Rapid City, SD: September

30 September 2026: September 2026 averaged 66.2°F in Rapid City, SD, the warmest September since 2025, tied 8th warmest of 85 (with 1978).

September 2026

Mean temperature: 66.2°F; Warmest since 2025; 8th warmest of 85
Precipitation: 1.53 in; Wettest since 2019; 25th wettest of 85

A normal September in Rapid City, SD (1991 to 2020): a mean temperature of 61.7°F, between 58.9°F and 65.3°F in eight years of ten and 1.01 in of precipitation, between 0.40 in and 2.08 in in eight years of ten.

The mean temperature of every September in Rapid City, SD since 1942: 66.2°F in 2026; the highest is 70°F, in 2024.

Normal range, 58.9 to 65.3°F

Every year, ranked, as a table

Every September in Rapid City, SD from 1942 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	66.2	8	78.8	24	53.5	1	1.53	25	0
2025	66.5	5	82.3	5	50.6	9	1.05	38	0
2024	70	1	87.8	1	52.1	3	1.18	34	0
2023	64.5	18	79.8	18	49.1	18	0.99	40	0
2022	65.4	12	81.7	9	49.1	18	0.39	67	0
2021	65.1	15	81.2	11	48.9	20	0.71	53	0
2020	59.9	57	76.2	39	43.6	73	1.11	37	0
2019	61.8	38	75.3	51	48.3	24	2.69	9	0
2018	60.2	52	72.1	68	48.2	28	1.95	19	0
2017	61.1	44	75.6	49	46.7	43	1.14	36	0
2016	61.5	40	75.9	43	47.1	39	0.84	48	0
2015	64.8	16	80.3	16	49.3	16	0.25	76	0
2014	60	54	74.7	58	45.3	57	3.17	2	0
2013	65.8	11	80.9	13	50.7	8	1.18	34	0
2012	63.9	19	81.8	8	45.9	48	0.14	82	0
2011	61.2	43	77.1	33	45.2	58	0.75	51	0
2010	60	54	76.1	40	43.9	71	1.51	26	0
2009	62.6	30	77.6	30	47.5	33	1.90	20	0
2008	59	66	74.6	59	43.4	75	0.87	45	0
2007	63.7	21	78.7	25	48.6	22	0.83	49	0
2006	57.8	73	71.1	72	44.5	67	2.00	18	0
2005	65.3	14	81.9	7	48.7	21	0.57	61	0
2004	62.5	32	75.8	44	49.2	17	2.04	17	0
2003	59.6	61	75	54	44.1	69	1.37	32	0
2002	61.9	37	75.8	44	48	29	2.45	11	0
2001	62.5	32	77.6	30	47.4	34	0.91	42	0
2000	63.4	24	79.9	17	46.8	42	0.45	64	0
1999	55.6	82	70.8	76	40.5	84	0.85	47	0
1998	67	3	82.1	6	52	4	1.50	27	0
1997	62.5	32	77	34	48	29	0.78	50	0
1996	59.8	58	72.1	68	47.4	34	1.55	24	0
1995	60	54	75.1	53	45	61	0.86	46	0
1994	65.4	12	80.5	15	50.4	10	0.27	75	0
1993	56.6	79	70.4	79	42.8	80	1.46	28	0
1992	62.6	30	79.4	20	45.7	51	0.42	65	0
1991	61.1	44	76.7	38	45.5	54	0.59	59	0
1990	65.9	10	80.8	14	51	7	2.44	12	0
1989	61	46	75.7	46	46.3	44	3.09	4	0
1988	60.4	50	75.3	51	45.4	55	0.56	62	0
1987	61.4	41	77.8	28	44.9	63	0.68	56	0
1986	54.9	84	64.7	84	45.2	58	3.14	3	0
1985	56.1	80	68.4	83	43.2	77	1.57	22	1
1984	57.2	77	71	73	43.3	76	0.74	52	0
1983	60.8	48	75.7	46	45.8	49	0.33	70	0
1982	58.7	70	71	73	46.3	44	2.69	9	0
1981	63.5	23	78.7	25	48.3	24	0.16	81	0
1980	61.6	39	76.9	35	46.3	44	0.48	63	0
1979	66.3	7	82.9	2	49.6	13	0.07	83	0
1978	66.2	8	82.4	4	50	11	0.18	80	0
1977	61	46	74.9	55	47	40	2.86	6	0
1976	63.3	26	79.3	21	47.2	36	0.28	74	0
1975	58.5	71	74	62	43	79	0.03	84	0
1974	57.6	74	72.8	67	42.4	82	0.88	44	0
1973	57.1	78	69.4	80	44.8	64	1.44	31	0
1972	59.4	62	76	42	42.7	81	0.24	77	0
1971	57.4	75	71.3	71	43.5	74	2.32	14	0
1970	59.1	65	74	62	44.1	69	1.57	22	0
1969	64.8	16	81.2	11	48.3	24	0.35	69	0
1968	59.8	58	74.9	55	44.6	66	0.89	43	0
1967	63.4	24	76.9	35	49.8	12	2.10	16	0
1966	61.3	42	74.6	59	48	29	2.84	7	0
1965	49.7	85	60.6	85	38.8	85	1.46	28	0
1964	59	66	73.7	64	44.3	68	0.69	54	0
1963	66.5	5	79.8	18	53.1	2	1.21	33	0
1962	60.2	52	74.8	57	45.7	51	0.67	58	0
1961	55.6	82	69	81	42.2	83	0.98	41	0
1960	63.6	22	77.8	28	49.4	14	0.68	56	0
1959	58.8	69	71.9	70	45.7	51	2.37	13	0
1958	63.8	20	79.3	21	48.3	24	0.03	84	0
1957	59.2	64	73.1	65	45.2	58	0.69	54	0
1956	63	29	78	27	47.9	32	0.30	73	0
1955	62.2	35	75.7	46	48.6	22	3.08	5	0
1954	63.2	27	76.9	35	49.4	14	0.20	79	0
1953	63.1	28	79.1	23	47.2	36	0.37	68	0
1952	67.1	2	82.6	3	51.7	6	0.21	78	0
1951	55.8	81	68.5	82	43.1	78	1.46	28	0
1950	59	66	70.8	76	47.2	36	2.79	8	0
1949	59.7	60	74.4	61	45	61	1.05	38	0
1948	66.6	4	81.3	10	51.9	5	0.59	59	0
1947	62.1	36	77.3	32	46.9	41	0.31	72	0
1946	59.4	62	73	66	45.8	49	3.94	1	0
1945	58	72	70.5	78	45.4	55	2.12	15	0
1944	60.8	48	75.5	50	46.1	47	0.40	66	0
1943	60.4	50	76.1	40	44.7	65	0.32	71	0
1942	57.3	76	70.9	75	43.8	72	1.74	21	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2024	70
1952	67.1
1998	67
1948	66.6
2025	66.5
1963	66.5
1979	66.3
2026	66.2
1978	66.2
1990	65.9

Coldest
Year	Mean, °F
1965	49.7
1986	54.9
1999	55.6
1961	55.6
1951	55.8
1985	56.1
1993	56.6
1973	57.1
1984	57.2
1942	57.3

Wettest
Year	Precipitation, in
1946	3.94
2014	3.17
1986	3.14
1989	3.09
1955	3.08
1977	2.86
1966	2.84
1950	2.79
2019	2.69
1982	2.69

Driest
Year	Precipitation, in
1975	0.03
1958	0.03
1979	0.07
2012	0.14
1981	0.16
1978	0.18
1954	0.20
1952	0.21
1972	0.24
2015	0.25

The hottest, coldest and wettest days

Hottest day: 97°F; 4 September 2026
Coldest night: 41°F; 15 September 2026
Wettest day: 0.64 in; 20 September 2026

Every month, season and year

Months

Seasons

Years

Rapid City, SD the day's answers

All-time records

Every answer in words

September 2026 brought 1.53 in of precipitation in Rapid City, SD, the wettest September since 2019, 25th wettest of 85.
The hottest day of September 2026 in Rapid City, SD: 97°F on Friday 4 September 2026.
The coldest night of September 2026 in Rapid City, SD: a low of 41°F on Tuesday 15 September 2026.
The wettest day of September 2026 in Rapid City, SD: 0.64 in on Sunday 20 September 2026.