Measurements:
°C
°F
CURRENT WEATHER
17:44
Charlestown
80°F
NE 14 mph
Feels like: 84°F
Precip: 8%
World Resorts USA Charlestown Weather

7 Day Weather Forecast

08.25
tue
DAY
78°F
E 16 mph
precip
7%
NIGHT
72°F
SE 7 mph
precip
8%
08.26
wed
DAY
76°F
E 11 mph
precip
4%
NIGHT
72°F
E 10 mph
precip
23%
08.27
thu
DAY
78°F
N 11 mph
precip
16%
NIGHT
72°F
NW 8 mph
precip
30%
08.28
fri
DAY
78°F
NE 8 mph
precip
8%
NIGHT
74°F
SE 11 mph
precip
24%
08.29
sat
DAY
74°F
NE 3 mph
precip
14%
NIGHT
70°F
NE 6 mph
precip
18%
08.30
sun
DAY
76°F
NE 9 mph
precip
8%
NIGHT
70°F
NW 5 mph
precip
37%
08.31
mon
DAY
78°F
E 7 mph
precip
6%
NIGHT
72°F
SE 5 mph
precip
7%

Charlestown Sea Water Temperature in August, °F

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Charlestown was 21.5°F. The maximum and minimum values were 20.8°F and 22.6°F respectively.

Charlestown on the Weather Map

Best Time to Visit Charlestown
The most sunny months:
November 17 days
September 14 days
October 14 days
The most warm months:
July 78.9 °F
August 78.4 °F
September 72.1 °F
Warmest sea temperature:
August 73.1 °F
July 71.6 °F
September 70.6 °F
The most cold months:
January 35.0 °F
February 35.5 °F
December 41.0 °F
The most rainy months:
October 4 days
November 3 days
January 2 days
The most windy months:
January 13 mph
December 13 mph
March 12 mph
more details