64.5	39	73.1	84	55.9	6	7.32	4
2017	65.1	32	76.4	48	53.8	28	1.62	91
2016	65.7	25	76	54	55.4	9	7.55	3
2015	67.1	11	77.2	35	57	3	3.24	45
2014	62.4	65	72.9	87	51.9	43	2.28	69
2013	66.9	14	78.6	25	55.3	10	0.77	116
2012	62.7	61	78.9	21	46.5	114	1.14	108
2011	59.6	104	72.7	88	46.5	114	0.20	132
2010	59.9	97	70.6	108	49.3	74	4.46	23
2009	63.4	52	74.6	72	52.3	38	1.21	105
2008	62.9	57	75.6	59	50.2	57	1.78	87
2007	63.5	50	76.2	51	50.8	52	2.27	70
2006	58.1	121	68.5	127	47.8	98	3.88	36
2005	67.4	9	79.8	12	55	14	4.76	17
2004	65.7	25	76.6	45	54.9	15	5.12	15
2003	60	95	72.7	88	47.2	107	4.74	18
2002	63.3	54	75	67	51.5	46	1.39	99
2001	61.2	81	72.4	92	50.1	58	2.25	72
2000	61.4	79	75.6	59	47.1	109	1.34	102
1999	59.7	102	73.1	84	46.3	117	0.84	113
1998	66.2	22	80.1	7	52.4	36	1.19	106
1997	62.4	65	75.1	65	49.7	68	1.59	93
1996	59.4	107	69.5	119	49.2	76	2.82	55
1995	60.4	88	72	95	48.8	80	1.86	85
1994	65.2	30	76.8	40	53.6	31	2.36	67
1993	56.8	130	67.9	128	45.6	122	1.88	84
1992	60.3	89	72.4	92	48.2	92	3.06	51
1991	62	70	73.7	80	50.3	56	3.95	33
1990	66.5	19	80.3	5	52.6	35	0.47	126
1989	60.2	91	72	95	48.3	88	3.38	42
1988	62.6	63	75.1	65	50	61	4.39	24
1987	62.8	59	75.8	58	49.8	65	2.05	78
1986	59.6	104	68.8	125	50.4	55	9.26	1
1985	58.2	119	66.5	132	49.8	65	3.34	44
1984	57.2	128	70.4	113	43.9	131	1.62	91
1983	63.5	50	76.8	40	50.1	58	1.92	83
1982	59.9	97	69.4	121	50.5	54	3.49	40
1981	63	55	77.7	32	48.3	88	0.50	125
1980	62	70	75.6	59	48.4	87	0.79	115
1979	64.3	43	76.6	45	51.9	43	4.03	31
1978	66.7	17	78.6	25	54.7	16	2.45	62
1977	61.9	73	71.6	98	52.1	41	5.63	10
1976	62.9	57	78.9	21	46.8	111	0.76	117
1975	57	129	69.2	123	44.7	126	1.35	101
1974	57.6	124	73.3	82	42	133	0.58	122
1973	60.1	92	70.5	110	49.6	69	5.61	11
1972	59.5	106	72.5	91	46.5	114	1.75	89
1971	61.5	78	74.7	71	48.3	88	3.23	46
1970	61.9	73	74.5	74	49.2	76	3.14	50
1969	62.3	68	75.3	64	49.3	74	2.41	63
1968	61	85	73	86	49	78	4.01	32
1967	61.3	80	74.8	70	47.8	98	0.87	112
1966	59.9	97	71.1	103	48.7	83	6.34	5
1965	51.4	134	60.1	134	42.8	132	4.91	16
1964	59.3	111	70.5	110	48	95	4.06	29
1963	64.2	44	76.4	48	52.1	41	2.40	64
1962	59.4	107	71.3	102	47.4	103	3.58	38
1961	59.2	112	70.5	110	48	95	2.36	67
1960	62.8	59	74	77	51.6	45	2.21	75
1959	61.2	81	72.4	92	49.9	64	4.62	21
1958	63.9	47	77.7	32	50.1	58	2.11	77
1957	59.1	113	70.4	113	47.8	98	2.66	58
1956	61.2	81	77	38	45.3	123	0.29	129
1955	63.4	52	77	38	49.8	65	0.72	118
1954	62.5	64	74	77	50.9	50	4.33	26
1953	61.6	75	76	54	47.2	107	2.51	61
1952	64.4	41	78.9	21	50	61	0.47	126
1951	56	133	67.8	129	44.3	130	3.40	41
1950	62.1	69	75.6	59	48.6	85	3.75	37
1949	57.7	123	70.9	104	44.4	128	3.90	35
1948	67.1	11	80.2	6	53.9	25	2.97	52
1947	64	45	77.1	37	50.9	50	2.82	55
1946	59.9	97	70.9	104	48.8	80	5.21	14
1945	60.1	92	70.7	106	49.6	69	2.17	76
1944	60.1	92	69.5	119	50.6	53	1.85	86
1943	58.3	117	69.9	118	46.7	112	0.55	123
1942	57.3	127	66.3	133	48.3	88	2.52	60
1941	64.7	37	76.3	50	53.1	34	1.70	90
1940	65.3	29	76.2	51	54.4	21	1.27	104
1939	66.4	21	79.1	17	53.6	31	1.12	109
1938	65.9	24	76.7	44	55.1	13	5.89	7
1937	65.6	27	76.8	40	54.3	22	1.48	96
1936	67.9	5	80	9	55.7	7	1.05	111
1935	65.1	32	77.7	32	52.4	36	1.77	88
1934	56.8	130	68.6	126	44.9	124	3.93	34
1933	65.6	27	75.9	56	55.2	12	3.56	39
1932	59.8	101	71.5	100	48.1	94	2.58	59
1931	67.7	6	78.9	21	56.6	4	4.28	27
1930	61.1	84	72.6	90	49.5	71	2.68	57
1929	58.3	117	67.7	130	48.9	79	8.28	2
1928	59.4	107	71.4	101	47.4	103	2.95	54
1927	64.4	41	74.3	75	54.6	18	2.27	70
1926	60.8	86	70.1	116	51.5	46	5.47	13
1925	67.6	7	79.4	15	55.7	7	1.45	97
1924	58.8	115	70	117	47.6	101	1.37	100
1923	64.9	34	75	67	54.7	16	5.79	8
1922	66.5	19	79.1	17	53.9	25	1.19	106
1921	64.6	38	75.4	63	53.8	28	1.97	80
1920	66.2	22	78.6	25	53.9	25	2.23	74
1919	66.9	14	79.1	17	54.6	18	1.59	93
1918	58.2	119	71.6	98	44.7	126	1.10	110
1917	60.6	87	73.3	82	47.9	97	1.58	95
1916	60	95	73.9	79	46.1	118	2.25	72
1915	58.4	116	69.3	122	47.5	102	4.08	28
1914	61.6	75	74.6	72	48.6	85	4.68	19
1913	64	45	78.5	28	49.5	71	1.30	103
1912	57.5	125	69.1	124	45.9	120	3.36	43
1911	61.6	75	73.6	81	49.5	71	3.22	47
1910	64.8	35	78	30	51.5	46	2.38	66
1909	62.7	61	76.6	45	48.7	83	2.00	79
1908	69.9	1	85.6	1	54.2	23	1.44	98
1907	59.4	107	71.8	97	47	110	2.40	64
1906	64.5	39	76.8	40	52.3	38	5.49	12
1905	65.2	30	78.2	29	52.2	40	4.39	24
1904	63	55	77.8	31	48.2	92	0.66	119
1903	58.9	114	70.4	113	47.3	105	1.96	81
1902	56.6	132	67.3	131	46	119	3.17	49
1901	59.7	102	70.7	106	48.8	80	5.91	6
1900	60.3	89	74.1	76	46.6	113	4.06	29
1899	57.8	122	74.9	69	40.6	134	0.21	131
1898	62.4	65	79	20	45.7	121	0.81	114
1897	69	3	83.8	2	54.2	23
1896	57.5	125	70.6	108	44.4	128	4.63	20
1895	64.8	35	79.6	13	50	61	2.97	52
1894	63.6	49	79.9	11	47.3	105	0.62	120
1893	62	70	79.2	16	44.8	125	0.60	121

