August - CHICAGO - Weather History and Averages

High Temperatures

On average, the day in August with the warmest high temperature in CHICAGO is August 2 at an average of 79.7 °F (26.5 °C).

On average, the day in August with the coldest high temperature in CHICAGO is August 14 at an average of 76.6 °F (24.8 °C).

The warmest recorded high temperature in August in CHICAGO was 97.3 °F (36.3 °C) on August 24 in the year 2023 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

The coldest recorded high temperature in August in CHICAGO was 61.0 °F (16.1 °C) on August 22 in the year 2009 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

On average, the day in August with the warmest low temperature in CHICAGO is August 2 at an average of 71.6 °F (22.0 °C).

On average, the day in August with the coldest low temperature in CHICAGO is August 31 at an average of 68.2 °F (20.1 °C).

The warmest recorded low temperature in CHICAGO was 83.7 °F (28.7 °C) on August 16 in the year 2025 at CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 .

The coldest recorded low temperature in CHICAGO was 54.1 °F (12.3 °C) on August 30 in the year 2009 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: