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Typical weather in Chicago, IL (Illinois), USA on September 30

High Temperatures

On September 30 in Chicago, IL (Illinois), USA the average high temperature is 70.9 °F (21.6 °C). The lowest recored high temperature was 50.4 °F (10.2 °C) in 1947 and the highest recored high temperature was 91.9 °F (33.3 °C) in 1971. The high temperature is usually* between 65.1 °F (18.4 °C) and 76.8 °F (24.9 °C). About a quarter of the time, the high temperature is less than 65.1 °F (18.4 °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 54.0 °F (12.2 °C) and 87.9 °F (31.0 °C).

Low Temperatures

On September 30 in Chicago, IL (Illinois), USA the average low temperature is 52.2 °F (11.2 °C). The lowest recored low temperature was 28.9 °F (-1.7 °C) in 1984 and the lowest recored low temperature was 72.9 °F (22.7 °C) in 1995. The low temperature is usually* between 46.6 °F (8.1 °C) and 57.8 °F (14.4 °C). About a quarter of the time, the low temperature is less than 46.6 °F (8.1 °C), and another quarter of the time, the low temperature is greater than and 57.8 °F (14.4 °C). About 95% of the time, the low temperature has been between 36.0 °F (2.2 °C) and 68.5 °F (20.3 °C).

Frost

On September 30 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: