Measurements:
°C
°F
CURRENT WEATHER
11:06
Charleston
88°F
W 15 mph
Feels like: 92°F
Precip: 4%
World Resorts USA Charleston Weather

7 Day Weather Forecast

09.15
tue
DAY
88°F
W 15 mph
precip
4%
NIGHT
78°F
W 8 mph
precip
5%
09.16
wed
DAY
88°F
SW 10 mph
precip
8%
NIGHT
78°F
W 7 mph
precip
15%
09.17
thu
DAY
86°F
SW 9 mph
precip
2%
NIGHT
78°F
W 5 mph
precip
27%
09.18
fri
DAY
90°F
W 7 mph
precip
11%
NIGHT
80°F
N 3 mph
precip
12%
09.19
sat
DAY
90°F
NW 6 mph
precip
18%
NIGHT
82°F
N 6 mph
precip
27%
09.20
sun
DAY
90°F
W 4 mph
precip
22%
NIGHT
82°F
N 5 mph
precip
16%
09.21
mon
DAY
88°F
N 4 mph
precip
22%
NIGHT
80°F
N 6 mph
precip
24%

Charleston Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Charleston was 28.8°F. The maximum and minimum values were 27.9°F and 29.7°F respectively.

Charleston on the Weather Map

Best Time to Visit Charleston
The most sunny months:
April 16 days
May 16 days
October 15 days
The most warm months:
July 93.9 °F
August 91.9 °F
June 90.2 °F
Warmest sea temperature:
August 87.6 °F
July 87.6 °F
September 84.5 °F
The most cold months:
January 56.4 °F
February 61.0 °F
December 61.7 °F
The most rainy months:
August 9 days
July 8 days
September 6 days
The most windy months:
March 9 mph
April 9 mph
February 9 mph
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