Williamsport, PA: September

30 September 2026: September 2026 averaged 66.9°F in Williamsport, PA, the warmest September since 2025, tied 18th warmest of 131 (with 1934).

September 2026

Mean temperature: 66.9°F; Warmest since 2025; 18th warmest of 131
Precipitation: 6.84 in; Wettest since 2021; 12th wettest of 131

A normal September in Williamsport, PA (1991 to 2020): a mean temperature of 64.7°F, between 62.1°F and 67.6°F in eight years of ten and 3.70 in of precipitation, between 1.49 in and 9.89 in in eight years of ten.

The mean temperature of every September in Williamsport, PA since 1895: 66.9°F in 2026; the highest is 70.5°F, in 1931.

Normal range, 62.1 to 67.6°F

Every year, ranked, as a table

Every September in Williamsport, PA from 1895 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	66.9	18	76.3	50	57.4	9	6.84	12	0
2025	67.1	17	79.6	12	54.6	44	1.38	114	0
2024	66.1	36	76.6	42	55.7	27	1.11	121	0
2023	66.8	20	76.8	41	56.8	13	2.97	67	0
2022	65.3	44	75	66	55.7	27	4.64	35	0
2021	66.5	30	76.6	42	56.4	18	8.51	7	0
2020	64.9	54	77.2	37	52.6	86	1.59	108	0
2019	66.8	20	77.9	25	55.7	27	1.52	112	0
2018	68.5	6	76.6	42	60.5	2	9.81	5	0
2017	67.5	12	78.7	18	56.3	20	1.24	117	0
2016	68.8	5	81	4	56.6	17	3.51	52	0
2015	68.9	4	79.7	11	58.1	6	3.28	60	0
2014	65.2	48	76.1	55	54.4	49	1.10	122	0
2013	63	91	75.7	59	50.4	112	1.60	107	0
2012	63.8	74	74.2	78	53.4	64	3.88	48	0
2011	66.3	32	74	83	58.6	4	15.97	1	0
2010	65.1	51	76.4	49	53.8	59	6.98	11	0
2009	63.9	72	73.2	96	54.5	45	2.22	85	0
2008	65.2	48	76.3	50	54.2	51	6.80	13	0
2007	66	38	78.3	21	53.6	62	1.63	104	0
2006	61.9	111	70.3	127	53.4	64	5.49	22	0
2005	66.8	20	78.9	16	54.7	40	1.78	100	0
2004	66	38	75.6	61	56.3	20	10.61	3	0
2003	63.8	74	73	98	54.7	40	8.37	8	0
2002	66.8	20	78.8	17	54.7	40	4.64	35	0
2001	61.7	113	72.6	106	50.7	109	4.72	33	0
2000	61.7	113	72.4	108	50.9	107	3.29	59	0
1999	64.5	59	74.2	78	54.8	38	12.60	2	0
1998	66	38	77.8	27	54.3	50	1.53	111	0
1997	62.2	107	72.2	113	52.3	89	3.14	65	0
1996	63.5	84	72.1	115	54.8	38	7.82	9	0
1995	62.1	108	74.6	75	49.7	120	1.17	120	0
1994	62.9	95	74.1	81	51.7	95	4.27	41	0
1993	62.6	101	71.9	121	53.4	64	4.71	34	0
1992	63.7	79	73.9	86	53.4	64	4.16	43	0
1991	62.6	101	74.5	77	50.7	109	3.35	55	0
1990	62.4	104	72	117	52.8	83	1.98	90	0
1989	63.7	79	74	83	53.4	64	4.28	40	0
1988	61.3	119	72.2	113	50.4	112	2.62	76	0
1987	63	91	72.3	109	53.7	60	4.99	28	0
1986	62.9	95	72.7	104	53.1	74	1.78	100	0
1985	65.3	44	76.5	46	54	56	2.58	80	0
1984	60.6	122	71.9	121	49.3	125	0.62	128	0
1983	62	110	74.7	72	49.3	125	1.88	94	0
1982	63	91	72	117	54.1	54	2.59	79	0
1981	64.5	59	72.8	102	56.1	22	2.10	89	0
1980	66.8	20	78.1	22	55.4	33	3.32	58	0
1979	62.8	97	72.6	106	53	79	5.83	20	0
1978	65	52	74.8	69	55.2	34	2.84	71	0
1977	67.2	15	76.2	52	58.1	6	7.30	10	0
1976	62.3	105	73.5	92	51	104	3.21	63	0
1975	59.5	129	68.3	132	50.7	109	10.02	4	0
1974	61.4	117	70.3	127	52.6	86	4.84	29	0
1973	63.6	82	73.9	86	53.2	70	5.50	21	0
1972	63.1	90	73	98	53.1	74	1.61	105	0
1971	68.2	9	75.1	65	61.2	1	3.33	57	0
1970	67.4	13	77.5	33	57.3	10	1.91	92	0
