Annual mean 19°C · wettest around August · prevailing wind W
Warmest
30.9 °C
Coldest
12.5 °C
Wettest
61%
Windiest
4.6 m/s
Prevailing
W
3.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Charleston over the whole year is 19°C. July is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 7°C. Charleston has no sharply defined rainy season: the chance of rain on a given day runs from 57% in October, the driest month, to 60% in August, the wettest. Winds in Charleston are highest in March, averaging 3.3 m/s (12 km/h), and lightest in August, at 2.5 m/s (9 km/h). The prevailing wind is from the W. The clearest skies in Charleston come in April, when the sky is typically 35% covered; December is the cloudiest month, at 48%.
Month by month Charleston 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
13°C
7°C
10°C
58%
43%
2.7 m/s
24
2
56
February
17°C
10°C
14°C
58%
47%
3.0 m/s
45
6
66
March
19°C
12°C
16°C
57%
43%
3.3 m/s
55
9
67
April
23°C
15°C
21°C
57%
35%
3.3 m/s
71
27
54
May
26°C
20°C
26°C
58%
40%
3.2 m/s
51
54
24
June
29°C
23°C
31°C
60%
42%
2.9 m/s
18
55
4
July
31°C
25°C
34°C
60%
39%
2.6 m/s
4
35
0
August
30°C
24°C
33°C
60%
44%
2.5 m/s
8
41
1
September
28°C
22°C
30°C
59%
43%
2.8 m/s
25
56
9
October
24°C
17°C
24°C
57%
38%
2.6 m/s
61
43
39
November
19°C
12°C
16°C
58%
42%
2.7 m/s
51
12
66
December
15°C
9°C
12°C
59%
48%
2.7 m/s
36
3
62
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 Charleston weather by season
Year round, Charleston has days of about 13°C at their warmest in January, its coolest month, and 31°C in July, its warmest; the coolest hours of the day run from 7°C to 25°C through the year, and the average temperature over the year is 19°C around the clock. Rain is most likely around August and least likely around October. 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.
Charleston weather in winterDecember to February
High 15°CLow 9°CRain 58%
Winter in Charleston has typical daily highs of about 15°C and lows of about 9°C, with a 58% chance of rain on a given day.
Charleston weather in springMarch to May
High 23°CLow 15°CRain 57%
Spring in Charleston has typical daily highs of about 23°C and lows of about 15°C, with a 57% chance of rain on a given day.
Charleston weather in summerJune to August
High 30°CLow 24°CRain 60%
Summer in Charleston has typical daily highs of about 30°C and lows of about 24°C, with a 60% chance of rain on a given day.
Charleston weather in autumnSeptember to November
High 24°CLow 17°CRain 58%
Autumn in Charleston has typical daily highs of about 24°C and lows of about 17°C, with a 58% chance of rain on a given day.
When is the rainy season in Charleston?
Charleston has no sharply defined rainy season: the chance of rain on a given day runs from 57% in October, the driest month, to 60% in August, the wettest.
What time of year is Charleston windiest?
Winds in Charleston are highest in March, averaging 3.3 m/s (12 km/h), and lightest in August, at 2.5 m/s (9 km/h). The prevailing wind is from the W.
What is the average temperature in Charleston year round?
The average temperature in Charleston over the whole year is 19°C. July is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 7°C.