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Typical weather in Chicago, IL (Illinois), USA on September 23

High Temperatures

On September 23 in Chicago, IL (Illinois), USA the average high temperature is 71.3 °F (21.8 °C). The lowest recored high temperature was 54.0 °F (12.2 °C) in 1995 and the highest recored high temperature was 95.0 °F (35.0 °C) in 2017. The high temperature is usually* between 65.8 °F (18.8 °C) and 76.8 °F (24.9 °C). About a quarter of the time, the high temperature is less than 65.8 °F (18.8 °C), and another quarter of the time, the high temperature is greater than and 76.8 °F (24.9 °C). About 95% of the time, the high temperature has been between 55.3 °F (13.0 °C) and 87.3 °F (30.7 °C).

Low Temperatures

On September 23 in Chicago, IL (Illinois), USA the average low temperature is 54.0 °F (12.2 °C). The lowest recored low temperature was 28.9 °F (-1.7 °C) in 1995 and the lowest recored low temperature was 75.0 °F (23.9 °C) in 2017. The low temperature is usually* between 48.0 °F (8.9 °C) and 60.0 °F (15.5 °C). About a quarter of the time, the low temperature is less than 48.0 °F (8.9 °C), and another quarter of the time, the low temperature is greater than and 60.0 °F (15.5 °C). About 95% of the time, the low temperature has been between 36.6 °F (2.5 °C) and 71.4 °F (21.9 °C).

Frost

On September 23 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 0.7% 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: