Annual mean 11°C · wettest around May · prevailing wind SW
Warmest
27.6 °C
Coldest
-3.3 °C
Wettest
38%
Windiest
6.1 m/s
Prevailing
SW
4.9 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 St. Charles over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C. St. Charles has no sharply defined rainy season: the chance of rain on a given day runs from 28% in February, the driest month, to 33% in May, the wettest. Winds in St. Charles are highest in March, averaging 4.7 m/s (17 km/h), and lightest in August, at 2.8 m/s (10 km/h). The prevailing wind is from the SW. The clearest skies in St. Charles come in August, when the sky is typically 40% covered; January is the cloudiest month, at 64%.
Month by month St. Charles 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
-3°C
-5°C
-9°C
30%
64%
4.4 m/s
0
0
1
February
1°C
-4°C
-5°C
28%
54%
4.6 m/s
1
0
8
March
7°C
1°C
1°C
33%
56%
4.7 m/s
3
0
20
April
12°C
6°C
7°C
32%
56%
4.7 m/s
19
1
46
May
19°C
13°C
16°C
33%
52%
4.0 m/s
51
13
62
June
26°C
19°C
24°C
32%
42%
3.6 m/s
60
42
37
July
27°C
20°C
28°C
32%
41%
2.9 m/s
49
59
18
August
26°C
19°C
26°C
31%
40%
2.8 m/s
56
54
24
September
24°C
15°C
22°C
31%
42%
3.1 m/s
67
32
51
October
16°C
9°C
12°C
33%
50%
3.7 m/s
35
4
60
November
7°C
2°C
2°C
31%
52%
4.1 m/s
6
0
25
December
2°C
-2°C
-4°C
32%
61%
4.3 m/s
0
0
6
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. Charles weather by season
Year round, St. Charles has days of about -3°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -5°C to 20°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around May and least likely around February. 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. Charles weather in winterDecember to February
High -0°CLow -4°CRain 30%
Winter in St. Charles has typical daily highs of about -0°C and lows of about -4°C, with a 30% chance of rain on a given day.
St. Charles weather in springMarch to May
High 13°CLow 6°CRain 33%
Spring in St. Charles has typical daily highs of about 13°C and lows of about 6°C, with a 33% chance of rain on a given day.
St. Charles weather in summerJune to August
High 26°CLow 19°CRain 32%
Summer in St. Charles has typical daily highs of about 26°C and lows of about 19°C, with a 32% chance of rain on a given day.
St. Charles weather in autumnSeptember to November
High 16°CLow 9°CRain 32%
Autumn in St. Charles has typical daily highs of about 16°C and lows of about 9°C, with a 32% chance of rain on a given day.
When is the rainy season in St. Charles?
St. Charles has no sharply defined rainy season: the chance of rain on a given day runs from 28% in February, the driest month, to 33% in May, the wettest.
What time of year is St. Charles windiest?
Winds in St. Charles are highest in March, averaging 4.7 m/s (17 km/h), and lightest in August, at 2.8 m/s (10 km/h). The prevailing wind is from the SW.
What is the average temperature in St. Charles year round?
The average temperature in St. Charles over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C.