Annual mean 14°C · wettest around April · prevailing wind SW
Warmest
29.8 °C
Coldest
0.4 °C
Wettest
48%
Windiest
5.3 m/s
Prevailing
SW
3.9 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 Lake 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. Lake St. Louis has no sharply defined rainy season: the chance of rain on a given day runs from 41% in September, the driest month, to 49% in April, the wettest. Winds in Lake St. Louis are highest in March, averaging 3.8 m/s (14 km/h), and lightest in July, at 1.9 m/s (7 km/h). The prevailing wind is from the SW. The clearest skies in Lake St. Louis come in June, when the sky is typically 25% covered; January is the cloudiest month, at 51%.
Month by month Lake 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
45%
51%
3.3 m/s
1
0
10
February
6°C
-0°C
1°C
45%
43%
3.3 m/s
8
0
27
March
11°C
5°C
7°C
49%
46%
3.8 m/s
15
0
44
April
17°C
9°C
13°C
49%
39%
3.7 m/s
40
5
61
May
23°C
15°C
21°C
49%
39%
2.9 m/s
60
31
51
June
28°C
21°C
29°C
46%
25%
2.4 m/s
39
57
15
July
30°C
22°C
32°C
46%
27%
1.9 m/s
16
52
4
August
28°C
20°C
30°C
46%
29%
1.9 m/s
32
56
10
September
26°C
16°C
26°C
41%
26%
2.0 m/s
53
53
28
October
19°C
10°C
16°C
45%
37%
2.7 m/s
50
16
61
November
11°C
4°C
7°C
46%
37%
2.9 m/s
18
1
48
December
6°C
1°C
1°C
46%
44%
3.1 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 Lake St. Louis weather by season
Year round, Lake 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.
Lake St. Louis weather in winterDecember to February
High 4°CLow -1°CRain 45%
Winter in Lake St. Louis has typical daily highs of about 4°C and lows of about -1°C, with a 45% chance of rain on a given day.
Lake St. Louis weather in springMarch to May
High 17°CLow 10°CRain 49%
Spring in Lake St. Louis has typical daily highs of about 17°C and lows of about 10°C, with a 49% chance of rain on a given day.
Lake St. Louis weather in summerJune to August
High 29°CLow 21°CRain 46%
Summer in Lake St. Louis has typical daily highs of about 29°C and lows of about 21°C, with a 46% chance of rain on a given day.
Lake St. Louis weather in autumnSeptember to November
High 19°CLow 10°CRain 44%
Autumn in Lake St. Louis has typical daily highs of about 19°C and lows of about 10°C, with a 44% chance of rain on a given day.
When is the rainy season in Lake St. Louis?
Lake St. Louis has no sharply defined rainy season: the chance of rain on a given day runs from 41% in September, the driest month, to 49% in April, the wettest.
What time of year is Lake St. Louis windiest?
Winds in Lake St. Louis are highest in March, averaging 3.8 m/s (14 km/h), and lightest in July, at 1.9 m/s (7 km/h). The prevailing wind is from the SW.
What is the average temperature in Lake St. Louis year round?
The average temperature in Lake 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.