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Typical weather in Chicago, IL (Illinois), USA on September 18

High Temperatures

On September 18 in Chicago, IL (Illinois), USA the average high temperature is 75.8 °F (24.3 °C). The lowest recored high temperature was 60.1 °F (15.6 °C) in 1981 and the highest recored high temperature was 93.9 °F (34.4 °C) in 1955. The high temperature is usually* between 70.4 °F (21.3 °C) and 81.2 °F (27.3 °C). About a quarter of the time, the high temperature is less than 70.4 °F (21.3 °C), and another quarter of the time, the high temperature is greater than and 81.2 °F (27.3 °C). About 95% of the time, the high temperature has been between 60.0 °F (15.6 °C) and 91.6 °F (33.1 °C).

Low Temperatures

On September 18 in Chicago, IL (Illinois), USA the average low temperature is 58.2 °F (14.6 °C). The lowest recored low temperature was 37.0 °F (2.8 °C) in 1984 and the lowest recored low temperature was 75.9 °F (24.4 °C) in 1988. The low temperature is usually* between 53.2 °F (11.8 °C) and 63.2 °F (17.3 °C). About a quarter of the time, the low temperature is less than 53.2 °F (11.8 °C), and another quarter of the time, the low temperature is greater than and 63.2 °F (17.3 °C). About 95% of the time, the low temperature has been between 43.6 °F (6.5 °C) and 72.8 °F (22.6 °C).

Frost

On September 18 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 0.0% 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: