Annual mean 14°C · wettest around April · prevailing wind SW
Warmest
29.8 °C
Coldest
0.9 °C
Wettest
30%
Windiest
5.3 m/s
Prevailing
SW
4.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in St. Louis over the whole year is 14°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -2°C. St. Louis has no sharply defined rainy season: the chance of rain on a given day runs from 25% in September, the driest month, to 34% in April, the wettest. Winds in St. Louis are highest in March, averaging 4.0 m/s (14 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in St. Louis come in September, when the sky is typically 30% covered; January is the cloudiest month, at 55%.
Month by month St. Louis climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
2°C
-2°C
-4°C
26%
55%
3.6 m/s
1
0
11
February
6°C
-0°C
1°C
27%
47%
3.6 m/s
7
0
26
March
12°C
5°C
7°C
32%
50%
4.0 m/s
15
0
45
April
17°C
9°C
13°C
34%
45%
3.8 m/s
41
6
62
May
23°C
15°C
21°C
33%
44%
3.1 m/s
61
30
51
June
29°C
21°C
29°C
29%
31%
2.7 m/s
39
56
15
July
30°C
22°C
32°C
30%
33%
2.2 m/s
17
52
4
August
29°C
20°C
30°C
29%
34%
2.1 m/s
32
55
10
September
27°C
17°C
26°C
25%
30%
2.2 m/s
52
53
28
October
19°C
10°C
16°C
28%
38%
2.9 m/s
50
15
62
November
11°C
4°C
7°C
29%
40%
3.1 m/s
18
1
47
December
6°C
1°C
1°C
28%
48%
3.3 m/s
3
0
23
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short St. Louis weather by season
Year round, St. Louis has days of about 2°C at their warmest in January, its coolest month, and 30°C in July, its warmest; the coolest hours of the day run from -2°C to 22°C through the year, and the average temperature over the year is 14°C around the clock. Rain is most likely around April and least likely around September. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
St. Louis weather in winterDecember to February
High 4°CLow -1°CRain 27%
Winter in St. Louis has typical daily highs of about 4°C and lows of about -1°C, with a 27% chance of rain on a given day.
St. Louis weather in springMarch to May
High 17°CLow 10°CRain 33%
Spring in St. Louis has typical daily highs of about 17°C and lows of about 10°C, with a 33% chance of rain on a given day.
St. Louis weather in summerJune to August
High 29°CLow 21°CRain 29%
Summer in St. Louis has typical daily highs of about 29°C and lows of about 21°C, with a 29% chance of rain on a given day.
St. Louis weather in autumnSeptember to November
High 19°CLow 10°CRain 28%
Autumn in St. Louis has typical daily highs of about 19°C and lows of about 10°C, with a 28% chance of rain on a given day.
When is the rainy season in St. Louis?
St. Louis has no sharply defined rainy season: the chance of rain on a given day runs from 25% in September, the driest month, to 34% in April, the wettest.
What time of year is St. Louis windiest?
Winds in St. Louis are highest in March, averaging 4.0 m/s (14 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in St. Louis year round?
The average temperature in St. Louis over the whole year is 14°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -2°C.