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Typical weather in Chicago, IL (Illinois), USA on September 12

High Temperatures

On September 12 in Chicago, IL (Illinois), USA the average high temperature is 77.3 °F (25.2 °C). The lowest recored high temperature was 55.9 °F (13.3 °C) in 2014 and the highest recored high temperature was 95.0 °F (35.0 °C) in 1952. The high temperature is usually* between 71.9 °F (22.2 °C) and 82.7 °F (28.2 °C). About a quarter of the time, the high temperature is less than 71.9 °F (22.2 °C), and another quarter of the time, the high temperature is greater than and 82.7 °F (28.2 °C). About 95% of the time, the high temperature has been between 61.7 °F (16.5 °C) and 93.0 °F (33.9 °C).

Low Temperatures

On September 12 in Chicago, IL (Illinois), USA the average low temperature is 59.3 °F (15.2 °C). The lowest recored low temperature was 38.3 °F (3.5 °C) in 1964 and the lowest recored low temperature was 74.1 °F (23.4 °C) in 2021. The low temperature is usually* between 54.4 °F (12.4 °C) and 64.3 °F (18.0 °C). About a quarter of the time, the low temperature is less than 54.4 °F (12.4 °C), and another quarter of the time, the low temperature is greater than and 64.3 °F (18.0 °C). About 95% of the time, the low temperature has been between 44.9 °F (7.2 °C) and 73.8 °F (23.2 °C).

Frost

On September 12 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 0.0% of the time.

Data Source(s)

The data used to compute the average high/low temperatures for this location were taken from the following stations: