Chicago, IL: September

30 September 2026: September 2026 averaged 70.1°F in Chicago, IL, the warmest September since 2024, tied 10th warmest of 155 (with 1906).

September 2026

Mean temperature: 70.1°F; Warmest since 2024; 10th warmest of 155
Precipitation: 3.70 in; Wettest since 2019; 50th wettest of 156

A normal September in Chicago, IL (1991 to 2020): a mean temperature of 65.3°F, between 62.4°F and 69.4°F in eight years of ten and 2.69 in of precipitation, between 1.04 in and 5.87 in in eight years of ten.

The mean temperature of every September in Chicago, IL since 1872: 70.1°F in 2026; the highest is 71.2°F, in 1931.

Normal range, 62.4 to 69.4°F

Every year, ranked, as a table

Every September in Chicago, IL 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	70.1	10	77.3	32	63	7	3.70	50	0
2025	69.3	22	78.9	12	59.7	36	0.49	149	0
2024	70.6	2	80.3	2	60.9	26	1.32	124	0
2023	69.5	16	77.7	24	61.2	21	3.36	59	0
2022	67.4	45	76	47	58.8	47	2.20	92	0
2021	70.3	6	79.8	5	60.7	28	1.23	128	0
2020	66.3	61	74.6	72	57.9	60	3.18	67	0
2019	69.4	19	76.9	36	61.9	15	7.61	6	0
2018	68.9	30	77.5	29	60.4	33	3.65	52	0
2017	69.4	19	79.7	7	59.1	44	0.32	152	0
2016	69.6	15	77.7	24	61.4	17	1.76	108	0
2015	69	27	78.1	20	59.8	35	4.64	29	0
2014	63.9	116	73.7	85	54.2	120	2.71	78	0
2013	67.2	47	77.1	33	57.3	69	2.57	82	0
2012	64.1	111	74.5	75	53.7	127	1.76	108	0
2011	62.2	134	69.9	138	54.4	117	3.45	58	0
2010	65.1	83	74.2	81	56.1	95	2.78	75	0
2009	65.4	79	74.3	79	56.4	91	1.03	137	0
2008	66.1	67	75.2	64	57.1	76	13.63	2	0
2007	68.1	36	79.2	9	57	81	1.23	128	0
2006	62.4	132	71.1	125	53.7	127	5.85	16	0
2005	69.4	19	80.1	3	58.7	51	2.66	79	0
2004	66.5	59	78.4	16	54.6	113	0.26	155	0
2003	63.3	123	73.7	85	53	137	1.72	110	0
2002	67.3	46	78.9	12	55.8	100	1.72	110	0
2001	61.9	137	71	126	52.8	140	6.05	14	0
2000	64.7	94	74.6	72	54.8	110	3.59	54	0
1999	63.4	121	75.7	54	51.1	150	3.27	62	0
1998	67.7	39	78.3	17	57.1	76	2.34	89	0
1997	64.2	107	74.2	81	54.1	122	1.69	112	0
1996	63.4	121	73.3	93	53.6	130	2.73	77	0
1995	62.5	129	73.5	89	51.5	148	1.04	135	0
1994	66.8	53	76.5	42	57.1	76	1.04	135	0
1993	59.2	155	67.8	147	50.6	153	4.47	31	0
1992	62.7	127	72.7	101	52.7	143	4.31	35	0
1991	63.7	118	74.8	70	52.6	144	2.51	84	0
1990	65.9	70	75.7	54	56.1	95	1.03	137	0
1989	62	136	72.6	106	51.3	149	3.91	42	0
1988	65.8	72	77	34	54.7	111	3.79	46	0
1987	65	87	75.9	51	54.2	120	0.94	140	0
1986	66.8	53	75.6	58	57.9	60	7.12	7	0
1985	65.4	79	76.3	44	54.5	114	1.82	107	0
1984	61	145	72.7	101	49.4	154	3.84	45	0
1983	64.6	96	76.8	38	52.4	145	5.41	21	0
1982	62.1	135	72.2	110	52	146	1.15	131	0
1981	61.7	139	71.4	120	52	146	3.25	65	0
1980	66	69	75.6	58	56.3	92	5.65	19	0
1979	65.8	72	75.2	64	56.3	92	0.01	156	0
1978	70.2	8	80.7	1	59.7	36	2.80	74	0
1977	65.8	72	73.5	89	58.1	57	9.44	3	0
1976	64.5	100	75.3	63	53.7	127	2.17	93	0
1975	61.4	143	69.9	138	52.8	140	1.09	133	0
1974	61.5	141	72	114	50.9	152	1.53	117	0
1973	67	50	75.5	60	58.5	54	4.23	36	0
1972	64.8	93	73.1	95	56.5	88	5.75	17	0
1971	70.4	5	79.4	8	61.3	18	3.47	57	0
1970	66.2	63	75.2	64	57.1	76	6.71	10	0
1969	66.4	60	74.9	69	57.9	60	1.31	125	0
1968	66.7	57	76.1	46	57.3	69	3.68	51	0
1967	64.7	94	74.4	77	55.1	108	3.17	68	0
1966	65	87	74.6	72	55.4	104	0.92	141	0
1965	65	87	72.8	99	57.1	76	6.21	13	0
1964	65.9	70	75.9	51	55.8	100	2.50	85	0
1963	67.6	41	77.8	23	57.3	69	2.63	81	0
1962	64.2	107	73.7	85	54.7	111	0.77	147	0
1961	69.2	25	78.8	15	59.6	40	14.17	1	0
1960	70.6	2	78.9	12	62.2	10	1.40	120	0
1959	69	27	78.3	17	59.7	36	2.17	93	0
1958	66.2	63	75.5	60	56.8	84	1.86	105	0
1957	64.1	111	73	96	55.3	105	1.08	134	0
1956	65	87	76.3	44	53.6	130	0.46	151	0
1955	67.8	37	78.2	19	57.5	67	1.47	119	0
1954	69.3	22	79.9	4	58.8	47	0.83	146	0
1953	67.5	43	79.8	5	55.3	105	2.02	97	0
1952	65.5	78	77.7	24	53.3	134	1.61	113	0
1951	62.8	125	72.7	101	53	137	5.29	22	0
1950	64.9	91	72.9	98	56.9	83	2.00	100	0
1949	60.4	149	71.4	120	49.4	154	1.24	127	0
1948	67.8	37	77.5	29	58.1	57	2.38	88	0
1947	66.8	53	77.4	31	56.1	95	3.26	63	0
1946	65.6	76	77.7	24	53.5	133	2.01	99	0
1945	64	115	72.7	101	55.2	107	6.01	15	0
1944	66.3	61	76.5	42	56	98	1.56	114	0
1943	61.6	140	72.2	110	51	151	0.92	141	0
1942	62.5	129	72.1	113	52.8	140	5.12	26	0
1941	68.8	32	76.9	36	60.6	29	5.20	24	0
1940	64.6	96	72.5	107	56.6	87	0.31	154	0
1939	70	12	79.2	9	60.8	27	0.49	149	0
1938	65.1	83	71.5	118	58.6	53	5.29	22	0
1937	65.1	83	73.5	89	56.7	86	1.89	103	0
1936	68.2	35	75.1	67	61.2	21	8.97	4	0
1935	65.8	72	74.4	77	57.2	73	3.28	61	0
1934	64.2	107	71.3	124	57	81	4.03	38	0
1933	69.8	14	77.6	28	62	13	3.78	47	0
1932	64.5	100	71.5	118	57.4	68	1.12	132	0
1931	71.2	1	79.1	11	63.3	4	5.14	25	0
1930	66.9	52	75	68	58.8	47	1.29	126	0
1929	64.6	96	72	114	57.3	69	3.03	71	0
1928	61.5	141	69.7	142	53.2	135	1.87	104	0
1927	69.1	26	76.8	38	61.3	18	6.72	9	0
1926	64.4	102	70.7	133	58	59	5.03	27	0
1925	70.3	6	76	47	64.5	1	3.19	66	0
1924	60.3	152	66.1	154	54.5	114	3.14	70	0
1923	65.1	83	70.5	134	59.7	36	2.50	85	0
1922	69.5	16	75.7	54	63.3	4	4.37	33	0
1921	70	12	76.6	41	63.5	3	5.72	18	0
1920	69.3	22	76	47	62.6	8	3.35	60	0
1919	68.9	30	75.9	51	61.9	15	3.85	44	0
1918	59.6	154	66.1	154	53.1	136	1.84	106	0
1917	63.7	118	69.6	143	57.8	63	2.15	95	0
1916	64.4	102	72.5	107	56.3	92	2.24	91	0
1915	67.2	47	73.3	93	61.1	24	3.53	55	0
1914	66.6	58	72.7	101	60.5	31	1.56	114	0
1913	65.4	79	71.7	117	59.1	44	1.49	118	0
1912	67.7	39	74.3	79	61.1	24	3.26	63	0
1911	67	50	72.8	99	61.2	21	4.03	38	0
1910	65.2	82	70.9	129	59.5	41	3.90	43	0
1909	64.1	111	69.8	141	58.3	55	3.60	53	0
1908	70.6	2	77.9	22	63.2	6	2.09	96	0
1907	64.6	96	71.4	120	57.8	63	4.49	30	0
1906	70.1	10	75.7	54	64.5	1	5.54	20	0
1905	67.5	43	74.5	75	60.5	31	4.18	37	0
1904	64.3	105	71.4	120	57.2	73	2.65	80	0
1903	64.2	107	72	114	56.5	88	4.00	41	0
1902	60.8	147	67.4	148	54.1	122	4.83	28	0
1901	64.3	105	70.9	129	57.7	66	2.92	73	0
1900	65.6	76	72.3	109	58.8	47	1.56	114	0
1899	62.7	127	69.4	144	56	98	2.39	87	0
1898	67.6	41	73.8	84	61.3	18	3.16	69	0
1897	69.5	16	76.8	38	62.2	10	0.84	145	0
1896	60.4	149	67	150	53.9	125	6.54	11	0
1895	68.6	34	77	34	60.2	34	0.89	144	0
1894	66.2	63	73	96	59.4	42	8.28	5	0
1893	64.1	111	71	126	57.2	73	1.98	102	0
1892	63.9	116	71	126	56.8	84	1.34	123	0
1891	69	27	76	47	62.1	12	0.32	152	0
1890	60.4	149	66.8	151	54	124	1.39	121	0
1889	62.8	125	69.9	138	55.7	103	2.75	76	0
1888	59.8	153	66.7	152	52.9	139	0.98	139	0
1887	62.3	133	70.2	136	54.5	114	4.03	38	0
1886	66.1	67	73.4	92	58.7	51	6.93	8	0
1885	64.4	102	70.5	134	58.3	55	2.97	72	0
1884	68.7	33	75.5	60	62	13	2.56	83	0
1883	60.5	148	66.7	152	54.4	117	1.36	122	0
1882	64.9	91	70.8	131	59	46	0.91	143	0
1881	70.2	8	78	21	62.5	9	4.34	34	0
1880	62.9	124	70	137	55.8	100	2.25	90	0
1879	61.1	144	68.5	145	53.6	130	1.18	130	0
1878	66.2	63	74.7	71	57.8	63	1.99	101	0
1877	66.8	53	74.1	83	59.4	42	2.02	97	0
1876	61.8	138	67.1	149	56.5	88	3.74	49	0
1875	60.9	146	67.9	146	53.9	125	4.39	32	0
1874	67.1	49	73.6	88	60.6	29	3.76	48	0
1873	62.5	129	70.8	131	54.3	119	3.53	55	0
1872	63.5	120	72.2	110	54.9	109	6.43	12	0
1871							0.74	148	30