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1908	69.9
2023	69.5
1897	69
2024	68.7
1936	67.9
1931	67.7
1925	67.6
2026	67.5
2019	67.4
2005	67.4

Coldest
Year	Mean, °F
1965	51.4
1951	56
1902	56.6
1993	56.8
1934	56.8
1975	57
1984	57.2
1942	57.3
1912	57.5
1896	57.5

Wettest
Year	Precipitation, in
1986	9.26
1929	8.28
2016	7.55
2018	7.32
1966	6.34
1901	5.91
1938	5.89
2026	5.79
1923	5.79
1977	5.63

Driest
Year	Precipitation, in
2024	0.04
2011	0.20
1899	0.21
2025	0.22
1956	0.29
2020	0.42
1990	0.47
1952	0.47
1981	0.50
2023	0.51

The hottest, coldest and wettest days

Hottest day: 99°F; 4 September 2026
Coldest night: 46°F; 16 September 2026
Wettest day: 0.90 in; 18 September 2026

Every month, season and year

Months

Seasons

Years

Sioux Falls, SD the day's answers

All-time records

Every answer in words

September 2026 brought 5.79 in of precipitation in Sioux Falls, SD, the wettest September since 2018, tied 8th wettest of 133 (with 1923).
The hottest day of September 2026 in Sioux Falls, SD: 99°F on Friday 4 September 2026.
The coldest night of September 2026 in Sioux Falls, SD: a low of 46°F on Wednesday 16 September 2026.
The wettest day of September 2026 in Sioux Falls, SD: 0.90 in on Friday 18 September 2026.