Measurements:
°C
°F
CURRENT WEATHER
14:23
Charlestown
78°F
NE 11 mph
Feels like: 82°F
Precip: 12%
World Resorts USA Charlestown Weather

7 Day Weather Forecast

08.05
wed
DAY
76°F
NE 9 mph
precip
10%
NIGHT
72°F
NE 9 mph
precip
32%
08.06
thu
DAY
80°F
NE 9 mph
precip
12%
NIGHT
76°F
NE 9 mph
precip
20%
08.07
fri
DAY
80°F
NE 10 mph
precip
11%
NIGHT
74°F
E 5 mph
precip
21%
08.08
sat
DAY
78°F
NE 13 mph
precip
9%
NIGHT
72°F
E 9 mph
precip
57%
08.09
sun
DAY
80°F
NE 13 mph
precip
10%
NIGHT
76°F
NE 12 mph
precip
15%
08.10
mon
DAY
80°F
NE 10 mph
precip
10%
NIGHT
76°F
NE 11 mph
precip
23%
08.11
tue
DAY
78°F
E 14 mph
precip
11%
NIGHT
72°F
W 7 mph
precip
14%

Charlestown Sea Water Temperature in August, °F

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Charlestown was 20.9°F. The maximum and minimum values were 19.9°F and 22.2°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