Annual mean 13°C · wettest around February · prevailing wind SW
Warmest
29.0 °C
Coldest
2.8 °C
Wettest
35%
Windiest
3.9 m/s
Prevailing
SW
3.0 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 Charleston over the whole year is 13°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -1°C. Charleston has no sharply defined rainy season: the chance of rain on a given day runs from 21% in October, the driest month, to 35% in February, the wettest. Winds in Charleston are highest in March, averaging 2.7 m/s (10 km/h), and lightest in August, at 1.3 m/s (5 km/h). The prevailing wind is from the SW. The clearest skies in Charleston come in October, when the sky is typically 47% covered; January is the cloudiest month, at 65%.
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
3°C
-1°C
-1°C
32%
65%
2.5 m/s
4
0
17
February
8°C
2°C
3°C
35%
60%
2.6 m/s
8
0
33
March
12°C
4°C
8°C
31%
53%
2.7 m/s
22
0
51
April
17°C
9°C
14°C
31%
53%
2.5 m/s
46
9
62
May
22°C
14°C
20°C
31%
56%
2.0 m/s
63
29
53
June
26°C
18°C
27°C
31%
48%
1.7 m/s
56
50
27
July
28°C
21°C
30°C
30%
48%
1.4 m/s
26
64
6
August
28°C
19°C
29°C
28%
50%
1.3 m/s
39
62
12
September
25°C
16°C
25°C
24%
47%
1.3 m/s
59
48
34
October
19°C
10°C
17°C
21%
47%
1.6 m/s
56
16
65
November
12°C
4°C
8°C
27%
49%
2.0 m/s
21
1
53
December
7°C
2°C
3°C
31%
61%
2.3 m/s
6
0
31
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 3°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -1°C to 21°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around February 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 6°CLow 1°CRain 33%
Winter in Charleston has typical daily highs of about 6°C and lows of about 1°C, with a 33% chance of rain on a given day.
Charleston weather in springMarch to May
High 17°CLow 9°CRain 31%
Spring in Charleston has typical daily highs of about 17°C and lows of about 9°C, with a 31% chance of rain on a given day.
Charleston weather in summerJune to August
High 27°CLow 19°CRain 30%
Summer in Charleston has typical daily highs of about 27°C and lows of about 19°C, with a 30% chance of rain on a given day.
Charleston weather in autumnSeptember to November
High 19°CLow 10°CRain 24%
Autumn in Charleston has typical daily highs of about 19°C and lows of about 10°C, with a 24% 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 21% in October, the driest month, to 35% in February, the wettest.
What time of year is Charleston windiest?
Winds in Charleston are highest in March, averaging 2.7 m/s (10 km/h), and lightest in August, at 1.3 m/s (5 km/h). The prevailing wind is from the SW.
What is the average temperature in Charleston year round?
The average temperature in Charleston over the whole year is 13°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -1°C.