St. Louis Average Temperature by Month

This page shows the average temperature in each month of the year in St. Louis, Missouri. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in St. Louis?
In St. Louis, Missouri, the warmest month is July, with an average daily high temperature of 89.5 °F and an average low of 71.5 °F.
What's the Coldest Month in St. Louis?
In St. Louis, Missouri, the coolest month is January, with an average daily high temperature of 40.4 °F and an average low of 24.3 °F.
Month Avg. High Avg. Low
January 40.4 °F 24.3 °F
February 45.7 °F 28.0 °F
March 56.6 °F 37.1 °F
April 68.0 °F 47.5 °F
May 77.0 °F 58.3 °F
June 85.9 °F 67.5 °F
July 89.5 °F 71.5 °F
August 88.1 °F 69.7 °F
September 81.0 °F 61.3 °F
October 69.1 °F 49.4 °F
November 55.5 °F 37.7 °F
December 44.5 °F 28.8 °F
Year 66.9 °F 48.5 °F
Weather Station Details
Years Station Coordinates
1939–2024 St. Louis International Airport location
1893–1938 St. Louis location