St. Charles Average Temperature by Month

This page shows the average temperature in each month of the year in St. Charles, Missouri. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in St. Charles?
In St. Charles, Missouri, the warmest month is July, with an average daily high temperature of 87.1 °F and an average low of 67.4 °F.
What's the Coldest Month in St. Charles?
In St. Charles, Missouri, the coolest month is January, with an average daily high temperature of 39.0 °F and an average low of 22.1 °F.
Month Avg. High Avg. Low
January 39.0 °F 22.1 °F
February 45.0 °F 25.6 °F
March 55.1 °F 33.7 °F
April 66.2 °F 43.7 °F
May 75.0 °F 54.2 °F
June 83.7 °F 63.9 °F
July 87.1 °F 67.4 °F
August 86.4 °F 65.2 °F
September 80.1 °F 57.3 °F
October 68.5 °F 45.2 °F
November 54.4 °F 34.3 °F
December 43.6 °F 26.0 °F
Year 65.5 °F 44.8 °F
Weather Station Details
Years Station Coordinates
1893–2024 St. Charles Elm Point location
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