Boston, MA: September

30 September 2026: September 2026 averaged 64.6°F in Boston, MA, the warmest September since 2025, tied 72nd warmest of 154 (with 2006, 1990, 1988 and 2 other years).

September 2026

Mean temperature: 64.6°F; Warmest since 2025; 72nd warmest of 154
Precipitation: 5.35 in; Wettest since 2021; 29th wettest of 155

A normal September in Boston, MA (1991 to 2020): a mean temperature of 65.4°F, between 63.7°F and 68.4°F in eight years of ten and 3.24 in of precipitation, between 1.34 in and 6.33 in in eight years of ten.

The mean temperature of every September in Boston, MA since 1872: 64.6°F in 2026; the highest is 70.6°F, in 1983.

Normal range, 63.7 to 68.4°F

Every year, ranked, as a table

Every September in Boston, MA from 1872 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	64.6	72	70.6	117	58.6	30	5.35	29	0
2025	66.5	28	73.6	48	59.3	21	3.09	64	0
2024	65.9	35	72.7	66	59	25	1.33	128	0
2023	67.4	17	73.3	54	61.6	4	3.75	51	0
2022	65.2	53	72.2	75	58.2	34	2.60	77	0
2021	69.7	2	76.7	6	62.6	2	7.47	7	0
2020	65.6	42	73.8	41	57.3	53	0.97	140	0
2019	68	11	76	14	60	15	2.16	93	0
2018	69	5	75.2	20	62.8	1	5.12	31	0
2017	67.1	20	74.4	28	59.8	17	3.73	52	0
2016	67.5	15	74.4	28	60.7	7	1.38	127	0
2015	69.2	4	77.4	3	61	6	3.93	48	0
2014	66.2	32	74.2	34	58.3	33	0.70	145	0
2013	64.7	68	73	61	56.3	85	2.21	92	0
2012	64.7	68	71.9	87	57.5	51	4.10	44	0
2011	67.3	18	74.3	32	60.3	11	4.40	43	0
2010	68.7	7	76.6	7	60.7	7	1.80	112	0
2009	63.2	108	70.4	121	56	94	3.09	64	0
2008	65.3	48	71.5	94	59	25	6.45	16	0
2007	67.6	14	76.1	11	59.2	22	1.81	110	0
2006	64.6	72	71.8	89	57.3	53	1.72	115	0
2005	67.9	12	75.7	18	60.1	13	1.78	114	0
2004	65.2	53	72.7	66	57.7	41	7.44	8	0
2003	65.7	39	72	81	59.4	20	2.65	74	0
2002	68.4	9	76.1	11	60.6	9	3.39	61	0
2001	65.3	48	73.3	54	57.2	59	2.29	90	0
2000	63.5	105	71.6	91	55.4	111	2.87	71	0
1999	67.1	20	74.2	34	59.9	16	9.86	3	0
1998	66.3	29	74.4	28	58.1	36	3.03	67	0
1997	64.2	89	71.9	87	56.5	79	1.02	138	0
1996	64.1	92	70.2	126	58.1	36	6.09	19	0
1995	63.1	112	71.1	105	55.1	123	3.60	56	0
1994	64.2	89	71.4	96	57	64	4.58	39	0
1993	64.8	67	72.2	75	57.4	52	4.64	36	0
1992	63.9	96	71.7	90	56	94	3.46	58	0
1991	63.7	99	71.6	91	55.7	108	6.32	18	0
1990	64.6	72	72.3	72	56.9	69	1.67	117	0
1989	64.7	68	72.3	72	57.1	62	4.61	38	0
1988	64.6	72	73.3	54	55.9	99	1.29	130	0
1987	65.4	45	72.6	70	58.2	34	7.29	10	0
1986	63.2	108	71.4	96	55	124	1.08	135	0
1985	65.4	45	73.2	58	57.6	46	3.00	68	0
1984	62.1	135	71.4	96	52.7	147	1.22	131	0
1983	70.6	1	79.5	1	61.7	3	1.06	137	0
1982	64	94	71.2	103	56.9	69	1.57	120	0
1981	63.6	104	71.5	94	55.8	103	2.54	79	0
1980	66.9	23	75.8	16	58.1	36	0.82	143	0
1979	64.9	62	72.8	64	57	64	3.61	55	0
1978	61.4	143	70	128	52.8	145	1.30	129	0
1977	64.4	82	71.1	105	57.7	41	4.03	46	0
1976	64.9	62	73.8	41	55.9	99	1.56	121	0
1975	63.9	96	71.2	103	56.5	79	5.49	26	0
1974	63.7	99	70.8	111	56.5	79	7.03	12	0
1973	64.4	82	72.3	72	56.4	84	1.95	103	0
1972	65.7	39	73.7	46	57.7	41	5.94	22	0
1971	67.9	12	75.4	19	60.5	10	1.55	122	0
1970	65.6	42	73.9	40	57.3	53	2.60	77	0
1969	63.7	99	70.9	110	56.5	79	4.42	42	0
1968	64.9	62	70.7	115	59.2	22	1.79	113	0
1967	62.7	122	71	108	54.3	131	2.00	100	0
1966	63.5	105	70.8	111	56.2	87	3.42	60	0
1965	62.5	126	69.8	137	55.2	120	2.01	99	0
1964	62	136	70	128	54	138	2.65	74	0
1963	60.8	146	68.8	146	52.8	145	3.05	66	0
1962	62.9	115	71	108	54.8	127	4.10	44	0
1961	68.9	6	76.8	5	61.1	5	7.04	11	0
1960	63.7	99	70.5	120	56.9	69	5.97	21	0
1959	68.1	10	76.5	9	59.7	18	0.63	149	0
1958	64.6	72	72.9	62	56.3	85	7.50	6	0
1957	67.3	18	75.9	15	58.6	30	0.35	152	0
1956	61.1	144	68.1	150	54.1	136	5.07	34	0
1955	64.5	78	73.1	60	55.8	103	2.40	86	0
1954	63.2	108	70.4	121	55.9	99	8.31	5	0
1953	66.3	29	75	23	57.6	46	2.50	81	0
1952	66.3	29	75	23	57.6	46	1.13	134	0
1951	65.5	44	74.1	36	57	64	2.00	100	0
1950	61.5	141	69.4	140	53.6	140	0.89	142	0
1949	63.2	108	71.1	105	55.3	114	6.47	15	0
1948	65.7	39	75.2	20	56.2	87	0.67	148	0
1947	64.7	68	73.4	50	56.1	92	3.95	47	0
1946	65.9	35	74	37	57.7	41	2.04	98	0
1945	67.1	20	75.8	16	58.4	32	1.81	110	0
1944	65	58	72.7	66	57.3	53	5.36	28	0
1943	62.9	115	70.6	117	55.3	114	1.41	126	0
1942	64.5	78	72.2	75	56.9	69	1.96	102	0
1941	66	34	76.2	10	55.8	103	1.18	133	0
1940	63.3	107	71.3	102	55.3	114	2.32	89	0
1939	64.5	78	73.4	50	55.6	110	1.01	139	0
1938	62.2	132	70.3	124	54.2	133	5.43	27	0
1937	62.9	115	70.6	117	55.3	114	3.69	53	0
1936	62.6	123	70	128	55.2	120	3.79	50	0
1935	61.5	141	69.3	141	53.6	140	2.69	73	0
1934	64.5	78	70.4	121	58.7	28	5.65	24	0
1933	65.8	37	73.5	49	58.1	36	10.94	1	0
1932	65.1	57	73.3	54	57	64	4.43	41	0
1931	66.9	23	75.1	22	58.7	28	1.50	124	0
1930	69.4	3	78.5	2	60.3	11	0.22	154	0
1929	65.3	48	73.8	41	56.7	74	0.76	144	0
1928	62.4	130	69.9	133	54.9	125	4.47	40	0
1927	65	58	73.4	50	56.5	79	2.44	84	0
1926	62.4	130	70	128	54.8	127	1.08	135	0
1925	64.1	92	72.1	80	56	94	3.45	59	0
1924	62.2	132	70	128	54.4	130	6.96	13	0
1923	64.4	82	72	81	56.7	74	0.38	151	2
1922	65.2	53	73.2	58	57.1	62	3.65	54	0
1921	68.5	8	76.9	4	60.1	13	1.22	131	0
1920	65.3	48	72.9	62	57.6	46	1.90	106	0
1919	63.9	96	72	81	55.8	103	5.83	23	0
1918	61.1	144	68.8	146	53.5	142	9.19	4	0
1917	60.3	147	68.1	150	52.4	149	1.91	105	0
1916	65	58	74	37	55.9	99	1.90	106	0
1915	66.8	26	74.4	28	59.2	22	0.69	146	0
1914	64.6	72	73.8	41	55.3	114	0.21	155	0
1913	62	136	69.9	133	54.1	136	2.51	80	0
1912	63.7	99	71.4	96	56	94	1.67	117	0
1911	62.5	126	69.9	133	55.2	120	2.95	69	0
1910	62.8	119	70.3	124	55.3	114	2.14	94	0
1909	62.6	123	69.9	133	55.4	111	5.15	30	0
1908	65.8	37	73.8	41	57.8	40	0.68	147	0
1907	64.4	82	71.6	91	57.3	53	7.43	9	0
1906	65	58	73.4	50	56.6	77	2.64	76	0
1905	62	136	69.1	143	54.9	125	5.10	32	0
1904	62.5	126	70.7	115	54.3	131	5.57	25	0
1903	64.4	82	72.8	64	56	94	2.43	85	0
1902	62.6	123	69	144	56.2	87	2.08	96	0
1901	65.4	45	73.7	46	57.2	59	2.50	81	0
1900	64.9	62	72.2	75	57.6	46	4.62	37	0
1899	62	136	70.2	126	53.7	139	5.09	33	0
1898	66.2	32	75	23	57.3	53	1.93	104	0
1897	63.1	112	72	81	54.2	133	2.38	87	0
1896	62.2	132	69.7	138	54.6	129	6.40	17	0
1895			74.6	26	57	64	1.53	123	4
1894	64.9	62	72	81	57.7	41	2.14	94	0
1893	60	149	67.8	152	52.2	151	1.59	119	0
1892	62.5	126	70.8	111	54.2	133	1.90	106	0
1891	66.7	27	74	37	59.5	19	2.29	90	0
1890	62.9	115	69.6	139	56.2	87	5.04	35	0
1889	62.8	119	69	144	56.7	74	3.19	62	0
1888	59.8	151	66	155	53.5	142	6.77	14	0
1887	59.8	151	67.7	153	51.9	152	0.97	140	0
1886	63.1	112	70.8	111	55.4	111	2.73	72	0
1885	60.1	148	69.2	142	51	154	1.70	116	0
1884	66.9	23	76.6	7	57.2	59	0.31	153	0
1883	59.8	151	68.4	149	51.2	153	1.50	124	0
1882	64	94	71.4	96	56.6	77	10.93	2	0
1881	67.5	15	76.1	11	59	25	2.50	81	0
1880	65.2	53	74.6	26	55.8	103	2.36	88	0
1879	61.9	140	71.4	96	52.4	149	1.84	109	0
1878	64.2	89	72.7	66	55.7	108	3.47	57	0
1877	65.3	48	74.3	32	56.2	87	0.60	150	0
1876	59.9	150	67.2	154	52.6	148	3.84	49	0
1875	59.6	154	68.6	148	50.6	155	3.12	63	0
1874	64.4	82	72	81	56.8	73	2.05	97	0
1873	62.8	119	72.2	75	53.3	144	2.91	70	0
1872	64.4	82	72.6	70	56.1	92	6.04	20	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1983	70.6
2021	69.7
1930	69.4
2015	69.2
2018	69
1961	68.9
2010	68.7
1921	68.5
2002	68.4
1959	68.1

