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Typical weather in Chicago, IL (Illinois), USA on September 21

High Temperatures

On September 21 in Chicago, IL (Illinois), USA the average high temperature is 73.7 °F (23.2 °C). The lowest recored high temperature was 52.0 °F (11.1 °C) in 1995 and the highest recored high temperature was 95.0 °F (35.0 °C) in 2017. The high temperature is usually* between 67.6 °F (19.8 °C) and 79.8 °F (26.5 °C). About a quarter of the time, the high temperature is less than 67.6 °F (19.8 °C), and another quarter of the time, the high temperature is greater than and 79.8 °F (26.5 °C). About 95% of the time, the high temperature has been between 56.1 °F (13.4 °C) and 91.3 °F (33.0 °C).

Low Temperatures

On September 21 in Chicago, IL (Illinois), USA the average low temperature is 56.7 °F (13.7 °C). The lowest recored low temperature was 33.1 °F (0.6 °C) in 1962 and the lowest recored low temperature was 75.9 °F (24.4 °C) in 1970. The low temperature is usually* between 51.0 °F (10.5 °C) and 62.4 °F (16.9 °C). About a quarter of the time, the low temperature is less than 51.0 °F (10.5 °C), and another quarter of the time, the low temperature is greater than and 62.4 °F (16.9 °C). About 95% of the time, the low temperature has been between 40.2 °F (4.5 °C) and 73.2 °F (22.9 °C).

Frost

On September 21 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 0.2% 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: