St. Louis - Recent September Temperatures and Rainfall





The numbers here describe what the September weather in St. Louis, Missouri was like for every year since 2010. A series of tables gives September data by year for temperature and precipitation.

They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. That's followed by how many really hot days occurred each September. Then there's information on how much rain actually landed this month during recent years, as well as how often St. Louis had wet weather.

The climate data come from weather measurements made at St. Louis Lambert International Airport.

Temperature Weather iconTemperature

September temperature averages by year in St. Louis
High °F Low °F Year High °C Low °C
85 65 2018 29 18
84 62 2017 29 17
85 66 2016 29 19
85 65 2015 29 19
80 60 2014 27 15
84 64 2013 29 18
79 60 2012 26 16
77 58 2011 25 14
81 61 2010 27 16
Number of days in September when the temperature in St. Louis rose to at least 70 or 90 degrees Fahrenheit
Year 70 °F
21 °C
90 °F
32 °C
2018 30 12
2017 30 9
2016 29 10
2015 30 10
2014 25 2
2013 30 6
2012 26 3
2011 23 5
2010 27 6

Rainy Weather iconRain

This table gives the total precipitation that fell on St. Louis during September in each year from 2010. The number of days with precipitation counts the days when rainfall amounted to 0.01 inches (0.3 millimeters) or more.

Total rainfall for September in St. Louis
Days Year Inches Milli­metres
5 2018 2.0 51
4 2017 0.3 7
9 2016 5.0 126
5 2015 3.1 79
9 2014 4.2 107
7 2013 2.7 70
11 2012 3.0 77
9 2011 3.2 81
13 2010 3.7 95
Reference

Jay Lawrimore. 2016. Global Summary of the Month, Version 1.0. NOAA National Centers for Environmental Information. 

St. Louis - Recent Years
St. Louis - Extremes
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