August 21 - CHICAGO - Weather History and Averages

Station: CHICAGO (2005 to 2025)
Country: US
State: IL
Latitude: 42.0
Longitude: -87.5

High Temperatures

On August 21 in CHICAGO the average high temperature is 77.8 °F (25.5 °C). The lowest recored high temperature was 71.2 °F (21.8 °C) in 2012 and the highest recored high temperature was 86.4 °F (30.2 °C) in 2013. The high temperature is usually^* between 74.4 °F (23.6 °C) and 81.2 °F (27.4 °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 81.2 °F (27.4 °C). About 95% of the time, the high temperature has been between 67.9 °F (20.0 °C) and 87.7 °F (31.0 °C).

Low Temperatures

On August 21 in CHICAGO the average low temperature is 68.8 °F (20.4 °C). The lowest recored low temperature was 58.6 °F (14.8 °C) in 2009 and the lowest recored low temperature was 76.5 °F (24.7 °C) in 2021. The low temperature is usually^* between 65.9 °F (18.9 °C) and 71.6 °F (22.0 °C). About a quarter of the time, the low temperature is less than 65.9 °F (18.9 °C), and another quarter of the time, the low temperature is greater than and 71.6 °F (22.0 °C). About 95% of the time, the low temperature has been between 60.6 °F (15.9 °C) and 77.0 °F (25.0 °C).

Frost

On August 21 in CHICAGO expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.

^{Usually* in this context means around 50% of the
time, assuming a normal distribution of values.}

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 2024

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