Allentown, PA: September

30 September 2026: September 2026 averaged 67.2°F in Allentown, PA, the warmest September since 2025, 19th warmest of 103.

September 2026

Mean temperature: 67.2°F; Warmest since 2025; 19th warmest of 103
Precipitation: 4.44 in; Wettest since 2021; 37th wettest of 111

A normal September in Allentown, PA (1991 to 2020): a mean temperature of 65.4°F, between 62.3°F and 68.9°F in eight years of ten and 3.78 in of precipitation, between 1.51 in and 9.71 in in eight years of ten.

The mean temperature of every September in Allentown, PA since 1923: 67.2°F in 2026; the highest is 70.8°F, in 1961.

Normal range, 62.3 to 68.9°F

Every year, ranked, as a table

Every September in Allentown, PA from 1912 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	67.2	19	76.2	41	58.1	8	4.44	37	0
2025	67.6	13	79.1	15	56	21	2.66	74	0
2024	65.2	56	75.7	49	54.7	44	1.30	101	0
2023	65.8	39	75.6	54	56	21	4.03	47	0
2022	64.9	58	75.5	56	54.4	50	3.47	60	0
2021	66.4	28	76.8	35	56	21	8.12	8	0
2020	64.9	58	75.8	47	53.9	58	4.16	43	0
2019	68.9	7	80.5	8	57.2	10	1.34	98	0
2018	70.2	3	77.8	28	62.5	1	6.65	19	0
2017	67.7	12	79.1	15	56.4	16	3.80	51	0
2016	69.2	6	81.6	3	56.7	13	3.42	61	0
2015	69.7	4	82	1	57.3	9	4.70	34	0
2014	65.9	35	77.9	26	53.9	58	1.53	94	0
2013	63.3	81	75.5	56	51.1	93	2.08	86	0
2012	65.3	50	76.1	44	54.5	47	4.76	33	0
2011	67.3	15	75.4	59	59.2	4	12.99	1	0
2010	66.6	25	79	18	54.2	56	7.48	14	0
2009	62.7	85	72.6	93	52.8	78	2.93	70	0
2008	65.9	35	76.6	38	55.3	33	8.11	9	0
2007	67	21	80	9	53.9	58	0.57	109	0
2006	62.2	93	71.9	97	52.5	85	5.79	25	0
2005	68.7	8	81.7	2	55.7	28	0.76	108	0
2004	66.2	30	76.5	39	56	21	9.56	5	0
2003	65.6	43	74.8	67	56.3	17	11.08	3	0
2002	66.4	28	78.3	22	54.4	50	2.38	80	0
2001	62.3	92	75.1	63	49.4	102	4.21	42	0
2000	61.6	96	72.4	96	50.7	98	3.75	53	0
1999	65.3	50	75.7	49	54.9	38	11.57	2	0
1998	65.8	39	77.2	30	54.3	54	2.96	67	0
1997	62	95	72.8	91	51.2	92	3.54	58	0
1996	64.2	67	74.2	76	54.2	56	5.20	28	0
1995	64.5	64	75.7	49	53.3	69	2.66	74	0
1994	65	57	75.2	62	54.7	44	2.61	77	0
1993	64.1	69	73	88	55.2	35	7.77	10	0
1992	63.7	77	73.5	84	53.8	62	3.42	61	0
1991	64.7	63	76.1	44	53.3	69	3.32	63	0
1990	63.1	83	73.7	80	52.4	87	1.97	89	0
1989	65.5	44	75.6	54	55.4	31	5.93	24	0
1988	62.8	84	72.9	90	52.6	84	3.21	65	0
1987	64.3	66	73.6	83	54.9	38	8.87	6	0
1986	64.1	69	73.7	80	54.5	47	3.07	66	0
1985	66.1	32	77.1	31	55.2	35	8.72	7	0
1984	62.4	88	73.7	80	51.1	93	1.10	103	0
1983	66.5	26	79.3	14	53.6	63	1.41	97	0
1982	64.1	69	73.4	85	54.8	41	1.76	91	0
1981	63.5	79	72.8	91	54.3	54	2.74	73	0
1980	70.3	2	81.4	5	59.2	4	1.99	88	0
1979	65.3	50	74.7	69	55.8	26	7.19	17	0
1978	64.2	67	74.8	67	53.6	63	2.28	83	0
1977	66.7	22	75.1	63	58.3	6	4.10	46	0
1976	63.3	81	74.7	69	52	88	4.60	36	0
1975	61.3	99	70	104	52.5	85	7.60	12	0
1974	62.5	87	71.9	97	53.1	75	6.67	18	0
1973	65.9	35	76.3	40	55.4	31	6.18	22	0
1972	64.8	61	75.7	49	53.9	58	1.27	102	0
1971	67.6	13	75.4	59	59.9	3	3.71	54	0
1970	67.3	15	78.5	20	56.1	19	2.96	67	0
1969	63.6	78	74.3	75	52.8	78	3.87	50	0
1968	66.5	26	79.5	12	53.4	67	2.64	76	0
1967	61.3	99	74.6	71	48	104	0.94	105	0
1966	62.4	88	71.4	100	53.3	69	6.23	21	0
1965	65.8	39	75.7	49	55.8	26	2.29	81	0
1964	65.8	39	78.1	25	53.5	65	2.17	85	0
1963	60.9	101	72.5	94	49.2	103	6.59	20	0
1962	60.4	103	70.3	102	50.5	100	4.28	40	0
1961	70.8	1	81.5	4	60	2	1.53	94	0
1960	64.8	61	74	77	55.5	30	7.54	13	0
1959	68.2	9	79.4	13	57	11	4.15	44	0
1958	63.4	80	75.1	63	51.7	91	5.72	26	0
1957	65.9	35	76.8	35	54.9	38	2.06	87	0
1956	60.9	101	71.1	101	50.7	98	3.27	64	0
1955	63.8	76	74	77	53.5	65	2.58	78	0
1954	64.5	64	74.5	72	54.5	47	2.96	67	0
1953	65.3	50	77.1	31	53.4	67	3.51	59	0
1952	64.9	58	76.7	37	53.2	74	7.69	11	0
1951	63.9	74	75	66	52.8	78	2.46	79	0
1950	61.6	96	70.3	102	52.9	77	3.79	52	0
1949	62.1	94	73	88	51.1	93	5.04	31	0
1948	65.5	44	77.8	28	53.1	75	1.32	100	0
1947	65.3	50	76.2	41	54.4	50	2.81	72	0
1946	66.2	30	79.1	15	53.3	69	4.44	37	0
1945	66.7	22	76.9	33	56.5	14	5.33	27	0
1944	65.5	44	75.4	59	55.6	29	4.64	35	0
1943	64.1	69	76.2	41	51.9	90	0.12	111	0
1942	65.3	50	75.8	47	54.8	41	4.35	39	0
1941	67.3	15	81.2	6	53.3	69	0.40	110	0
1940	62.7	85	74.4	73	51	97	4.01	48	0
1939	66.7	22	78.5	20	54.8	41	1.33	99	0
1938	62.4	88	73.4	85	52	88	7.22	16	2
1937	63.9	74	75.5	56	52.8	78	0.91	106	2
1936	67.3	15	78.2	23	56.1	19	0.87	107	2
1935	61.4	98	72.5	94	50.3	101	5.13	29	0
1934	65.5	44	74.4	73	56.5	14	10.19	4	0
1933	66	34	76	46	56	21	5.94	23	0
1932	65.4	49	77.9	26	52.8	78	0.95	104	0
1931	69.4	5	80.6	7	58.2	7	1.65	92	0
1930	68.1	10	80	9	56.2	18	1.45	96	0
1929	67.1	20	79.8	11	54.7	44	5.09	30	2
1928			71.7	99			2.22	84	11
1927	65.5	44	78.2	23	52.7	83	1.64	93	0
1926	64	73	73.4	85	54.4	50	4.23	41	1
1925	67.9	11	78.6	19	57	11	4.12	45	1
1924	62.4	88	73.8	79	51.1	93	5.00	32	1
1923	66.1	32	76.9	33	55.3	33	3.63	56	0
1922					55.1	37	1.87	90	30
1919							2.29	81	30
1918							2.91	71	30
1916							3.58	57	30
1915							3.65	55	30
1913							3.97	49	30
1912							7.43	15	30

