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Topics / Climate / United States / South Dakota

Was September normal in South Dakota?

September 2026 · 66 counties · data family: climatedata.dev

Much warmer than normal

65.6°FStatewide average temperature, September 2026

+4.1°F against the 1991–2020 normal of 61.5°F
9th warmest September of 132 since 1895
Of 66 counties: 45 much warmer, 21 warmer
Furthest above normal: Miner County (+5.7°F); least: McPherson County (+2.7°F)
Precipitation 3.23 in, 169% of normal: much wetter than normal

Every South Dakota county, September 2026September 2026 was warmer than normal in every county with a figure: 45 much warmer, 21 warmer; furthest above normal Miner County (+5.7°F), least McPherson County (+2.7°F).Choose a county to see its answer. The colour shows how far each county was from its own 1991–2020 normal.

+4°F or more 44
+3 to +4°F 19
+2 to +3°F 3
+1 to +2°F 0
within 1°F 0
−1 to −2°F 0

Much warmer than normal 45
Warmer than normal 21
Near normal 0
Cooler than normal 0
Much cooler than normal 0

Every September since 1895, South Dakota statewideSeptember 2026 averaged 65.6°F, +4.1°F against the 1991–2020 normal: the 9th warmest September of 132 since 1895.

Show the numbers (132 rows)

Year	September average
2026	65.6°F
2025	64.8°F
2024	68.2°F
2023	64.8°F
2022	65.4°F
2021	65.0°F
2020	60.4°F
2019	63.1°F
2018	61.5°F
2017	61.8°F
2016	62.4°F
2015	65.9°F
2014	60.5°F
2013	65.8°F
2012	62.6°F
2011	59.9°F
2010	59.1°F
2009	63.0°F
2008	60.3°F
2007	62.6°F
2006	56.8°F
2005	65.5°F
2004	63.0°F
2003	60.0°F
2002	62.7°F
2001	62.1°F
2000	62.3°F
1999	57.1°F
1998	66.9°F
1997	63.1°F
1996	58.8°F
1995	59.5°F
1994	62.5°F
1993	55.0°F
1992	59.8°F
1991	60.8°F
1990	65.0°F
1989	60.3°F
1988	59.8°F
1987	60.6°F
1986	56.5°F
1985	56.8°F
1984	55.9°F
1983	60.8°F
1982	59.4°F
1981	61.9°F
1980	61.3°F
1979	64.4°F
1978	65.4°F
1977	60.6°F
1976	62.3°F
1975	57.7°F
1974	57.2°F
1973	57.5°F
1972	59.8°F
1971	59.0°F
1970	60.6°F
1969	63.5°F
1968	59.4°F
1967	61.0°F
1966	59.7°F
1965	49.6°F
1964	58.4°F
1963	63.9°F
1962	58.1°F
1961	56.2°F
1960	61.6°F
1959	58.9°F
1958	62.7°F
1957	57.6°F
1956	59.9°F
1955	61.3°F
1954	60.6°F
1953	61.1°F
1952	64.4°F
1951	55.0°F
1950	59.4°F
1949	57.5°F
1948	65.8°F
1947	61.6°F
1946	59.2°F
1945	58.4°F
1944	59.5°F
1943	59.0°F
1942	56.4°F
1941	60.4°F
1940	66.1°F
1939	64.3°F
1938	64.2°F
1937	62.9°F
1936	64.2°F
1935	62.1°F
1934	55.6°F
1933	65.1°F
1932	60.0°F
1931	66.7°F
1930	60.3°F
1929	55.5°F
1928	58.0°F
1927	60.8°F
1926	57.0°F
1925	63.6°F
1924	57.9°F
1923	61.4°F
1922	64.2°F
1921	60.3°F
1920	61.6°F
1919	62.8°F
1918	55.4°F
1917	59.4°F
1916	58.6°F
1915	57.7°F
1914	62.3°F
1913	61.2°F
1912	54.4°F
1911	60.4°F
1910	59.8°F
1909	60.8°F
1908	65.6°F
1907	56.8°F
1906	62.6°F
1905	62.6°F
1904	59.4°F
1903	55.6°F
1902	56.2°F
1901	57.2°F
1900	59.0°F
1899	59.5°F
1898	60.4°F
1897	67.7°F
1896	55.4°F
1895	61.3°F

All 66 counties, September 2026

Record rank: 1 is the warmest September on record for that county.


1	Miner	67.6°F	+5.7°F	3 of 132	Much warmer than normal
2	Hanson	68.3°F	+5.5°F	4 of 132	Much warmer than normal
3	Lake	66.4°F	+5.4°F	5 of 132	Much warmer than normal
4	McCook	67.6°F	+5.4°F	4 of 132	Much warmer than normal
5	Kingsbury	66.1°F	+5.2°F	5 of 132	Much warmer than normal
6	Hutchinson	68.4°F	+5.1°F	5 of 132	Much warmer than normal
7	Brookings	65.1°F	+5.0°F	6 of 132	Much warmer than normal
8	Hamlin	64.8°F	+5.0°F	5 of 132	Much warmer than normal
9	Moody	65.9°F	+5.0°F	6 of 132	Much warmer than normal
10	Turner	67.8°F	+5.0°F	6 of 132	Much warmer than normal
11	Davison	67.9°F	+4.8°F	8 of 132	Much warmer than normal
12	Minnehaha	66.8°F	+4.8°F	5 of 132	Much warmer than normal
13	Yankton	68.4°F	+4.8°F	8 of 132	Much warmer than normal
14	Codington	64.1°F	+4.7°F	7 of 132	Much warmer than normal
15	Sanborn	67.4°F	+4.7°F	9 of 132	Much warmer than normal
16	Clark	65.0°F	+4.6°F	7 of 132	Much warmer than normal
17	Deuel	64.3°F	+4.6°F	6 of 132	Much warmer than normal
18	Bon Homme	68.5°F	+4.5°F	13 of 132	Much warmer than normal
19	Clay	68.0°F	+4.5°F	11 of 132	Much warmer than normal
20	Union	68.0°F	+4.5°F	9 of 132	Much warmer than normal
21	Douglas	67.8°F	+4.4°F	11 of 132	Much warmer than normal
22	Fall River	66.6°F	+4.4°F	5 of 132	Much warmer than normal
23	Grant	64.8°F	+4.4°F	8 of 132	Much warmer than normal
24	Haakon	67.2°F	+4.4°F	8 of 132	Much warmer than normal
25	Lincoln	67.1°F	+4.4°F	10 of 132	Much warmer than normal
26	Oglala Lakota	67.1°F	+4.4°F	5 of 132	Much warmer than normal
27	Butte	64.9°F	+4.3°F	5 of 132	Much warmer than normal
28	Harding	63.3°F	+4.3°F	9 of 132	Much warmer than normal
29	Roberts	64.5°F	+4.3°F	8 of 132	Much warmer than normal
30	Ziebach	66.0°F	+4.3°F	10 of 132	Much warmer than normal
31	Beadle	66.5°F	+4.2°F	11 of 132	Much warmer than normal
32	Custer	64.1°F	+4.2°F	5 of 132	Much warmer than normal
33	Day	63.7°F	+4.2°F	9 of 132	Much warmer than normal
34	Jackson	67.5°F	+4.2°F	8 of 132	Much warmer than normal
35	Lawrence	60.8°F	+4.2°F	5 of 132	Much warmer than normal
36	Bennett	66.2°F	+4.1°F	8 of 132	Much warmer than normal
37	Meade	65.6°F	+4.1°F	8 of 132	Much warmer than normal
38	Pennington	64.7°F	+4.1°F	9 of 132	Much warmer than normal
39	Perkins	63.9°F	+4.1°F	10 of 132	Much warmer than normal
40	Spink	65.4°F	+4.1°F	12 of 132	Much warmer than normal
41	Charles Mix	68.2°F	+4.0°F	14 of 132	Warmer than normal
42	Dewey	65.6°F	+4.0°F	12 of 132	Much warmer than normal
43	Stanley	67.2°F	+4.0°F	9 of 132	Much warmer than normal
44	Todd	66.8°F	+4.0°F	13 of 132	Much warmer than normal
45	Mellette	67.4°F	+3.8°F	17 of 132	Warmer than normal
46	Aurora	66.8°F	+3.7°F	15 of 132	Warmer than normal
47	Brown	63.9°F	+3.7°F	12 of 132	Much warmer than normal
48	Corson	63.9°F	+3.7°F	15 of 132	Warmer than normal
49	Marshall	63.2°F	+3.7°F	12 of 132	Much warmer than normal
50	Tripp	67.5°F	+3.7°F	15 of 132	Warmer than normal
51	Gregory	67.4°F	+3.6°F	16 of 132	Warmer than normal
52	Jerauld	65.9°F	+3.5°F	15 of 132	Warmer than normal
53	Jones	67.0°F	+3.5°F	17 of 132	Warmer than normal
54	Hand	64.9°F	+3.4°F	17 of 132	Warmer than normal
55	Hughes	66.3°F	+3.4°F	14 of 132	Warmer than normal
56	Lyman	67.2°F	+3.4°F	17 of 132	Warmer than normal
57	Sully	65.3°F	+3.4°F	15 of 132	Warmer than normal
58	Faulk	63.7°F	+3.3°F	19 of 132	Warmer than normal
59	Brule	66.8°F	+3.2°F	16 of 132	Warmer than normal
60	Buffalo	65.9°F	+3.2°F	16 of 132	Warmer than normal
61	Campbell	63.0°F	+3.0°F	22 of 132	Warmer than normal
62	Hyde	64.3°F	+3.0°F	19 of 132	Warmer than normal
63	Potter	63.6°F	+3.0°F	20 of 132	Warmer than normal
64	Edmunds	62.7°F	+2.8°F	25 of 132	Warmer than normal
65	Walworth	63.2°F	+2.8°F	20 of 132	Warmer than normal
66	McPherson	61.7°F	+2.7°F	24 of 132	Warmer than normal

Get this data

This page's numbers, as JSON:

curl https://visualizedata.org/data/topics/climate/us-sd.json

The climatedata.dev API it comes from (live, no key; every month since 1895 with its normal, anomaly and rank):

curl "https://api.climatedata.dev/v1/us-climate/tavg/us-sd.json"

Open the JSON

What this can't tell you

A statewide average is not the average of its counties: NOAA computes it from its own grid, weighted by area.
The most recent months are preliminary and NOAA revises them in the next release.

How the answer is decided

Each month is ranked against the same month in every year on record (since 1895 for most places). The top tenth of the record is 'much warmer than normal', the top third 'warmer', the middle third 'near normal'. Counties are coloured by the same five words.

Sources

climatedata.dev us-climate, version 2026-10-25.6c7474e6d8 (U.S. public domain)
NOAA Monthly U.S. Climate Divisional Database (nClimDiv), statewide and national files (U.S. public domain)
climatedata.dev county-climate, version 2026-10-25.b4bbb5298a (U.S. public domain)
U.S. Census Bureau TIGERweb, counties (generalised) (U.S. public domain)
Built 2026-10-26. Download every county's answer (JSON)

Every topic for one county: How's Hennepin County?