Chicago Weather In September

The record high September temperature in Chicago Illinois for the last 52 years was 99 degrees Fahrenheit, registered on September 7, 1985, and the normal high is 74. The coldest September day in Chicago for the past 52 years was 28 registered on September 5, 1974, and the regular low is 54.

National Weather Service historical Chicago September Weather data indicates that on September 28, 1967, the recorded high did not exceed 47 degrees Fahrenheit, the lowest high measured in Chicago in the past 52 years. Weather Service records also indicate that on September 29, 1971, the low temperature for the day was not measured below 74 degrees, the highest low measured in Chicago in the last 52 years.

NWS data indicates that the daily high temperature in Chicago on September First averages 80 degrees Fahrenheit and the high on the last day of September averages 72 degrees. The low measured temperature in Chicago on September First averages 59 degrees and the low on the last day of the month averages 48 degrees.

Chicago normally receives an average of 3.27 inches of rain during September. September Chicago Weather records indicate that on September 25, 1961 Chicago received 2.88 inches of precipitation, the highest amount of rain recorded in a single day in September.