Washington, DC: September

30 September 2026: September 2026 averaged 73.5°F in Washington, DC, the warmest September since 2019, 21st warmest of 155.

September 2026

Mean temperature: 73.5°F; Warmest since 2019; 21st warmest of 155
Precipitation: 4.26 in; Wettest since 2020; 46th wettest of 156

A normal September in Washington, DC (1991 to 2020): a mean temperature of 71.3°F, between 69.2°F and 75.5°F in eight years of ten and 3.50 in of precipitation, between 1.06 in and 7.90 in in eight years of ten.

The mean temperature of every September in Washington, DC since 1872: 73.5°F in 2026; the highest is 78.2°F, in 1881.

Normal range, 69.2 to 75.5°F

Every year, ranked, as a table

Every September in Washington, DC from 1871 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	73.5	21	81	39	66	9	4.26	46	0
2025	72.2	40	80.5	45	64	34	3.72	59	0
2024	72.5	36	79.7	62	65.3	16	2.31	102	0
2023	73.4	22	81.6	33	65.1	18	3.60	63	0
2022	72.7	33	81.6	33	63.8	36	2.27	103	0
2021	73.2	24	81.7	31	64.7	23	4.03	52	0
2020	70.2	79	78	100	62.4	59	5.53	30	0
2019	76.5	3	85.7	4	67.3	5	0.25	153	0
2018	75.5	6	81.8	29	69.1	1	9.73	5	0
2017	72.5	36	80.8	41	64.2	28	1.43	129	0
2016	76	5	83.4	14	68.6	2	2.50	97	0
2015	74.9	11	83.5	12	66.2	7	2.15	105	0
2014	73.8	18	81.8	29	65.8	11	1.11	137	0
2013	71.3	52	80.9	40	61.7	69	1.22	135	0
2012	72.2	40	80.7	42	63.7	37	4.29	43	0
2011	71.3	52	77.6	110	64.9	21	8.84	6	0
2010	75.5	6	85.4	5	65.6	12	6.02	27	0
2009	70.2	79	77.9	102	62.5	57	3.31	72	0
2008	74	16	81.9	27	66	9	6.41	23	0
2007	72.9	28	82.3	22	63.5	38	0.60	148	0
2006	67.8	117	74.9	141	60.7	92	6.31	24	0
2005	75	9	84.7	8	65.3	16	0.11	156	0
2004	71.6	47	79.1	80	64.1	31	3.99	53	0
2003	70.5	67	77.8	104	63.1	45	6.87	15	0
2002	73	26	81.7	31	64.3	27	2.10	109	0
2001	68.9	105	77.8	104	60	99	1.41	130	0
2000	67.6	120	75.5	137	59.7	106	4.91	36	0
1999	70	87	77.7	107	62.3	60	10.27	4	0
1998	75.4	8	85.2	6	65.6	12	1.83	117	0
1997	70.4	70	79.8	58	61.1	76	1.59	123	0
1996	70.5	67	78.2	94	62.9	48	7.79	11	0
1995	70.9	61	79.9	56	62	63	3.73	58	0
1994	70.2	79	79.3	75	61.1	76	2.84	85	0
1993	70.9	61	79.1	80	62.8	51	3.68	61	0
1992	69.2	101	77	119	61.3	73	3.49	67	0
1991	71	56	79.9	56	62	63	3.50	66	0
1990	69.6	94	78.1	95	61.1	76	0.87	142	0
1989	71.4	51	79.5	70	63.2	42	6.68	20	0
1988	68.9	105	77.9	102	59.9	101	1.85	116	0
1987	72	42	80.1	54	64	34	5.11	33	0
1986	70.9	61	79.1	80	62.7	53	0.60	148	0
1985	71.9	44	81.6	33	62.1	62	6.67	21	0
1984	68.3	112	76.6	124	59.9	101	2.51	96	0
1983	72.6	34	82.2	23	63	47	2.90	82	0
1982	70.6	65	79.2	78	62	63	1.71	121	0
1981	71	56	79.3	75	62.7	53	1.94	114	0
1980	77.1	2	86.3	3	67.9	4	1.90	115	0
1979	71.6	47	78.4	89	64.7	23	6.64	22	0
1978	73.6	20	82	26	65.1	18	1.01	140	0
1977	73.9	17	81.5	36	66.3	6	0.32	152	0
1976	70.3	74	79.8	58	60.9	86	7.23	12	0
1975	68.5	111	76	134	61	83	12.36	2	0
1974	70.2	79	79.4	73	61	83	4.39	40	0
1973	74.3	14	83.1	16	65.4	15	1.58	124	0
1972	71	56	79.7	62	62.2	61	1.27	134	0
1971	73	26	80.5	45	65.5	14	2.48	98	0
1970	75	9	85.2	6	64.7	23	1.57	125	0
1969	70.1	84	79.4	73	60.8	89	5.07	34	0
1968	72	42	83	18	61	83	2.97	81	0
1967	67.9	116	78.6	87	57.3	134	0.20	154	0
1966	68.6	109	77.3	116	59.8	105	6.87	15	0
1965	72.6	34	81.9	27	63.2	42	2.12	108	0
1964	69.9	88	80.5	45	59.3	113	3.07	79	0
1963	66.5	138	76.6	124	56.3	144	3.61	62	0
1962	66.9	130	75.6	136	58.3	122	2.64	91	0
1961	74.8	12	83.5	12	66.1	8	1.02	139	0
1960	71.3	52	79.2	78	63.3	40	4.17	49	0
1959	73.1	25	82.1	24	64.2	28	2.05	110	0
1958	69.1	102	78.4	89	59.7	106	2.57	94	0
1957	71.9	44	79.6	67	64.1	31	3.57	64	0
1956	66.6	135	75	140	58.2	123	3.70	60	0
1955	69.9	88	76.9	122	62.8	51	0.65	146	0
1954	73.3	23	83.6	11	62.9	48	0.63	147	0
1953	69.7	92	79.8	58	59.6	111	4.07	50	0
1952	68.9	105	78.8	85	59	118	4.06	51	0
1951	70.3	74	79.5	70	61.1	76	2.67	90	0
1950	66.9	130	74.1	149	59.7	106	6.73	19	0
1949	67.1	128	76.1	130	58.1	124	3.49	67	0
1948	69.4	96	78.8	85	60	99	3.19	74	0
1947	69.8	91	77.7	107	61.8	67	4.70	37	0
1946	70.4	70	79.6	67	61.1	76	2.72	88	0
1945	72.8	30	80.6	43	64.9	21	3.93	54	0
1944	70.5	67	78.4	89	62.6	56	5.77	29	0
1943	67.6	120	77.6	110	57.6	128	2.88	83	0
1942	70.4	70	79.7	62	61.2	74	2.60	93	0
1941	72.8	30	83	18	62.5	57	0.53	151	0
1940	66.9	130	76.3	127	57.4	131	1.34	132	0
1939	71	56	80.3	49	61.7	69	6.90	14	0
1938	67.4	123	74.8	142	59.9	101	4.27	45	0
1937	65.9	143	75.4	138	56.4	143	1.76	120	0
1936	71.5	49	80.2	52	62.7	53	1.98	112	0
1935	67	129	75.9	135	58.1	124	8.08	7	0
1934	70.6	65	78.1	95	63.1	45	17.45	1	0
1933	71.8	46	80.3	49	63.3	40	2.62	92	0
1932	70.3	74	80.2	52	60.4	96	4.24	47	0
1931	74.1	15	84.1	9	64.1	31	2.79	86	0
1930	76.1	4	87	2	65.1	18	0.76	143	0
1929	70.2	79	80.6	43	59.7	106	4.32	42	0
1928	64.9	149	72.9	152	56.9	138	4.29	43	0
1927	70.1	84	80.3	49	59.9	101	1.19	136	0
1926	69	104	77.1	118	60.9	86	6.80	18	0
1925	72.8	30	82.1	24	63.5	38	3.05	80	0
1924	64.3	153	73.2	151	55.4	148	7.86	8	0
1923	69.7	92	78.4	89	60.9	86	3.15	76	0
1922	69.9	88	79.7	62	60.1	97	6.27	25	0
1921	74.4	13	84	10	64.7	23	3.29	73	0
1920	68.8	108	78.1	95	59.4	112	2.87	84	0
1919	69.4	96	79.5	70	59.3	113	1.77	119	0
1918	64.3	153	74.8	142	53.7	155	2.79	86	0
1917	63.9	155	72.9	152	54.8	153	1.34	132	0
1916	66.6	135	77.7	107	55.4	148	2.57	94	0
1915	70.9	61	81.3	38	60.6	93	1.39	131	0
1914	66	141	77	119	54.9	152	0.66	145	0
1913	67.4	123	76.8	123	58.1	124	2.41	100	0
1912	70.4	70	79	84	61.8	67	5.86	28	0
1911	70.3	74	79.6	67	61.1	76	2.03	111	0
1910	71.1	55	80.4	48	61.7	69	2.15	105	0
1909	66.4	139	76.1	130	56.7	142	3.42	70	0
1908	66.7	134	77	119	56.3	144	4.65	38	0
1907	69.4	96	78.3	93	60.5	95	7.15	13	0
1906	72.9	28	82.6	21	63.2	42	0.60	148	0
1905	68.3	112	78.1	95	58.4	120	2.34	101	0
1904	67.4	123	77.2	117	57.6	128	5.34	31	0
1903	67.2	127	77.4	113	56.9	138	0.74	144	0
1902	66.9	130	76.3	127	57.4	131	5.30	32	0
1901	67.4	123	77.4	113	57.3	134	1.61	122	0
1900	73.7	19	83.1	16	64.2	28	4.61	39	0
1899	65.9	143	76.4	126	55.3	150	6.14	26	0
1898	71	56	81.4	37	60.6	93	0.89	141	0
1897	68.3	112	79.7	62	56.8	140	1.54	127	0
1896	67.8	117	78.1	95	57.6	128	3.18	75	0
1895	72.5	36	83	18	61.9	66	1.11	137	0
1894	71.5	49	80	55	62.9	48	1.53	128	0
1893	66	141	74.8	142	57.2	136	3.91	56	0
1892	66.1	140	76.2	129	56	147	3.55	65	0
1891	70.3	74	79.8	58	60.8	89	3.12	77	0
1890	67.7	119	76.1	130	59.3	113	4.22	48	0
1889	65.6	145	73.4	150	57.9	127	3.88	57	0
1888	64.7	150	72	155	57.4	131	6.82	17	0
1887	65.6	145	74.3	146	56.8	140	3.12	77	0
1886	69.3	99	78.5	88	60.1	97	1.79	118	0
1885	66.6	135	76.1	130	57.1	137	2.15	105	0
1884	72.4	39	83.3	15	61.5	72	0.14	155	0
1883	65.5	147	74.7	145	56.2	146	4.33	41	0
1882	69.5	95	77.8	104	61.2	74	7.84	9	0
1881	78.2	1	88.2	1	68.2	3	2.19	104	0
1880	68.6	109	78	100	59.2	117	3.42	70	0
1879	64.6	151	74.3	146	54.8	153	1.56	126	0
1878	69.1	102	77.4	113	60.8	89	2.46	99	0
1877	67.5	122	75.4	138	59.7	106	4.93	35	0
1876	65.4	148	72.4	154	58.4	120	10.81	3	0
1875	64.6	151	74.2	148	55	151	1.98	112	0
1874	70.1	84	79.1	80	61.1	76	7.84	9	0
1873	68.3	112	77.6	110	59	118	3.48	69	0
1872	69.3	99	79.3	75	59.3	113	3.92	55	0
1871							2.70	89	30

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1881	78.2
1980	77.1
2019	76.5
1930	76.1
2016	76
2018	75.5
2010	75.5
1998	75.4
2005	75
1970	75

Coldest
Year	Mean, °F
1917	63.9
1924	64.3
1918	64.3
1879	64.6
1875	64.6
1888	64.7
1928	64.9
1876	65.4
1883	65.5
1889	65.6
More years share the last value

Wettest
Year	Precipitation, in
1934	17.45
1975	12.36
1876	10.81
1999	10.27
2018	9.73
2011	8.84
1935	8.08
1924	7.86
1882	7.84
1874	7.84

Driest
Year	Precipitation, in
2005	0.11
1884	0.14
1967	0.20
2019	0.25
1977	0.32
1941	0.53
2007	0.60
1986	0.60
1906	0.60
1954	0.63

The hottest, coldest and wettest days

Hottest day: 98°F; 1 September 2026
Coldest night: 53°F; 24 September 2026
Wettest day: 1.25 in; 3 September 2026

Every month, season and year

Months

Seasons

Years

Washington, DC the day's answers

All-time records

Every answer in words

September 2026 brought 4.26 in of precipitation in Washington, DC, the wettest September since 2020, 46th wettest of 156.
The hottest day of September 2026 in Washington, DC: 98°F on Tuesday 1 September 2026.
The coldest night of September 2026 in Washington, DC: a low of 53°F on Thursday 24 September 2026.
The wettest day of September 2026 in Washington, DC: 1.25 in on Thursday 3 September 2026.