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1931	71.2
2024	70.6
1960	70.6
1908	70.6
1971	70.4
2021	70.3
1925	70.3
1978	70.2
1881	70.2
2026	70.1
More years share the last value

Coldest
Year	Mean, °F
1993	59.2
1918	59.6
1888	59.8
1924	60.3
1949	60.4
1896	60.4
1890	60.4
1883	60.5
1902	60.8
1875	60.9

Wettest
Year	Precipitation, in
1961	14.17
2008	13.63
1977	9.44
1936	8.97
1894	8.28
2019	7.61
1986	7.12
1886	6.93
1927	6.72
1970	6.71

Driest
Year	Precipitation, in
1979	0.01
2004	0.26
1940	0.31
2017	0.32
1891	0.32
1956	0.46
2025	0.49
1939	0.49
1871	0.74
1962	0.77

The hottest, coldest and wettest days

Hottest day: 96°F; 2 September 2026
Coldest night: 49°F; 27 September 2026
Wettest day: 1.21 in; 20 September 2026

Every month, season and year

Months

Seasons

Years

Chicago, IL the day's answers

All-time records

Every answer in words

September 2026 brought 3.70 in of precipitation in Chicago, IL, the wettest September since 2019, 50th wettest of 156.
The hottest day of September 2026 in Chicago, IL: 96°F on Wednesday 2 September 2026.
The coldest night of September 2026 in Chicago, IL: a low of 49°F on Sunday 27 September 2026.
The wettest day of September 2026 in Chicago, IL: 1.21 in on Sunday 20 September 2026.