Chicago · United States

Chicago in August: every year compared

In August, Chicago averages highs of 26.7 °C and lows of 19.1 °C, with 95 mm of precipitation. The warmest August was 1995 (26.2 °C), the coldest 1967 (20.2 °C).

Avg. highAvg. high 26.7 °C

Avg. lowAvg. low 19.1 °C

PrecipitationPrecipitation 95 mm

Rainy daysRainy days 11

Day by day through August

Normal high and low for each day of August in Chicago.

Normal high and low, day by dayNormal 1991–2020

Every August in Chicago, ranked

86 months of August since 1940. The last one, 2025, ranks 50 of 86 (−0.5 °C vs normal).

194019832025

2025 · 22.4 °C · −0.5 °C vs normal · rank 50 of 86

Warmest years

1199526.2 °C
2194725.8 °C
3198325.5 °C
4195525.1 °C
5195925.1 °C

Coldest years

1196720.2 °C
2200420.3 °C
3199220.3 °C
4194620.6 °C
5195120.9 °C

All 86 years in a table

Year	Mean temperature	Daytime highs	Night lows	Precipitation	Hot days (30 °C+)	Rainy days
2025	22.4 °C	26.0 °C	18.8 °C	88 mm	6 days	8 days
2024	22.8 °C	27.0 °C	18.8 °C	69 mm	5 days	9 days
2023	22.5 °C	26.2 °C	18.7 °C	54 mm	3 days	10 days
2022	22.9 °C	26.6 °C	19.0 °C	88 mm	3 days	12 days
2021	24.2 °C	28.1 °C	20.4 °C	81 mm	7 days	13 days
2020	23.2 °C	27.2 °C	19.0 °C	29 mm	6 days	6 days
2019	22.3 °C	25.9 °C	18.4 °C	104 mm	1 day	13 days
2018	23.6 °C	27.4 °C	20.0 °C	113 mm	6 days	13 days
2017	21.3 °C	25.2 °C	17.1 °C	76 mm	0 days	12 days
2016	23.9 °C	27.3 °C	20.6 °C	142 mm	3 days	14 days
2015	22.1 °C	25.9 °C	18.1 °C	60 mm	3 days	7 days
2014	22.0 °C	25.8 °C	18.6 °C	110 mm	0 days	13 days
2013	22.8 °C	27.0 °C	18.5 °C	54 mm	5 days	6 days
2012	23.3 °C	27.7 °C	18.5 °C	125 mm	9 days	10 days
2011	23.4 °C	27.2 °C	19.3 °C	112 mm	4 days	13 days
2010	24.8 °C	28.6 °C	20.9 °C	66 mm	9 days	6 days
2009	21.7 °C	25.4 °C	18.3 °C	145 mm	4 days	15 days
2008	22.6 °C	26.6 °C	18.5 °C	67 mm	4 days	9 days
2007	24.3 °C	28.1 °C	20.6 °C	135 mm	11 days	16 days
2006	23.4 °C	26.8 °C	19.8 °C	115 mm	2 days	11 days
2005	24.1 °C	27.9 °C	20.1 °C	47 mm	7 days	9 days
2004	20.3 °C	24.0 °C	16.4 °C	105 mm	1 day	13 days
2003	23.7 °C	27.5 °C	19.9 °C	42 mm	7 days	7 days
2002	23.3 °C	26.8 °C	19.5 °C	126 mm	4 days	12 days
2001	23.6 °C	27.5 °C	19.7 °C	156 mm	7 days	13 days
2000	22.9 °C	26.8 °C	19.2 °C	105 mm	2 days	11 days
1999	21.9 °C	25.3 °C	18.2 °C	78 mm	0 days	10 days
1998	23.6 °C	27.3 °C	20.0 °C	121 mm	3 days	14 days
1997	21.5 °C	25.2 °C	17.9 °C	108 mm	3 days	12 days
1996	23.2 °C	27.0 °C	19.3 °C	43 mm	5 days	7 days
1995	26.2 °C	29.8 °C	22.8 °C	122 mm	16 days	14 days
1994	21.2 °C	25.1 °C	17.2 °C	118 mm	3 days	12 days
1993	23.4 °C	27.2 °C	20.1 °C	100 mm	6 days	12 days
1992	20.3 °C	24.3 °C	16.3 °C	53 mm	2 days	8 days
1991	23.6 °C	27.8 °C	19.6 °C	81 mm	9 days	7 days
1990	22.5 °C	26.4 °C	18.8 °C	226 mm	3 days	13 days
1989	22.4 °C	26.5 °C	18.5 °C	79 mm	3 days	10 days
1988	25.1 °C	29.4 °C	21.1 °C	121 mm	15 days	11 days
1987	22.9 °C	26.7 °C	19.3 °C	200 mm	8 days	15 days
1986	21.0 °C	25.0 °C	16.8 °C	51 mm	0 days	9 days
1985	21.7 °C	25.5 °C	18.2 °C	104 mm	0 days	13 days
1984	24.2 °C	28.7 °C	19.8 °C	31 mm	9 days	9 days
1983	25.5 °C	29.7 °C	21.4 °C	45 mm	15 days	7 days
1982	21.8 °C	25.7 °C	18.0 °C	35 mm	2 days	8 days
1981	22.3 °C	26.2 °C	18.7 °C	106 mm	1 day	15 days
1980	24.2 °C	28.3 °C	20.5 °C	154 mm	11 days	13 days
1979	22.1 °C	25.8 °C	18.5 °C	112 mm	4 days	13 days
1978	23.0 °C	27.1 °C	18.9 °C	76 mm	6 days	9 days
1977	21.7 °C	25.6 °C	18.0 °C	127 mm	1 day	17 days
1976	21.4 °C	26.0 °C	16.7 °C	39 mm	2 days	7 days
1975	23.5 °C	27.1 °C	20.1 °C	142 mm	6 days	15 days
1974	21.8 °C	25.8 °C	17.8 °C	59 mm	3 days	10 days
1973	23.8 °C	28.0 °C	19.8 °C	43 mm	9 days	7 days
1972	22.4 °C	26.3 °C	18.7 °C	116 mm	4 days	15 days
1971	21.5 °C	26.1 °C	17.1 °C	42 mm	6 days	9 days
1970	23.3 °C	27.5 °C	19.1 °C	17 mm	8 days	6 days
1969	23.4 °C	28.1 °C	18.7 °C	18 mm	7 days	2 days
1968	23.4 °C	27.7 °C	19.3 °C	39 mm	10 days	7 days
1967	20.2 °C	24.5 °C	15.8 °C	55 mm	1 day	12 days
1966	21.2 °C	26.0 °C	16.6 °C	61 mm	0 days	6 days
1965	21.1 °C	25.3 °C	17.2 °C	154 mm	5 days	13 days
1964	21.4 °C	26.2 °C	16.8 °C	53 mm	4 days	7 days
1963	21.2 °C	25.7 °C	17.1 °C	51 mm	2 days	7 days
1962	22.5 °C	27.3 °C	18.0 °C	59 mm	8 days	9 days
1961	22.5 °C	26.8 °C	18.6 °C	83 mm	3 days	10 days
1960	22.9 °C	27.1 °C	19.3 °C	92 mm	5 days	10 days
1959	25.1 °C	29.4 °C	21.6 °C	45 mm	15 days	10 days
1958	22.3 °C	26.6 °C	18.3 °C	77 mm	8 days	7 days
1957	22.3 °C	26.6 °C	18.4 °C	61 mm	5 days	10 days
1956	22.6 °C	27.0 °C	18.9 °C	85 mm	3 days	13 days
1955	25.1 °C	29.4 °C	20.9 °C	85 mm	17 days	8 days
1954	22.1 °C	25.9 °C	18.7 °C	95 mm	3 days	14 days
1953	23.8 °C	28.4 °C	19.4 °C	41 mm	11 days	7 days
1952	22.1 °C	26.5 °C	18.1 °C	89 mm	2 days	11 days
1951	20.9 °C	24.8 °C	16.9 °C	130 mm	2 days	11 days
1950	20.9 °C	25.2 °C	16.9 °C	55 mm	2 days	9 days
1949	23.4 °C	27.6 °C	19.4 °C	53 mm	8 days	12 days
1948	23.1 °C	27.5 °C	18.9 °C	62 mm	9 days	6 days
1947	25.8 °C	30.0 °C	21.6 °C	57 mm	19 days	7 days
1946	20.6 °C	24.0 °C	17.3 °C	50 mm	0 days	10 days
1945	22.2 °C	25.9 °C	18.4 °C	34 mm	5 days	10 days
1944	23.4 °C	27.1 °C	19.8 °C	85 mm	11 days	12 days
1943	22.5 °C	26.3 °C	18.8 °C	142 mm	5 days	10 days
1942	22.2 °C	26.1 °C	18.6 °C	72 mm	3 days	10 days
1941	23.0 °C	27.0 °C	18.7 °C	16 mm	6 days	4 days
1940	22.2 °C	25.7 °C	19.0 °C	68 mm	4 days	15 days

August records

Hottest day

36.5 °C

August 19, 1983 estimate

Nearby station: 38.9 °C on August 2, 1991 measured

Coldest night

7.8 °C

August 29, 1965 estimate

Nearby station: 6.1 °C on August 29, 1965 measured

Wettest day

92 mm

August 26, 1987 estimate

The weather on your birthday in Chicago

Any day since 1940: high, low, rain, snow, and how warm it was compared with the same date in every other year.

Questions & answers

How warm is Chicago in August?

Highs average 26.7 °C and lows 19.1 °C. A typical August brings 5 hot days (30 °C or more) and 0 frost days.

Does it rain a lot in Chicago in August?

About 95 mm falls in August, over some 11 days with at least 1 mm. The wettest August was 1990 (226 mm), the driest 1941 (16 mm).

What was the warmest August in Chicago?

1995, with a mean temperature of 26.2 °C. The coldest was 1967 (20.2 °C). The last one, 2025, ranks 50 of 86.