Coldest
Year	Mean, °F
1875	59.6
1888	59.8
1887	59.8
1883	59.8
1876	59.9
1893	60
1885	60.1
1917	60.3
1963	60.8
1956	61.1
More years share the last value

Wettest
Year	Precipitation, in
1933	10.94
1882	10.93
1999	9.86
1918	9.19
1954	8.31
1958	7.50
2021	7.47
2004	7.44
1907	7.43
1987	7.29

Driest
Year	Precipitation, in
1914	0.21
1930	0.22
1884	0.31
1957	0.35
1923	0.38
1877	0.60
1959	0.63
1948	0.67
1908	0.68
1915	0.69

The hottest, coldest and wettest days

Hottest day: 87°F; 10 September 2026
Coldest night: 49°F; 24 September 2026
Wettest day: 1.50 in; 27 September 2026

Every month, season and year

Months

Seasons

Years

Boston, MA the day's answers

All-time records

Every answer in words

September 2026 brought 5.35 in of precipitation in Boston, MA, the wettest September since 2021, 29th wettest of 155.
The hottest day of September 2026 in Boston, MA: 87°F on Thursday 10 September 2026.
The coldest night of September 2026 in Boston, MA: a low of 49°F on Thursday 24 September 2026.
The wettest day of September 2026 in Boston, MA: 1.50 in on Sunday 27 September 2026.