Station information
- Integrated Surface Dataset (ISD) station ID: 997338
- Country: US
- State: IL
- Latitude: 42.0
- Longitude: -87.5
High Temperatures
On August 11 in CHICAGO the average high temperature is 78.7 °F (26.0 °C). The lowest recored high temperature was 68.2 °F (20.1 °C) in 2008 and the highest recored high temperature was 90.0 °F (32.2 °C) in 2025. The high temperature is usually* between 74.4 °F (23.6 °C) and 83.0 °F (28.3 °C). About a quarter of the time, the high temperature is less than 74.4 °F (23.6 °C), and another quarter of the time, the high temperature is greater than and 83.0 °F (28.3 °C). About 95% of the time, the high temperature has been between 66.3 °F (19.0 °C) and 91.2 °F (32.9 °C).
Low Temperatures
On August 11 in CHICAGO the average low temperature is 70.3 °F (21.3 °C). The lowest recored low temperature was 59.4 °F (15.2 °C) in 2012 and the lowest recored low temperature was 80.2 °F (26.8 °C) in 2025. The low temperature is usually* between 67.1 °F (19.5 °C) and 73.6 °F (23.1 °C). About a quarter of the time, the low temperature is less than 67.1 °F (19.5 °C), and another quarter of the time, the low temperature is greater than and 73.6 °F (23.1 °C). About 95% of the time, the low temperature has been between 60.9 °F (16.1 °C) and 79.8 °F (26.6 °C).
Frost
On August 11 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.
Data Source(s)
The data used to compute the average high/low temperatures for this location were taken from the following stations:
- CHICAGO — Integrated Surface Dataset (ISD) station ID: 997338 — from year 2005 to 2025