Quincy, IL: September

30 September 2026: September 2026 averaged 73.9°F in Quincy, IL, the warmest September since 1936, tied 6th warmest of 125 (with 1930).

September 2026

Mean temperature: 73.9°F; Warmest since 1936; 6th warmest of 125
Precipitation: 2.56 in; Driest since 2025; 50th driest of 126

A normal September in Quincy, IL (1991 to 2020): a mean temperature of 66.3°F, between 63.3°F and 71.4°F in eight years of ten and 2.59 in of precipitation, between 1.14 in and 5.44 in in eight years of ten.

The mean temperature of every September in Quincy, IL since 1901: 73.9°F in 2026; the highest is 76.7°F, in 1931.

Normal range, 63.3 to 71.4°F

Every year, ranked, as a table

Every September in Quincy, IL from 1901 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	73.9	6	82.9	20	64.8	2	2.56	77	0
2025	70	34	82.8	22	57.1	54	1.01	117	0
2024	69.8	38	81.7	33	57.9	45	2.20	87	0
2023	70.1	31	82.3	27	58	43	0.35	123	0
2022	68.2	60	79.3	60	57	58	4.18	43	0
2021	71.2	19	83.1	17	59.2	31	1.47	107	0
2020	66.1	87	76.6	90	55.5	81	2.18	88	0
2019	73.4	10	83	19	63.7	6	5.06	33	0
2018	70.9	21	81.3	39	60.5	17	5.35	30	0
2017	69.7	41	82.1	29	57.3	50	0.67	121	0
2016	71.4	17	81.6	37	61.2	13	3.09	59	0
2015	71.7	16	82.8	22	60.7	15	1.27	111	0
2014	64.7	107	75.1	107	54.4	92	6.27	20	1
2013	70.2	26	82.9	20	57.5	48	1.80	104	0
2012	65.4	96	77	85	53.8	101	2.93	67	0
2011	64.3	111	76	98	52.5	113	1.16	116	0
2010	67.2	73	77.3	79	57.2	52	2.17	89	0
2009	65.4	96	75.7	102	55.1	86	1.57	106	0
2008	66.2	85	75.2	106	57.1	54	8.61	10	0
2007	70.6	23	83.9	12	57.2	52	1.46	108	0
2006	63.9	113	74.6	113	53.1	107	3.98	46	0
2005	70.7	22	82.1	29	59.3	29	3.40	53	1
2004	67.3	72	79.2	64	55.4	83	0.96	118	0
2003	63	118	74	116	51.9	118	3.56	51	0
2002	69.6	42	81.7	33	57.5	48	0.70	120	0
2001	64.8	104	75.9	101	53.8	101	3.19	58	0
2000	67.6	68	79.7	54	55.5	81	2.49	82	0
1999	65.3	98	78.1	71	52.5	113	1.97	97	0
1998	71.4	17	81.3	39	61.4	10	4.20	42	0
1997	66.8	77	77.6	75	56	76	1.20	114	0
1996	63.3	116	73.8	118	52.7	111	2.54	78	0
1995	62.2	120	72.1	123	52.4	115	2.93	67	0
1994	65.9	91	76.4	95	55.4	83	1.43	109	0
1993	61.1	123	69.4	125	52.8	110	8.77	9	0
1992	64.8	104	75.5	103	54.1	97	2.71	73	0
1991	66.3	83	76.7	88	55.9	77	2.63	75	0
1990	68.9	50	79.6	56	58.2	39	2.70	74	0
1989	63.4	115	74.1	115	52.7	111	2.95	66	0
1988	69.1	45	81.7	33	56.6	70	1.30	110	0
1987	66.2	85	77.8	73	54.3	94	2.13	90	1
1986	70	34	80.2	49	59.7	24	9.49	8	0
1985	66.6	81	76.3	97	56.9	62	3.06	61	0
1984	64.6	109	74.9	111	54.4	92	4.10	45	0
1983	68.5	54	79.9	53	57	58	3.64	50	0
1982	65.9	91	74.9	111	56.8	64	3.23	55	0
1981	65.2	102	76	98	54.5	91	2.11	92	0
1980	70.4	24	81.3	39	59.5	27	5.46	27	0
1979	67.5	69	80.2	49	54.9	87	0.37	122	0
1978	72	15	83.7	13	60.2	19	8.06	13	0
1977	68.4	55	76.6	90	60.2	19	10.51	5	0
1976	65.3	98	77.6	75	52.9	109	3.02	63	0
1975	63.5	114	73.9	117	53	108	6.35	19	0
1974	60.5	124	71.6	124	49.3	124	1.27	111	0
1973	67.9	65	76	98	59.7	24	7.37	16	0
1972	68.8	51	78.6	66	59	33	3.09	59	0
1971	69.1	45	79.7	54	58.6	36	4.53	38	0
1970	68.1	62	77.3	79	59	33	10.84	2	0
1969	66.8	77	77.1	82	56.6	70	4.25	40	0
1968	66	90	76.4	95	55.6	80	6.22	23	0
1967	63.3	116	75	109	51.6	121	3.51	52	0
1966	62.5	119	73.4	119	51.7	120	5.91	24	0
1965	65.8	94	74.6	113	57	58	6.81	18	0
1964	67.5	69	78.3	69	56.7	66	2.77	71	0
1963	68.3	56	80	52	56.7	66	1.88	100	0
1962	64.8	104	75.5	103	54	99	3.35	54	0
1961	66.7	80	76.9	86	56.6	70	10.45	6	0
1960	70.1	31	82	31	58.3	38	0.81	119	0
1959	68.3	56	78.5	67	58.1	40	2.22	86	0
1958	66.3	83	76.7	88	55.8	78	1.82	103	0
1957	64.9	103	76.5	94	53.2	105	2.38	83	0
1956	68.1	62	81.9	32	54.3	94	0.33	125	0
1955	69.2	44	81.6	37	56.7	66	2.54	78	0
1954	70.3	25	83.4	14	57.1	54	2.04	95	0
1953	68.3	56	83.3	16	53.2	105	2.13	90	0
1952	66.4	82	80.8	43	51.9	118	2.50	81	0
1951	61.9	121	72.6	121	51.2	122	3.03	62	0
1950	65.3	98	76.6	90	53.9	100	1.20	114	0
1949	59.9	125	72.2	122	47.7	125	4.61	37	0
1948	69.3	43	80.7	44	57.9	45	1.91	99	0
1947	72.7	11	85	8	60.4	18	4.13	44	0
1946	68.8	51	80.7	44	57	58	2.76	72	0
1945	68.3	56	78.4	68	58.1	40	10.53	4	1
1944	69.1	45	78.9	65	59.3	29	7.02	17	0
1943	65.9	91	77.5	77	54.3	94	2.29	85	0
1942	66.9	76	78	72	55.7	79	3.80	47	0
1941	71.2	19	82.7	24	59.8	23	5.38	28	0
1940	67.5	69	82.7	24	52.3	116	0.34	124	0
1939	72.4	13	86.8	3	58	43	0.14	126	0
1938	70	34	82.6	26	57.3	50	1.25	113	0
1937	70.1	31	83.4	14	56.9	62	1.68	105	0
1936	74.2	4	84.5	9	63.9	5	9.88	7	0
1935	70.2	26	80.9	42	59.4	28	2.86	70	0
1934	66.8	77	77.1	82	56.5	73	6.23	22	0
1933	76.5	2	88.3	1	64.6	4	2.07	94	0
1932	68.2	60	79.6	56	56.7	66	4.66	36	0
1931	76.7	1	87	2	66.3	1	7.46	15	1
1930	73.9	6	85.9	6	61.8	9	1.85	101	0
1929	68.8	51	79.5	58	58.1	40	3.00	64	0
1928	66.1	87	77.7	74	54.6	90	3.22	56	0
1927	74	5	85.2	7	62.8	8	2.98	65	0
1926	69.1	45	77.4	78	60.7	15	11.64	1	0
1925	75.5	3	86.2	4	64.7	3	5.32	31	0
1924	65.3	98	76.9	86	53.7	103	2.63	75	0
1923	70.2	26	80.2	49	60.1	22	6.24	21	0
1922	72.7	11	84.3	10	61.1	14	4.24	41	0
1921	73.8	8	84.1	11	63.6	7	8.10	12	0
1920	72.2	14	83.1	17	61.4	10	4.77	35	0
1919	73.7	9	86.1	5	61.3	12	3.70	49	0
1918	64.4	110	76.6	90	52.3	116	3.74	48	1
1917	67.9	65	79.3	60	56.4	74	3.21	57	0
1916	67.1	74	79.3	60	54.9	87	2.90	69	0
1915	70.2	26	80.7	44	59.7	24	7.78	14	0
1914	69	49	79.3	60	58.7	35	5.15	32	0
1913	70.2	26	81.7	33	58.6	36	1.85	101	0
1912	69.8	38	80.5	47	59.1	32	2.09	93	0
1911	69.8	38	79.4	59	60.2	19	10.79	3	0
1910	65.6	95	75	109	56.2	75	5.36	29	0
1909	64.7	107	75.3	105	54.1	97	4.90	34	1
1908	70	34	82.3	27	57.7	47	2.31	84	0
1907	66.1	87	77.2	81	54.9	87	1.92	98	0
1906							5.56	26	4
1905	67.7	67	78.3	69	57.1	54	5.88	25	0
1904	67	75	77.1	82	56.8	64	8.38	11	0
1903	64.3	111	75.1	107	53.4	104	4.42	39	0
1902	61.4	122	72.9	120	49.9	123	2.01	96	0
1901	68	64	80.5	47	55.4	83	2.51	80	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1931	76.7
1933	76.5
1925	75.5
1936	74.2
1927	74
2026	73.9
1930	73.9
1921	73.8
1919	73.7
2019	73.4

Coldest
Year	Mean, °F
1949	59.9
1974	60.5
1993	61.1
1902	61.4
1951	61.9
1995	62.2
1966	62.5
2003	63
1996	63.3
1967	63.3

Wettest
Year	Precipitation, in
1926	11.64
1970	10.84
1911	10.79
1945	10.53
1977	10.51
1961	10.45
1936	9.88
1986	9.49
1993	8.77
2008	8.61

Driest
Year	Precipitation, in
1939	0.14
1956	0.33
1940	0.34
2023	0.35
1979	0.37
2017	0.67
2002	0.70
1960	0.81
2004	0.96
2025	1.01

The hottest, coldest and wettest days

Hottest day: 99°F; 1 September 2026
Coldest night: 52°F; 23 September 2026
Wettest day: 0.71 in; 16 September 2026

Every month, season and year

Months

Seasons

Years

Quincy, IL the day's answers

All-time records

Every answer in words

September 2026 brought 2.56 in of precipitation in Quincy, IL, the driest September since 2025, 50th driest of 126.
The hottest day of September 2026 in Quincy, IL: 99°F on Tuesday 1 September 2026.
The coldest night of September 2026 in Quincy, IL: a low of 52°F on Wednesday 23 September 2026.
The wettest day of September 2026 in Quincy, IL: 0.71 in on Wednesday 16 September 2026.