Chicago · United States

Chicago in October: every year compared

In October, Chicago averages highs of 16.3 °C and lows of 8.3 °C, with 85 mm of precipitation. The warmest October was 1963 (16.6 °C), the coldest 1987 (8.7 °C).

Avg. highAvg. high 16.3 °C

Avg. lowAvg. low 8.3 °C

PrecipitationPrecipitation 85 mm

Rainy daysRainy days 10

Day by day through October

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

Normal high and low, day by dayNormal 1991–2020

Every October in Chicago, ranked

86 months of October since 1940. The last one, 2025, ranks 13 of 86 (+2.0 °C vs normal).

194019832025

2025 · 14.2 °C · +2.0 °C vs normal · rank 13 of 86

Warmest years

1196316.6 °C
2200715.8 °C
3194715.7 °C
4197115.6 °C
5202115.2 °C

Coldest years

119888.7 °C
219878.7 °C
319768.9 °C
419529.1 °C
519809.6 °C

All 86 years in a table

Year	Mean temperature	Daytime highs	Night lows	Precipitation	Hot days (30 °C+)	Frost days	Snowfall	Rainy days
2025	14.2 °C	18.1 °C	10.6 °C	98 mm	0 days	0 days	0 cm	7 days
2024	14.8 °C	20.2 °C	9.7 °C	42 mm	0 days	0 days	0 cm	7 days
2023	13.2 °C	16.8 °C	9.7 °C	109 mm	0 days	1 day	0 cm	15 days
2022	11.8 °C	16.6 °C	7.1 °C	65 mm	0 days	0 days	0 cm	11 days
2021	15.2 °C	18.4 °C	12.1 °C	188 mm	0 days	0 days	0 cm	15 days
2020	10.7 °C	15.2 °C	6.4 °C	73 mm	0 days	0 days	1 cm	12 days
2019	11.3 °C	15.1 °C	7.6 °C	195 mm	0 days	1 day	7 cm	13 days
2018	11.7 °C	15.7 °C	7.9 °C	109 mm	0 days	1 day	0 cm	15 days
2017	14.1 °C	18.0 °C	10.6 °C	149 mm	0 days	0 days	0 cm	10 days
2016	14.7 °C	18.4 °C	10.7 °C	66 mm	0 days	0 days	0 cm	7 days
2015	12.7 °C	16.5 °C	9.1 °C	50 mm	0 days	0 days	0 cm	8 days
2014	11.8 °C	15.5 °C	8.2 °C	151 mm	0 days	0 days	1 cm	10 days
2013	12.2 °C	16.6 °C	8.1 °C	71 mm	0 days	2 days	0 cm	10 days
2012	11.3 °C	15.0 °C	7.4 °C	91 mm	0 days	0 days	0 cm	13 days
2011	12.7 °C	17.4 °C	8.2 °C	71 mm	0 days	0 days	0 cm	9 days
2010	13.5 °C	18.3 °C	8.9 °C	61 mm	0 days	0 days	0 cm	7 days
2009	9.9 °C	12.8 °C	7.0 °C	178 mm	0 days	0 days	0 cm	18 days
2008	11.8 °C	15.8 °C	8.1 °C	68 mm	0 days	0 days	0 cm	9 days
2007	15.8 °C	20.0 °C	11.7 °C	70 mm	3 days	0 days	0 cm	12 days
2006	10.0 °C	14.0 °C	6.1 °C	84 mm	0 days	3 days	0 cm	9 days
2005	13.4 °C	17.4 °C	9.7 °C	32 mm	0 days	0 days	0 cm	8 days
2004	12.5 °C	16.3 °C	8.7 °C	55 mm	0 days	0 days	0 cm	9 days
2003	11.7 °C	16.2 °C	7.2 °C	48 mm	0 days	0 days	0 cm	7 days
2002	10.5 °C	13.9 °C	7.1 °C	37 mm	0 days	0 days	0 cm	8 days
2001	11.7 °C	15.2 °C	8.2 °C	151 mm	0 days	1 day	0 cm	13 days
2000	13.9 °C	18.1 °C	9.8 °C	42 mm	0 days	0 days	0 cm	7 days
1999	12.0 °C	16.5 °C	7.7 °C	35 mm	0 days	0 days	0 cm	4 days
1998	13.0 °C	16.9 °C	9.2 °C	117 mm	0 days	0 days	0 cm	11 days
1997	12.4 °C	16.8 °C	8.1 °C	52 mm	0 days	2 days	0 cm	7 days
1996	12.0 °C	16.3 °C	7.7 °C	54 mm	0 days	1 day	0 cm	8 days
1995	12.7 °C	16.9 °C	8.7 °C	78 mm	0 days	0 days	0 cm	11 days
1994	13.1 °C	17.0 °C	9.3 °C	72 mm	0 days	0 days	0 cm	4 days
1993	10.7 °C	15.0 °C	6.7 °C	55 mm	0 days	0 days	0 cm	8 days
1992	11.0 °C	15.4 °C	6.9 °C	33 mm	0 days	2 days	1 cm	6 days
1991	12.3 °C	16.6 °C	8.5 °C	190 mm	0 days	0 days	0 cm	13 days
1990	11.4 °C	16.4 °C	7.0 °C	114 mm	0 days	0 days	0 cm	8 days
1989	12.2 °C	17.2 °C	7.8 °C	70 mm	0 days	0 days	8 cm	9 days
1988	8.7 °C	12.6 °C	5.1 °C	63 mm	0 days	3 days	0 cm	8 days
1987	8.7 °C	13.3 °C	4.7 °C	47 mm	0 days	2 days	0 cm	11 days
1986	12.4 °C	16.3 °C	8.8 °C	134 mm	0 days	0 days	0 cm	10 days
1985	12.6 °C	16.2 °C	9.1 °C	116 mm	0 days	0 days	0 cm	13 days
1984	13.9 °C	17.9 °C	10.6 °C	78 mm	0 days	0 days	0 cm	13 days
1983	12.5 °C	16.6 °C	8.9 °C	66 mm	0 days	0 days	0 cm	7 days
1982	12.9 °C	17.6 °C	8.9 °C	50 mm	0 days	1 day	0 cm	7 days
1981	10.4 °C	14.6 °C	6.4 °C	61 mm	0 days	2 days	0 cm	8 days
1980	9.6 °C	13.7 °C	5.8 °C	48 mm	0 days	4 days	2 cm	9 days
1979	11.7 °C	15.4 °C	7.8 °C	79 mm	0 days	1 day	0 cm	12 days
1978	11.0 °C	15.2 °C	7.3 °C	48 mm	0 days	0 days	0 cm	7 days
1977	10.7 °C	14.7 °C	7.1 °C	90 mm	0 days	0 days	0 cm	14 days
1976	8.9 °C	13.0 °C	5.0 °C	71 mm	0 days	3 days	0 cm	10 days
1975	13.1 °C	18.4 °C	8.3 °C	25 mm	0 days	0 days	0 cm	6 days
1974	11.7 °C	16.4 °C	7.2 °C	51 mm	0 days	1 day	0 cm	11 days
1973	14.4 °C	18.6 °C	10.6 °C	90 mm	0 days	0 days	0 cm	10 days
1972	10.2 °C	14.0 °C	6.9 °C	94 mm	0 days	2 days	2 cm	12 days
1971	15.6 °C	20.1 °C	11.8 °C	44 mm	0 days	0 days	0 cm	8 days
1970	12.7 °C	16.6 °C	8.8 °C	108 mm	0 days	0 days	0 cm	10 days
1969	11.1 °C	15.5 °C	6.9 °C	139 mm	0 days	2 days	0 cm	11 days
1968	12.5 °C	16.9 °C	8.3 °C	32 mm	0 days	0 days	0 cm	8 days
1967	11.1 °C	15.0 °C	7.4 °C	139 mm	0 days	1 day	13 cm	12 days
1966	11.1 °C	16.3 °C	6.6 °C	49 mm	0 days	1 day	0 cm	7 days