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1961	70.8
1980	70.3
2018	70.2
2015	69.7
1931	69.4
2016	69.2
2019	68.9
2005	68.7
1959	68.2
1930	68.1

Coldest
Year	Mean, °F
1962	60.4
1963	60.9
1956	60.9
1975	61.3
1967	61.3
1935	61.4
2000	61.6
1950	61.6
1997	62
1949	62.1

Wettest
Year	Precipitation, in
2011	12.99
1999	11.57
2003	11.08
1934	10.19
2004	9.56
1987	8.87
1985	8.72
2021	8.12
2008	8.11
1993	7.77

Driest
Year	Precipitation, in
1943	0.12
1941	0.40
2007	0.57
2005	0.76
1936	0.87
1937	0.91
1967	0.94
1932	0.95
1984	1.10
1972	1.27

The hottest, coldest and wettest days

Hottest day: 88°F; 1 September 2026
Coldest night: 45°F; 15 September 2026
Wettest day: 1.11 in; 20 September 2026

Every month, season and year

Months

Seasons

Years

Allentown, PA the day's answers

All-time records

Every answer in words

September 2026 brought 4.44 in of precipitation in Allentown, PA, the wettest September since 2021, tied 37th wettest of 111 (with 1946).
The hottest day of September 2026 in Allentown, PA: 88°F on Tuesday 1 September 2026.
The coldest night of September 2026 in Allentown, PA: a low of 45°F on Tuesday 15 September 2026.
The wettest day of September 2026 in Allentown, PA: 1.11 in on Sunday 20 September 2026.