Rantoul Average Temperature by Month

This page shows the average temperature in each month of the year in Rantoul, Illinois. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Rantoul?
In Rantoul, Illinois, the warmest month is July, with an average daily high temperature of 86.8 °F and an average low of 64.0 °F.
What's the Coldest Month in Rantoul?
In Rantoul, Illinois, the coolest month is January, with an average daily high temperature of 34.1 °F and an average low of 16.3 °F.
Month Avg. High Avg. Low
January 34.1 °F 16.3 °F
February 39.3 °F 19.4 °F
March 50.9 °F 28.9 °F
April 63.7 °F 39.4 °F
May 74.8 °F 51.3 °F
June 84.2 °F 61.2 °F
July 86.8 °F 64.0 °F
August 85.2 °F 61.5 °F
September 80.0 °F 53.7 °F
October 66.8 °F 41.8 °F
November 51.7 °F 30.9 °F
December 39.3 °F 21.8 °F
Year 63.3 °F 41.2 °F
Weather Station Details
Years Station Coordinates
1893–2023 Rantoul location
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