1965	11.7 °C	16.0 °C	8.0 °C	62 mm	0 days	1 day	0 cm	10 days
1964	10.0 °C	15.5 °C	5.1 °C	13 mm	0 days	1 day	0 cm	4 days
1963	16.6 °C	22.5 °C	11.7 °C	18 mm	1 day	0 days	0 cm	4 days
1962	13.2 °C	17.6 °C	9.5 °C	67 mm	0 days	2 days	0 cm	10 days
1961	12.5 °C	16.9 °C	8.6 °C	88 mm	0 days	0 days	0 cm	11 days
1960	12.3 °C	16.8 °C	8.0 °C	58 mm	0 days	1 day	0 cm	8 days
1959	10.6 °C	14.2 °C	7.4 °C	130 mm	0 days	1 day	1 cm	14 days
1958	13.1 °C	17.8 °C	9.1 °C	52 mm	0 days	0 days	0 cm	6 days
1957	10.6 °C	14.4 °C	6.9 °C	92 mm	0 days	1 day	1 cm	8 days
1956	14.9 °C	20.2 °C	10.3 °C	16 mm	0 days	0 days	0 cm	2 days
1955	12.6 °C	17.0 °C	8.7 °C	112 mm	0 days	0 days	0 cm	13 days
1954	12.3 °C	16.1 °C	8.6 °C	120 mm	0 days	2 days	0 cm	14 days
1953	14.3 °C	19.7 °C	9.8 °C	31 mm	0 days	0 days	0 cm	4 days
1952	9.1 °C	14.3 °C	3.8 °C	14 mm	0 days	4 days	0 cm	1 day
1951	12.6 °C	16.7 °C	8.5 °C	81 mm	0 days	0 days	0 cm	6 days
1950	14.3 °C	18.9 °C	9.8 °C	22 mm	0 days	0 days	0 cm	4 days
1949	13.8 °C	18.1 °C	9.5 °C	72 mm	0 days	1 day	0 cm	9 days
1948	10.5 °C	15.0 °C	6.3 °C	29 mm	0 days	2 days	0 cm	7 days
1947	15.7 °C	19.7 °C	11.8 °C	73 mm	0 days	0 days	0 cm	5 days
1946	14.4 °C	19.1 °C	9.9 °C	61 mm	0 days	0 days	0 cm	6 days
1945	10.9 °C	14.4 °C	7.3 °C	39 mm	0 days	0 days	0 cm	7 days
1944	11.8 °C	15.4 °C	8.5 °C	22 mm	0 days	0 days	0 cm	4 days
1943	11.5 °C	15.1 °C	8.3 °C	58 mm	0 days	0 days	0 cm	10 days
1942	11.9 °C	15.6 °C	8.2 °C	69 mm	0 days	3 days	1 cm	6 days
1941	12.9 °C	16.4 °C	9.1 °C	172 mm	0 days	0 days	0 cm	16 days
1940	12.9 °C	17.0 °C	9.3 °C	52 mm	0 days	0 days	0 cm	8 days

October records

Hottest day

30.6 °C

October 7, 2007 estimate

Nearby station: 34.4 °C on October 6, 1963 measured

Coldest night

-4.5 °C

October 26, 1962 estimate

Nearby station: -6.7 °C on October 20, 1930 measured

Wettest day

57 mm

October 26, 2019 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 October?

Highs average 16.3 °C and lows 8.3 °C. A typical October brings 0 hot days (30 °C or more) and 0 frost days.

Does it rain a lot in Chicago in October?

About 85 mm falls in October, over some 10 days with at least 1 mm. The wettest October was 2019 (195 mm), the driest 1964 (13 mm).

What was the warmest October in Chicago?

1963, with a mean temperature of 16.6 °C. The coldest was 1987 (8.7 °C). The last one, 2025, ranks 13 of 86.