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

High Temperatures

On July 31 in Chicago, IL (Illinois), USA, the average high temperature is 82.8 °F (28.2 °C). The lowest recored high temperature was 66.4 °F (19.1 °C) in 1947 and the highest recored high temperature was 99.0 °F (37.2 °C) in 2006. The high temperature is usually* between 78.3 °F (25.7 °C) and 87.3 °F (30.7 °C). About a quarter of the time, the high temperature is less than 78.3 °F (25.7 °C), and another quarter of the time, the high temperature is greater than and 87.3 °F (30.7 °C). About 95% of the time, the high temperature has been between 69.8 °F (21.0 °C) and 95.8 °F (35.5 °C).

Low Temperatures

On July 31 in Chicago, IL (Illinois), USA, the average low temperature is 66.5 °F (19.2 °C). The lowest recored low temperature was 50.0 °F (10.0 °C) in 1984 and the lowest recored low temperature was 82.4 °F (28.0 °C) in 1999. The low temperature is usually* between 62.4 °F (16.9 °C) and 70.7 °F (21.5 °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 70.7 °F (21.5 °C). About 95% of the time, the low temperature has been between 54.5 °F (12.5 °C) and 78.6 °F (25.9 °C).

Frost

On July 31 in Chicago, IL (Illinois), USA, 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: