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Typical weather in Chicago, IL (Illinois), USA on August 31

High Temperatures

On August 31 in Chicago, IL (Illinois), USA the average high temperature is 80.8 °F (27.1 °C). The lowest recored high temperature was 61.3 °F (16.3 °C) in 2009 and the highest recored high temperature was 99.0 °F (37.2 °C) in 1953. The high temperature is usually* between 75.9 °F (24.4 °C) and 85.8 °F (29.9 °C). About a quarter of the time, the high temperature is less than 75.9 °F (24.4 °C), and another quarter of the time, the high temperature is greater than and 85.8 °F (29.9 °C). About 95% of the time, the high temperature has been between 66.4 °F (19.1 °C) and 95.3 °F (35.2 °C).

Low Temperatures

On August 31 in Chicago, IL (Illinois), USA the average low temperature is 64.0 °F (17.8 °C). The lowest recored low temperature was 46.0 °F (7.8 °C) in 1967 and the lowest recored low temperature was 84.0 °F (28.9 °C) in 1977. The low temperature is usually* between 59.5 °F (15.3 °C) and 68.6 °F (20.3 °C). About a quarter of the time, the low temperature is less than 59.5 °F (15.3 °C), and another quarter of the time, the low temperature is greater than and 68.6 °F (20.3 °C). About 95% of the time, the low temperature has been between 51.0 °F (10.5 °C) and 77.1 °F (25.1 °C).

Frost

On August 31 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: