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Typical weather in Chicago, IL (Illinois), USA on September 25

High Temperatures

On September 25 in Chicago, IL (Illinois), USA the average high temperature is 71.7 °F (22.1 °C). The lowest recored high temperature was 51.1 °F (10.6 °C) in 1947 and the highest recored high temperature was 93.0 °F (33.9 °C) in 2017. The high temperature is usually* between 66.5 °F (19.2 °C) and 77.0 °F (25.0 °C). About a quarter of the time, the high temperature is less than 66.5 °F (19.2 °C), and another quarter of the time, the high temperature is greater than and 77.0 °F (25.0 °C). About 95% of the time, the high temperature has been between 56.5 °F (13.6 °C) and 87.0 °F (30.5 °C).

Low Temperatures

On September 25 in Chicago, IL (Illinois), USA the average low temperature is 53.9 °F (12.2 °C). The lowest recored low temperature was 35.1 °F (1.7 °C) in 1989 and the lowest recored low temperature was 73.8 °F (23.2 °C) in 2007. The low temperature is usually* between 48.3 °F (9.1 °C) and 59.6 °F (15.3 °C). About a quarter of the time, the low temperature is less than 48.3 °F (9.1 °C), and another quarter of the time, the low temperature is greater than and 59.6 °F (15.3 °C). About 95% of the time, the low temperature has been between 37.6 °F (3.1 °C) and 70.2 °F (21.2 °C).

Frost

On September 25 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 0.4% 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: