St Louis Temperatures: Averages by Month
The numbers here tell you how hot and cold the weather usually is in St Louis, Missouri during each month of the year.
The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius.
Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.
To find out how often it rises over 70, 80 or 90 °F each month in St Louis, scroll down farther. There are also monthly and yearly counts of days with cold weather.
The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.
High °F | Low °F | High °C | Low °C | |
---|---|---|---|---|
41 | 24 | January | 5 | -5 |
45 | 27 | February | 7 | -3 |
57 | 38 | March | 14 | 3 |
69 | 48 | April | 21 | 9 |
79 | 60 | May | 26 | 15 |
88 | 69 | June | 31 | 21 |
91 | 73 | July | 33 | 23 |
89 | 70 | August | 32 | 21 |
83 | 63 | September | 28 | 17 |
70 | 50 | October | 21 | 10 |
56 | 37 | November | 13 | 3 |
46 | 30 | December | 8 | -1 |
68 | 49 | Year | 20 | 9 |
High °F | Low °F | High °C | Low °C | |
---|---|---|---|---|
40 | 24 | January | 5 | -5 |
46 | 28 | February | 8 | -2 |
57 | 37 | March | 14 | 3 |
68 | 47 | April | 20 | 8 |
77 | 58 | May | 25 | 14 |
86 | 67 | June | 30 | 20 |
90 | 71 | July | 32 | 22 |
88 | 69 | August | 31 | 21 |
81 | 61 | September | 27 | 16 |
69 | 49 | October | 21 | 10 |
56 | 37 | November | 13 | 3 |
45 | 29 | December | 7 | -2 |
67 | 48 | Year | 19 | 9 |
Days of Hot Weather in St Louis
On its hottest days, St Louis has temperatures in the 100s Fahrenheit (over 37 °C). Three days a year on average get that sweltering. One-hundred degree weather can show up anytime during the summer months.
Temperatures in the 90s F commonly occur here throughout summer. Highs of 90 degrees or more are possible from April to October.
70 °F 21 °C |
80 °F 27 °C |
90 °F 32 °C | |
---|---|---|---|
January | 0 | 0 | 0 |
February | 2 | 0 | 0 |
March | 6 | 1 | 0 |
April | 14 | 5 | 0 |
May | 24 | 14 | 2 |
June | 29 | 25 | 11 |
July | 31 | 29 | 16 |
August | 31 | 29 | 13 |
September | 27 | 17 | 5 |
October | 16 | 6 | 0 |
November | 4 | 0 | 0 |
December | 1 | 0 | 0 |
Year | 184 | 126 | 47 |
How Often St Louis Has Cold Temperatures
The coldest night of the year at St Louis typically drops down to 0 °F (-18 °C) or lower. But just one nights a winter on average gets that brisk.
The city normally has 19 days a year when it never warms up to above freezing. Frosty days can happen from November to March, but are most common in January.
10 °F -12 °C |
20 °F -8 °C |
32 °F 0 °C | |
---|---|---|---|
January | 4 | 11 | 24 |
February | 1 | 7 | 19 |
March | 0 | 2 | 10 |
April | 0 | 0 | 1 |
May | 0 | 0 | 0 |
June | 0 | 0 | 0 |
July | 0 | 0 | 0 |
August | 0 | 0 | 0 |
September | 0 | 0 | 0 |
October | 0 | 0 | 1 |
November | 0 | 1 | 9 |
December | 1 | 6 | 20 |
Year | 7 | 26 | 85 |
References
Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.
NOAA National Centers for Environmental Information (NCEI). Climate Normals.
More on Weather in Missouri
- St Louis Snowfall Totals & Accumulation Averages
- St. Louis Temperatures in Recent Years
- St Louis Temperature Averages by Decade
- Average Temperatures Throughout Missouri
- Precipitation Averages for Places in Missouri
- Days of Sunshine a Year in Missouri
- Missouri Snowfall Averages
- Typical Missouri Humidity Levels