Charleston, SC: September

30 September 2026: September 2026 averaged 78.5°F in Charleston, SC, the warmest September since 2019, 13th warmest of 90.

September 2026

Mean temperature: 78.5°F; Warmest since 2019; 13th warmest of 90
Precipitation: 3.54 in; Driest since 2025; 32nd driest of 90

A normal September in Charleston, SC (1991 to 2020): a mean temperature of 76.8°F, between 75.2°F and 79.2°F in eight years of ten and 5.35 in of precipitation, between 2.01 in and 9.70 in in eight years of ten.

The mean temperature of every September in Charleston, SC since 1937: 78.5°F in 2026; the highest is 81.5°F, in 2018.

Normal range, 75.2 to 79.2°F

Every year, ranked, as a table

Every September in Charleston, SC from 1937 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	78.5	13	88.1	8	68.8	23	3.54	59
2025	75.9	50	85.1	42	66.7	57	0.98	85
2024	77.2	27	84.9	46	69.4	17	3.53	60
2023	77.2	27	86.6	22	67.7	38	7.97	22
2022	76.5	39	84.9	46	68.1	32	7.92	24
2021	76.2	45	85.4	39	66.9	52	7.28	27
2020	76.8	33	84.7	51	68.9	21	7.14	29
2019	79.3	5	88.3	5	70.3	9	6.15	33
2018	81.5	1	89.4	1	73.5	1	1.96	75
2017	77.7	17	86.7	21	68.6	25	6.75	31
2016	79.8	2	88.3	5	71.2	3	12.27	6
2015	77.6	19	85.2	41	69.9	12	2.69	67
2014	78.3	14	85.3	40	71.2	3	8.66	16
2013	77.2	27	86.6	22	67.8	35	5.01	42
2012	76.4	41	86	31	66.7	57	2.02	74
2011	76.7	36	85.8	32	67.7	38	3.60	58
2010	78.8	10	88.2	7	69.3	18	8.12	19
2009	76.6	37	85.5	37	67.7	38	0.48	89
2008	76.2	45	84.5	55	67.8	35	5.68	36
2007	77.5	21	86.3	26	68.6	25	7.29	26
2006	75.5	60	84.6	52	66.4	62	4.31	52
2005	79.2	6	87.6	12	70.7	5	0.97	86
2004	76.4	41	83.5	70	69.2	19	3.71	57
2003	74.6	73	83.1	72	66	68	4.46	51
2002	79	9	86.4	24	71.6	2	4.92	44
2001	73.5	84	82.4	81	64.7	81	4.90	45
2000	75.2	64	83.1	72	67.3	45	8.88	14
1999	74.7	72	84.3	58	65	78	10.81	7
1998	77.3	26	86.2	28	68.4	30	14.74	3
1997	75.9	50	84.8	48	67.1	49	9.58	11
1996	75.4	61	83.8	63	66.9	52	8.77	15
1995	75.6	58	82.9	75	68.3	31	7.98	21
1994	75.6	58	84.4	56	66.9	52	8.08	20
1993	78.3	14	86.8	20	69.8	14	5.01	42
1992	76.2	45	83.9	60	68.5	28	3.04	63
1991	77.4	24	86.2	28	68.5	28	2.29	72
1990	79.2	6	89.4	1	68.9	21	0.18	90
1989	76.6	37	83.6	69	69.6	16	13.35	5
1988	76.3	44	83.9	60	68.7	24	9.72	9
1987	77.7	17	85.7	33	69.8	14	14.49	4
1986	78.6	12	87.2	16	69.9	12	4.60	49
1985	75.8	55	84.8	48	66.7	57	2.53	69
1984	73	86	81.5	87	64.5	82	5.27	39
1983	75.4	61	83.8	63	67.1	49	3.50	61
1982	74.5	75	82.3	83	66.6	60	3.92	55
1981	74.8	71	85.6	36	64	85	1.27	84
1980	79.8	2	89	3	70.6	8	2.60	68
1979	76.5	39	82.3	83	70.7	5	15.36	2
1978	77.4	24	86.1	30	68.6	25	5.06	41
1977	78.7	11	87.2	16	70.1	11	2.48	71
1976	73.9	79	82.8	77	65	78	6.03	34
1975	76.8	33	84.6	52	69	20	5.16	40
1974	75	67	82.8	77	67.2	48	4.80	47
1973	79.6	4	88.4	4	70.7	5	7.93	23
1972	76.4	41	87.1	19	65.7	73	1.82	77
1971	77	32	86.4	24	67.7	38	0.53	88
1970	77.2	27	87.2	16	67.3	45	2.53	69
1969	73.6	83	81.4	89	65.9	70	5.37	38
1968	75.1	65	85.1	42	65	78	1.66	79
1967	69.9	90	80.1	90	59.6	90	1.39	82
1966	75.8	55	84.8	48	66.8	55	2.20	73
1965	75.9	50	84.2	59	67.6	42	4.66	48
1964	75.4	61	85	44	65.8	71	4.11	54
1963	73.8	81	83.8	63	63.8	86	2.75	66
1962	73.9	79	83.7	68	64.1	84	3.81	56
1961	76.8	33	86.3	26	67.3	45	2.97	64
1960	75.9	50	85.7	33	66.1	66	7.60	25
1959	73.8	81	81.5	87	66	68	9.60	10
1958	76	49	85	44	67.1	49	5.54	37
1957	75.9	50	84.4	56	67.4	44	8.44	18
1956	71.9	89	81.8	86	62	88	4.81	46
1955	75	67	82.2	85	67.8	35	8.93	13
1954	77.5	21	87.4	14	67.5	43	1.55	80
1953	75.1	65	83.9	60	66.3	63	6.94	30
1952	74.6	73	83.8	63	65.4	75	7.24	28
1951	75	67	83.8	63	66.2	64	4.28	53
1950	74.3	76	83	74	65.7	73	5.93	35
1949	74.1	77	82.4	81	65.8	71	6.56	32
1948	74	78	82.9	75	65.1	77	9.43	12
1947	76.1	48	85.7	33	66.5	61	9.93	8
1946	74.9	70	84.6	52	65.3	76	1.28	83
1945	79.1	8	87.8	11	70.3	9	17.31	1
1944	77.8	16	87.5	13	68.1	32	2.80	65
1943	72.9	87	82.8	77	62.9	87	0.73	87
1942	77.1	31	87.9	10	66.2	64	3.22	62
1941	77.5	21	88.1	8	66.8	55	1.55	80
1940	72.5	88	83.2	71	61.7	89	1.96	75
1939	77.6	19	87.3	15	67.9	34	1.76	78
1938	75.8	55	85.5	37	66.1	66	8.56	17
1937	73.5	84	82.7	80	64.3	83	4.54	50

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2018	81.5
2016	79.8
1980	79.8
1973	79.6
2019	79.3
2005	79.2
1990	79.2
1945	79.1
2002	79
2010	78.8

Coldest
Year	Mean, °F
1967	69.9
1956	71.9
1940	72.5
1943	72.9
1984	73
2001	73.5
1937	73.5
1969	73.6
1963	73.8
1959	73.8

Wettest
Year	Precipitation, in
1945	17.31
1979	15.36
1998	14.74
1987	14.49
1989	13.35
2016	12.27
1999	10.81
1947	9.93
1988	9.72
1959	9.60

Driest
Year	Precipitation, in
1990	0.18
2009	0.48
1971	0.53
1943	0.73
2005	0.97
2025	0.98
1981	1.27
1946	1.28
1967	1.39
1954	1.55
More years share the last value

The hottest, coldest and wettest days

Hottest day: 95°F; 14 September 2026, 5 September 2026
Coldest night: 51°F; 27 September 2026
Wettest day: 1.81 in; 11 September 2026

Every month, season and year

Months

Seasons

Years

Charleston, SC the day's answers

All-time records

Every answer in words

September 2026 brought 3.54 in of precipitation in Charleston, SC, the driest September since 2025, 32nd driest of 90.
The hottest day of September 2026 in Charleston, SC: 95°F on Monday 14 September 2026 and Saturday 5 September 2026.
The coldest night of September 2026 in Charleston, SC: a low of 51°F on Sunday 27 September 2026.
The wettest day of September 2026 in Charleston, SC: 1.81 in on Friday 11 September 2026.