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.

All the numbers are long-term historical averages based on climate data gathered from 1981 to 2010.

Average St Louis temperatures
High °F Low °F   High °C Low °C
40 24 January 4 -5
45 28 February 7 -2
56 37 March 13 3
67 47 April 20 8
76 57 May 25 14
85 67 June 30 19
89 71 July 32 22
88 69 August 31 21
80 61 September 27 16
69 49 October 20 9
56 38 November 13 3
43 27 December 6 -3
66 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). But only two 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.

Days per month in St Louis of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 1 0 0
March 1 1 0
April 13 5 0
May 24 11 1
June 29 24 8
July 31 29 14
August 31 28 11
September 27 16 4
October 14 4 0
November 4 1 0
December 0 0 0
Year 179 118 39

How Often St Louis Has Cold Temperatures

The coldest nights at St Louis drop down to 0 °F (-18 °C) or lower. Two nights a winter on average get that brisk.

The city also typically has 20 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.

Days per month on average in St Louis when the minimum temperature drops to 10, 20, or 32 °F or below
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 4 11 24
February 2 6 18
March 0 1 11
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 3 7 21
Year 9 26 84
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

Missouri Temperatures
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