1969	64.2	68	74.2	78	54.2	51	1.81	99	0
1968	64.5	59	76.9	40	52.1	90	6.41	14	0
1967	63.3	88	75.3	63	51.3	101	2.20	86	0
1966	59.4	130	69.3	130	49.4	124	5.22	26	0
1965	63.4	85	73.2	96	53.5	63	4.04	45	0
1964	64.5	59	77.8	27	51.1	103	0.50	129	0
1963	59.7	128	72.8	102	46.6	131	2.29	84	0
1962	59.3	131	69.3	130	49.3	125	3.25	62	0
1961	69.9	3	81	4	58.9	3	0.89	125	0
1960	64.9	54	74.1	81	55.6	30	6.35	15	0
1959	67.3	14	79	14	55.5	32	4.09	44	0
1958	62.8	97	73	98	52.6	86	4.04	45	0
1957	64.5	59	75.9	58	53	79	3.80	50	0
1956	60.5	123	70.8	125	50.2	116	2.60	77	0
1955	63.8	74	74.6	75	52.9	81	2.63	75	0
1954	64.9	54	76.1	55	53.7	60	1.59	108	0
1953	64.5	59	77.3	34	51.7	95	1.77	102	0
1952	64.1	70	77	39	51.2	102	1.98	90	0
1951	63.4	85	75.3	63	51.6	98	1.88	94	0
1950	60.7	121	69.6	129	51.8	93	1.84	96	0
1949	60.3	125	70.9	124	49.7	120	4.62	37	0
1948	64	71	77.1	38	50.9	107	1.23	118	0
1947	64.4	66	75.6	61	53.1	74	2.38	82	0
1946	64.8	58	77.9	25	51.8	93	5.32	24	0
1945	65.3	44	74.8	69	55.8	26	6.35	15	0
1944	64.9	54	76.6	42	53.2	70	4.83	30	0
1943	62.8	97	78.5	19	47	130	0.16	131	0
1942	65.5	41	77.8	27	53.2	70	4.33	39	1
1941	64.5	59	80.6	8	48.5	128	1.54	110	0
1940	61.1	120	72.3	109	50	117	2.85	70	1
1939	63.7	79	74.7	72	53.1	74	2.76	72	1
1938	61.4	117	72.3	109	50.4	112	3.35	55	0
1937	61.7	113	73.3	94	50	117	1.27	116	0
1936	66.3	32	78.1	22	54.5	45	1.20	119	0
1935			73.5	92			2.31	83	5
1934	66.9	18	76.5	46	57.2	11	8.88	6	0
1933	66.1	36	76.5	46	55.6	30	6.27	17	0
1932	66.2	34	80.9	6	51.5	99	1.82	98	0
1931	70.5	1	83.4	1	57.6	8	1.90	93	0
1930	67.6	11	81.1	3	54.1	54	2.16	87	0
1929	66.7	26	79.5	13	54	56	2.64	73	0
1928	61.5	116	72	117	51	104	2.64	73	0
1927	62.1	108	72.7	104	51.5	99	0.64	127	0
1926	64.4	66	73.7	90	55.1	36	5.13	27	0
1925	68.4	8	79.9	10	56.8	13	4.75	32	0
1924	60.5	123	71.2	123	49.8	119	5.91	18	0
1923	65.3	44	76.2	52	54.5	45	5.40	23	0
1922	67.7	10	80.8	7	54.5	45	2.48	81	0
1921	70.1	2	81.8	2	58.4	5	3.27	61	0
1920	65.4	42	77.7	30	53.2	70	3.94	47	0
1919	66.2	34	79	14	53.4	64	0.46	130	0
1918	60.2	126	70.7	126	49.7	120	5.88	19	0
1917	60.2	126	72.1	115	48.2	129	1.71	103	0
1916	63.6	82	76.2	52	51	104	4.82	31	0
1915	66.8	20	77.3	34	56.4	18	1.61	105	0
1914	62.3	105	74.9	67	49.7	120	0.90	124	0
1913	63.4	85	74.9	67	51.9	92	4.55	38	0
1912	66.4	31	76	57	56.8	13	5.28	25	0
1911	66.6	28	78.1	22	55.1	36	3.49	53	0
1910	65.4	42	74.7	72	56.1	22	3.79	51	0
1909	63.8	74	74.8	69	52.9	81	1.84	96	0
1908	65.2	48	77.7	30	52.7	84	1.29	115	0
1907	65	52	73.3	94	56.7	16	4.19	42	0
1906	67.2	15	78.4	20	56.1	22	3.42	54	0
1905	63.9	72	73.6	91	54.2	51	2.95	68	0
1904	63.8	74	74	83	53.9	58	2.60	77	1
1903	63.3	88	73.9	86	52.7	84	1.43	113	0
1902	62.7	100	72.3	109	53.1	74			0
1901	64.2	68	73.8	89	54.7	40	3.21	63	0
1900	68.5	6	80.1	9	56.9	12	1.01	123	0
1899	61.9	111	72	117	51.7	95	2.94	69	0
1898	66.7	26	77.7	30	55.2	34	0.81	126	2
1897	63	91	75.7	59	50.4	112	2.99	66	0
1896	62.5	103	73	98	52.1	90	3.81	49	0
1895	66.6	28	77.3	34	55.9	25	2.12	88	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1931	70.5
1921	70.1
1961	69.9
2015	68.9
2016	68.8
2018	68.5
1900	68.5
1925	68.4
1971	68.2
1922	67.7

Coldest
Year	Mean, °F
1962	59.3
1966	59.4
1975	59.5
1963	59.7
1918	60.2
1917	60.2
1949	60.3
1956	60.5
1924	60.5
1984	60.6

Wettest
Year	Precipitation, in
2011	15.97
1999	12.60
2004	10.61
1975	10.02
2018	9.81
1934	8.88
2021	8.51
2003	8.37
1996	7.82
1977	7.30

Driest
Year	Precipitation, in
1943	0.16
1919	0.46
1964	0.50
1984	0.62
1927	0.64
1898	0.81
1961	0.89
1914	0.90
1900	1.01
2014	1.10

The hottest, coldest and wettest days

Hottest day: 92°F; 1 September 2026
Coldest night: 41°F; 24 September 2026
Wettest day: 1.57 in; 1 September 2026

Every month, season and year

Months

Seasons

Years

Williamsport, PA the day's answers

All-time records

Every answer in words

September 2026 brought 6.84 in of precipitation in Williamsport, PA, the wettest September since 2021, 12th wettest of 131.
The hottest day of September 2026 in Williamsport, PA: 92°F on Tuesday 1 September 2026.
The coldest night of September 2026 in Williamsport, PA: a low of 41°F on Thursday 24 September 2026.
The wettest day of September 2026 in Williamsport, PA: 1.57 in on Tuesday 1 September 2026.