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Typical weather in Chicago, IL (Illinois), USA on August 9

High Temperatures

On August 9 in Chicago, IL (Illinois), USA the average high temperature is 82.7 °F (28.1 °C). The lowest recored high temperature was 64.9 °F (18.3 °C) in 1972 and the highest recored high temperature was 99.0 °F (37.2 °C) in 1988. The high temperature is usually* between 78.4 °F (25.8 °C) and 86.9 °F (30.5 °C). About a quarter of the time, the high temperature is less than 78.4 °F (25.8 °C), and another quarter of the time, the high temperature is greater than and 86.9 °F (30.5 °C). About 95% of the time, the high temperature has been between 70.3 °F (21.3 °C) and 95.0 °F (35.0 °C).

Low Temperatures

On August 9 in Chicago, IL (Illinois), USA the average low temperature is 66.4 °F (19.1 °C). The lowest recored low temperature was 45.0 °F (7.2 °C) in 1964 and the lowest recored low temperature was 81.5 °F (27.5 °C) in 2025. The low temperature is usually* between 62.4 °F (16.9 °C) and 70.3 °F (21.3 °C). About a quarter of the time, the low temperature is less than 62.4 °F (16.9 °C), and another quarter of the time, the low temperature is greater than and 70.3 °F (21.3 °C). About 95% of the time, the low temperature has been between 54.9 °F (12.7 °C) and 77.9 °F (25.5 °C).

Frost

On August 9 in Chicago, IL (Illinois), USA 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: