September - CHICAGO - Weather History and Averages

High Temperatures

On average, the day in September with the warmest high temperature in CHICAGO is September 2 at an average of 77.5 °F (25.3 °C).

On average, the day in September with the coldest high temperature in CHICAGO is September 30 at an average of 67.1 °F (19.5 °C).

The warmest recorded high temperature in September in CHICAGO was 91.8 °F (33.2 °C) on September 1 in the year 2011 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

The coldest recorded high temperature in September in CHICAGO was 53.4 °F (11.9 °C) on September 13 in the year 2014 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

On average, the day in September with the warmest low temperature in CHICAGO is September 1 at an average of 68.7 °F (20.4 °C).

On average, the day in September with the coldest low temperature in CHICAGO is September 30 at an average of 58.1 °F (14.5 °C).

The warmest recorded low temperature in CHICAGO was 81.0 °F (27.2 °C) on September 10 in the year 2013 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

The coldest recorded low temperature in CHICAGO was 43.2 °F (6.2 °C) on September 13 in the year 2014 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

If you would like to see the temperatures for specific days, you can click on the corresponding links below: