Chicago, IL: August

31 August 2026: August 2026 averaged 74.2°F in Chicago, IL, the warmest August since 2024, tied 40th warmest of 155 (with 1914).

August 2026

Mean temperature: 74.2°F; Warmest since 2024; 40th warmest of 155
Precipitation: 5.02 in; Wettest since 2025; 34th wettest of 156

A normal August in Chicago, IL (1991 to 2020): a mean temperature of 73.3°F, between 69.4°F and 76.3°F in eight years of ten and 3.68 in of precipitation, between 1.79 in and 7.38 in in eight years of ten.

The mean temperature of every August in Chicago, IL since 1872: 74.2°F in 2026; the highest is 80.2°F, in 1947.

Normal range, 69.4 to 76.3°F

Every year, ranked, as a table

Every August 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	74.2	40	81.6	65	66.8	32	5.02	34	0
2025	73.3	65	81.6	65	65	71	5.03	32	0
2024	74.8	29	83.8	27	65.9	49	2.60	91	0
2023	74.3	36	83	37	65.5	59	1.33	132	0
2022	74.4	34	83	37	65.7	52	2.05	112	0
2021	77.1	6	86.2	9	68.1	13	4.51	40	0
2020	76.8	7	86.4	8	67.2	26	0.80	150	0
2019	72.9	75	81.5	70	64.3	92	3.63	65	0
2018	76.3	12	84.8	16	67.7	18	6.61	16	0
2017	71.5	107	80.7	78	62.2	125	2.51	94	0
2016	75.8	15	84.3	21	67.4	25	4.26	46	0
2015	71.8	98	80.9	76	62.6	118	2.16	102	0
2014	73.7	48	82.1	53	65.3	65	7.30	13	0
2013	73	74	82.7	43	63.3	106	1.69	122	0
2012	73.3	65	84	24	62.6	118	2.07	110	0
2011	73.5	55	82.5	45	64.4	87	4.54	38	0
2010	76.7	9	85.7	10	67.7	18	1.80	119	0
2009	70.5	124	79.1	110	61.8	129	4.26	46	0
2008	72.7	79	81.8	60	63.6	96	3.73	60	0
2007	74.8	29	83.2	33	66.4	41	9.70	4	0
2006	74.3	36	83	37	65.6	56	2.95	88	0
2005	74.3	36	84	24	64.5	83	2.47	98	0
2004	67.5	152	77	134	58	153	5.30	30	0
2003	73.6	51	82.8	41	64.4	87	4.19	51	0
2002	73.1	72	82.8	41	63.5	102	8.06	9	0
2001	73.2	70	81.7	63	64.7	80	12.25	2	0
2000	72.4	88	81.8	60	63	109	2.26	100	0
1999	70.3	128	79.3	105	61.3	137	2.30	99	0
1998	73.4	57	82.5	45	64.4	87	6.88	14	0
1997	69.5	134	78.2	121	60.8	142	4.50	41	0
1996	72.3	90	82.1	53	62.4	123	1.45	127	0
1995	79	2	87.7	4	70.3	1	3.49	71	0
1994	68.7	141	78.3	119	59	150	4.05	54	0
1993	73.3	65	82.5	45	64	95	5.74	24	0
1992	67	153	77.3	131	56.7	155	3.56	68	0
1991	73.6	51	84.4	20	62.8	112	2.81	89	0
1990	71.8	98	81	75	62.7	116	7.75	11	0
1989	71.4	112	81.2	73	61.5	134	7.31	12	0
1988	76.8	7	86.8	6	66.8	32	3.29	78	0
1987	71.8	98	81.5	70	62.2	125	17.10	1	0
1986	68.5	143	79.3	105	57.7	154	1.15	138	0
1985	69.2	136	80	94	58.4	151	3.90	58	0
1984	72.8	77	85.1	12	60.5	145	2.10	106	0
1983	77.3	5	87.8	3	66.8	32	2.08	109	0
1982	68.8	140	79.2	107	58.3	152	3.93	57	0
1981	71.2	115	80.7	78	61.7	130	6.60	17	0
1980	75.7	17	84.8	16	66.6	35	8.54	7	0
1979	71.6	105	78.8	111	64.5	83	8.64	6	0
1978	73.4	57	81.7	63	65	71	1.69	122	0
1977	71.8	98	80.1	92	63.6	96	9.68	5	0
1976	71.5	107	81.9	58	61.1	140	0.80	150	0
1975	76.3	12	84.1	23	68.6	10	5.51	26	0
1974	72	93	81.3	72	62.6	118	0.90	147	0
1973	76.6	10	85.6	11	67.7	18	0.85	148	0
1972	73.4	57	81.6	65	65.1	68	6.19	21	0
1971	72.4	88	82	56	62.8	112	1.96	115	0
1970	75.2	23	83.9	26	66.5	38	3.47	74	0
1969	75.3	22	84.9	13	65.7	52	1.11	140	0
1968	74.7	31	83.8	27	65.5	59	5.31	29	0
1967	69.2	136	77.9	124	60.5	145	2.07	110	0
1966	71.6	105	80.5	85	62.8	112	1.41	131	0
1965	70.3	128	78.8	111	61.7	130	6.79	15	0
1964	71.7	104	82.2	52	61.2	138	2.19	101	0
1963	72.5	85	82.4	49	62.7	116	2.15	104	0
1962	74.7	31	84.3	21	65.1	68	0.85	148	0
1961	74.4	34	83.3	31	65.5	59	6.07	22	0
1960	75.6	20	84.9	13	66.4	41	1.02	143	0
1959	78.6	4	87.3	5	70	2	1.63	124	0
1958	73.8	47	83.2	33	64.4	87	2.51	94	0
1957	73.4	57	82.1	53	64.7	80	5.36	27	0
1956	74.1	42	83.2	33	64.9	75	4.18	52	0
1955	78.7	3	88.7	2	68.7	9	5.35	28	0
1954	73.3	65	81.9	58	64.6	82	5.91	23	0
1953	75.8	15	86.8	6	64.8	77	1.00	144	0
1952	72.7	79	82.6	44	62.8	112	3.69	62	0
1951	69.9	131	79.2	107	60.7	143	4.86	37	0
1950	70	130	80	94	59.9	148	1.78	120	0
1949	74.7	31	84.9	13	64.5	83	1.31	133	0
1948	73.6	51	83.6	29	63.6	96	2.50	96	0
1947	80.2	1	90.9	1	69.5	5	3.16	81	0
1946	69.9	131	80.6	81	59.2	149	1.93	116	0
1945	72	93	82	56	61.9	127	4.23	49	0
1944	74.1	42	84.6	19	63.6	96	1.89	117	0
1943	75	25	84.8	16	65.2	67	5.20	31	0
1942	72.3	90	82.3	50	62.3	124	3.61	66	0
1941	73.7	48	81.2	73	66.1	45	2.16	102	0
1940	72	93	78	123	66.1	45	3.95	56	0
1939	72.7	79	80.5	85	64.8	77	1.47	126	0
1938	75	25	82.5	45	67.5	24	2.12	105	0
1937	75.7	17	83.5	30	67.9	14	2.68	90	0
1936	74.9	27	83	37	66.9	31	4.29	45	0
1935	73.4	57	80.5	85	66.4	41	3.56	68	0
1934	72.5	85	79.9	97	65	71	3.41	75	0
1933	71.5	107	78.1	122	64.8	77	1.14	139	0
1932	73.7	48	81.6	65	65.8	50	3.08	84	0
1931	73.1	72	80.6	81	65.7	52	5.67	25	0
1930	73.4	57	80.2	90	66.5	38	1.17	137	0
1929	70.5	124	77.7	125	63.4	105	3.49	71	0
1928	72.2	92	79.4	103	65	71	5.03	32	0
1927	66.7	154	73.3	153	60.1	147	3.17	80	0
1926	72	93	78.5	117	65.5	59	0.99	145	0
1925	73.6	51	79.5	101	67.7	18	2.09	108	0
1924	71	118	77.7	125	64.2	93	8.12	8	0
1923	70.9	120	76.8	135	64.9	75	7.76	10	0
1922	73.2	70	79.5	101	67	29	1.45	127	0
1921	72.7	79	78.3	119	67.2	26	4.92	36	0
1920	71	118	76.5	140	65.6	56	3.16	81	0
1919	73.4	57	80.6	81	66.1	45	1.10	141	0
1918	75.7	17	82.3	50	69.1	7	1.27	134	0
1917	70.4	127	76.7	136	64.1	94	1.24	135	0
1916	76.6	10	83.3	31	69.9	3	1.05	142	0
1915	66.5	155	71.7	155	61.4	135	4.33	44	0
1914	74.2	40	80.6	81	67.8	15	3.76	59	0
1913	74.3	36	80.8	77	67.8	15	4.06	53	0
1912	70.9	120	77.4	130	64.5	83	3.59	67	0
1911	71.8	98	77.6	127	66	48	3.72	61	0
1910	73.3	65	80	94	66.6	35	3.08	84	0
1909	74.9	27	80.7	78	69	8	6.20	20	0
1908	73.4	57	79.7	99	67	29	6.35	19	0
1907	71.1	117	77.2	132	65.1	68	4.22	50	0
1906	75.6	20	81.6	65	69.6	4	1.43	130	0
1905	74	44	80.2	90	67.8	15	4.46	43	0
1904	68.1	148	75.2	145	60.9	141	4.00	55	0
1903	68.3	146	73.6	152	62.9	111	3.49	71	0
1902	68.3	146	73.2	154	63.3	106	1.44	129	0
1901	71.5	107	76.6	138	66.5	38	2.00	114	0
1900	76.3	12	83.1	36	69.5	5	4.24	48	0
1899	73.5	55	78.8	111	68.2	12	0.91	146	0
1898	71.4	112	77.5	129	65.4	64	3.03	87	0
1897	69	138	75	147	63	109	1.70	121	0
1896	72.8	77	79.7	99	65.8	50	3.52	70	0
1895	72.5	85	79.2	107	65.7	52	6.49	18	0
1894	70.8	122	77.2	132	64.4	87	0.60	152	0
1893	69.8	133	76	142	63.6	96	0.18	156	0
1892	70.7	123	75.9	143	65.5	59	1.85	118	0
1891	69	138	75.5	144	62.5	121	4.52	39	0
1890	67.6	151	73.7	151	61.4	135	2.58	93	0
1889	70.5	124	77.6	127	63.3	106	0.39	155	0
1888	69.3	135	76.7	136	61.9	127	2.10	106	0
1887	68.6	142	76.5	140	60.6	144	3.35	77	0
1886	72.6	84	78.7	115	66.6	35	3.38	76	0
1885	68.4	144	74.3	149	62.5	121	11.28	3	0
1884	68.4	144	75.1	146	61.7	130	2.50	96	0
1883	67.9	150	74.1	150	61.7	130	1.21	136	0
1882	71.4	112	76.6	138	66.2	44	4.96	35	0
1881	75.2	23	81.8	60	68.6	10	0.54	153	0
1880	72.7	79	80.1	92	65.3	65	4.47	42	0
1879	72	93	78.4	118	65.6	56	0.45	154	0
1878	74	44	80.4	88	67.7	18	3.66	63	0
1877	71.8	98	79.9	97	63.6	96	3.06	86	0
1876	74	44	80.3	89	67.6	23	3.66	63	0
1875	68.1	148	75	147	61.2	138	3.29	78	0
1874	72.9	75	78.7	115	67.2	26	3.15	83	0
1873	71.2	115	78.8	111	63.5	102	1.58	125	0
1872	71.5	107	79.4	103	63.5	102	2.59	92	0
1871							2.01	113	31

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1947	80.2
1995	79
1955	78.7
1959	78.6
1983	77.3
2021	77.1
2020	76.8
1988	76.8
2010	76.7
1973	76.6
More years share the last value

Coldest
Year	Mean, °F
1915	66.5
1927	66.7
1992	67
2004	67.5
1890	67.6
1883	67.9
1904	68.1
1875	68.1
1903	68.3
1902	68.3

Wettest
Year	Precipitation, in
1987	17.10
2001	12.25
1885	11.28
2007	9.70
1977	9.68
1979	8.64
1980	8.54
1924	8.12
2002	8.06
1923	7.76

Driest
Year	Precipitation, in
1893	0.18
1889	0.39
1879	0.45
1881	0.54
1894	0.60
2020	0.80
1976	0.80
1973	0.85
1962	0.85
1974	0.90

The hottest, coldest and wettest days

Hottest day: 87°F; 31 August 2026, 10 August 2026, 7 August 2026
Coldest night: 58°F; 24 August 2026
Wettest day: 1.85 in; 1 August 2026

Every month, season and year

Months

Seasons

Years

Chicago, IL the day's answers

All-time records

Every answer in words

August 2026 brought 5.02 in of precipitation in Chicago, IL, the wettest August since 2025, 34th wettest of 156.
The hottest day of August 2026 in Chicago, IL: 87°F on Monday 31 August 2026, Monday 10 August 2026 and Friday 7 August 2026.
The coldest night of August 2026 in Chicago, IL: a low of 58°F on Monday 24 August 2026.
The wettest day of August 2026 in Chicago, IL: 1.85 in on Saturday 1 August 2026.