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Typical weather in Chicago, IL (Illinois), USA on September 15

High Temperatures

On September 15 in Chicago, IL (Illinois), USA the average high temperature is 74.9 °F (23.8 °C). The lowest recored high temperature was 54.0 °F (12.2 °C) in 1993 and the highest recored high temperature was 91.0 °F (32.8 °C) in 1991. The high temperature is usually* between 69.7 °F (20.9 °C) and 80.1 °F (26.7 °C). About a quarter of the time, the high temperature is less than 69.7 °F (20.9 °C), and another quarter of the time, the high temperature is greater than and 80.1 °F (26.7 °C). About 95% of the time, the high temperature has been between 59.7 °F (15.4 °C) and 90.1 °F (32.3 °C).

Low Temperatures

On September 15 in Chicago, IL (Illinois), USA the average low temperature is 57.6 °F (14.2 °C). The lowest recored low temperature was 39.0 °F (3.9 °C) in 2007 and the lowest recored low temperature was 75.0 °F (23.9 °C) in 1991. The low temperature is usually* between 52.4 °F (11.3 °C) and 62.8 °F (17.1 °C). About a quarter of the time, the low temperature is less than 52.4 °F (11.3 °C), and another quarter of the time, the low temperature is greater than and 62.8 °F (17.1 °C). About 95% of the time, the low temperature has been between 42.5 °F (5.8 °C) and 72.8 °F (22.7 °C).

Frost

On September 15 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: