Rapid City Downtown, SD: September

30 September 2026: September 2026 averaged 67.5°F in Rapid City Downtown, SD, the warmest September since 2024, 8th warmest of 115.

September 2026

Mean temperature: 67.5°F; Warmest since 2024; 8th warmest of 115
Precipitation: 1.57 in; Wettest since 2019; 34th wettest of 115

The mean temperature of every September in Rapid City Downtown, SD since 1888: 67.5°F in 2026; the highest is 71.3°F, in 2024.

Every year, ranked, as a table

Every September in Rapid City Downtown, SD from 1888 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	Days missing
2026	67.5	8	77.6	29	57.5	1	1.57	34	0
2025	67.2	10	79.3	11	55.1	5	1.52	35	0
2024	71.3	1	85.9	1	56.8	2	0.84	73	0
2023	66.3	14	77.7	28	54.9	6	1.29	45	0
2022	68.2	3	80.3	6	56	3	0.69	83	0
2021	67.6	6	80.6	5	54.5	11	1.01	57	0
2020	62.6	49	74.7	55	50.4	44	1.22	49	0
2019	63.1	40	74.1	64	52.1	21	2.34	14	0
2018	61.2	63	71.6	91	50.9	35	1.07	56	0
2017	62.5	51	73.4	70	51.6	25	1.62	32	0
2016	63	42	73.8	67	52.2	19	0.87	70	0
2015	67	11	79.2	13	54.9	6	0.33	100	0
2014	61.2	63	72.2	86	50.1	47	4.82	3	0
2013	66.6	12	78.5	18	54.8	9	0.95	62	0
2012	66.2	15	79.3	11	53.1	17	0.03	114	0
2011	62.6	49	74.6	56	50.6	39	0.81	76	0
2010	61	67	73.7	68	48.3	68	1.52	35	1
2009	63.5	35	75.7	44	51.2	33	1.62	32	0
2008	60.9	69	72.3	83	49.5	54	1.30	43	0
2007	63.3	39	75.9	39	50.7	37	0.52	92	0
2006	57.3	101	67	111	47.7	74	2.09	18	0
2005	65.1	20	78.1	22	52.2	19	0.65	86	0
2004	62.3	54	73.4	70	51.1	34	2.34	14	0
2003	60.6	73	72.2	86	48.8	61	1.44	39	1
2002	61.7	58	73	76	50.5	43	2.57	10	0
2001	62.4	53	74.2	61	50.6	39	0.68	84	0
2000	64.1	31	76.7	33	51.5	28	0.87	70	0
1999	57.1	103	68.3	106	45.9	100	1.41	40	0
1998	67.8	4	80	9	55.6	4	2.55	11	0
1997	64.2	28	75.1	50	53.2	15	1.11	54	0
1996	58.7	97	68.9	102	48.4	66	2.41	12	0
1971	59.7	84	72.8	78	46.6	90	2.26	17	0
1970	62	56	75.2	49	48.8	61	1.72	28	0
1969	66.1	16	80.3	6	51.9	22	0.54	91	0
1968	61.7	58	75.3	47	48.2	69	0.83	74	0
1967	64.1	31	76.5	36	51.6	25	1.50	38	0
1966	62.8	44	75	51	50.7	37	2.66	8	0
1965	50.5	115	60.6	115	40.4	115	1.52	35	0
1964	60.2	79	74.2	61	46.2	95	0.99	58	0
1963	67.3	9	79.7	10	54.9	6	1.78	26	0
1962	61.6	61	75.8	40	47.5	78	0.72	82	0
1961	55.9	110	68.8	103	43.1	112	0.97	61	0
1960	64.7	23	77.8	27	51.6	25	0.74	81	0
1959	59.5	88	72.1	89	46.9	85	2.86	5	0
1958	64.2	28	78.9	16	49.5	54	0.07	110	0
1957	59.8	83	72.7	79	46.9	85	0.64	88	0
1956	64	33	77.9	25	50	48	0.47	93	0
1955	62.7	47	75.7	44	49.6	51	2.39	13	0
1954	63.1	40	75.8	40	50.4	44	0.07	110	0
1953	63.7	34	77.9	25	49.4	57	0.23	103	0
1952	67.6	6	82	3	53.2	15	0.12	106	0
1951	57	104	68.8	103	45.6	103	2.07	20	1
1950	59	92	70.3	97	47.6	76	1.34	41	0
1949	59.4	90	73.3	74	45.5	104	1.14	53	0
1948	66.1	16	80.2	8	51.9	22	0.94	65	0
1947	62.8	44	75.8	40	49.9	49	0.58	89	0
1946	60.4	76	72.5	81	48.4	66	3.84	4	0
1945	58.2	98	69.6	99	46.7	87	1.64	31	0
1944	61.1	66	74.1	64	48.1	70	0.26	101	0
1943	60.6	73	74.4	59	46.7	87	0.43	94	0
1942	58	100	69.5	100	46.4	91	1.19	51	0
1941	58.8	95	71	93	46.7	87	1.09	55	0
1940	66.5	13	78.8	17	54.3	12	1.27	47	0
1939	65.3	19	79.2	13	51.4	31	0.80	77	0
1938	65.9	18	78.1	22	53.7	14	1.29	45	0
1937	64.2	28	76.6	35	51.9	22	0.67	85	0
1936	64.8	22	77.2	31	52.3	18	0.56	90	0
1935	63.4	37	76.9	32	49.9	49	0.12	106	0
1934	55.6	111	69.4	101	41.8	114	0.38	97	0
1933	64.7	23	78.1	22	51.3	32	0.11	108	0
1932	61	67	74.6	56	47.4	79	0.25	102	0
1931	67.7	5	81.1	4	54.2	13	0.22	104	0
1930	60.9	69	74.6	56	47.2	82	0.76	78	0
1929	54.2	113	64.3	113	44.1	109	1.80	23	0
1928	58.9	94	71.7	90	46.2	95	1.72	28	0
1927	58.8	95	70.4	96	47.3	81	1.80	23	0
1926	56.8	106	70.3	97	43.3	111	0.90	68	0
1925	61.7	58	72.7	79	50.6	39	0.95	62	0
1924	59	92	72.3	83	45.7	101	0.91	67	0
1923	60.5	75	72.4	82	48.6	65	4.90	2	0
1922	64.4	25	79.2	13	49.6	51	0.75	79	0
1921	59.5	88	73	76	46	97	0.95	62	0
1920	60.4	76	73.3	74	47.6	76	0.99	58	0
1919	63	42	75	51	50.9	35	2.27	16	0
1918	56.7	107	67.4	109	46	97	2.06	21	0
1917	60.4	76	74.4	59	46.4	91	0.99	58	0
1916	59.7	84	73.9	66	45.4	105	0.07	110	0
1915	57.3	101	68.3	106	46.3	93	1.84	22	0
1914	63.5	35	77.3	30	49.6	51	1.22	49	0
1913	60.1	81	72.2	86	48	72	5.07	1	0
1912	52.7	114	63.1	114	42.4	113	0.90	68	0
1911	60.9	69	72.3	83	49.5	54	0.92	66	0
1910	59.6	87	71.3	92	47.9	73	1.79	25	0
1909	61.5	62	75	51	48.1	70	1.66	30	0
1908	64.9	21	78.3	20	51.5	28	2.67	7	0
1907	56.6	109	68.4	105	44.8	108	1.75	27	0
1906	63.4	37	75.3	47	51.5	28	1.16	52	0
1905	62.5	51	75.8	40	49.1	60	0.85	72	0
1904	60.7	72	74.2	61	47.1	83	0.43	94	0
1903	55	112	66.2	112	43.8	110	2.79	6	0
1902	59.2	91	73.4	70	45.1	107	0.43	94	0
1901	57	104	68.1	108	46	97	1.30	43	0
1900	60	82	70.8	95	49.2	59	2.09	18	0
1899	62.8	44	76.3	37	49.3	58	0.83	74	0
1898	61.2	63	74.8	54	47.7	74	1.27	47	0
1897	68.8	2	82.9	2	54.6	10	0.08	109	0
1896	56.7	107	67.1	110	46.3	93	2.58	9	0
1895	62.2	55	75.7	44	48.7	64	0.36	99	0
1894	60.2	79	73.4	70	47	84	0.65	86	0
1893	62.7	47	76.7	33	48.8	61	0.06	113	0
1892	64.4	25	78.5	18	50.2	46	0.13	105	0
1891	64.4	25	78.2	21	50.6	39	1.32	42	0
1890	59.7	84	73.7	68	45.7	101	0.75	79	0
1889	58.2	98	70.9	94	45.4	105	0.37	98	0
1888	61.9	57	76.3	37	47.4	79	0.02	115	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2024	71.3
1897	68.8
2022	68.2
1998	67.8
1931	67.7
2021	67.6
1952	67.6
2026	67.5
1963	67.3
2025	67.2

Coldest
Year	Mean, °F
1965	50.5
1912	52.7
1929	54.2
1903	55
1934	55.6
1961	55.9
1907	56.6
1918	56.7
1896	56.7
1926	56.8

Wettest
Year	Precipitation, in
1913	5.07
1923	4.90
2014	4.82
1946	3.84
1959	2.86
1903	2.79
1908	2.67
1966	2.66
1896	2.58
2002	2.57

Driest
Year	Precipitation, in
1888	0.02
2012	0.03
1893	0.06
1958	0.07
1954	0.07
1916	0.07
1897	0.08
1933	0.11
1952	0.12
1935	0.12

The hottest, coldest and wettest days

Hottest day: 95°F; 4 September 2026, 2 September 2026
Coldest night: 48°F; 15 September 2026
Wettest day: 0.75 in; 20 September 2026

Every month, season and year

Months

Seasons

Years

Rapid City Downtown, SD the day's answers

All-time records

Every answer in words

September 2026 brought 1.57 in of precipitation in Rapid City Downtown, SD, the wettest September since 2019, 34th wettest of 115.
The hottest day of September 2026 in Rapid City Downtown, SD: 95°F on Friday 4 September 2026 and Wednesday 2 September 2026.
The coldest night of September 2026 in Rapid City Downtown, SD: a low of 48°F on Tuesday 15 September 2026.
The wettest day of September 2026 in Rapid City Downtown, SD: 0.75 in on Sunday 20 September 2026.