Measurements:
°C
°F
CURRENT WEATHER
16:21
Charlestown
54°F
NE 7 mph
Feels like: 52°F
Precip: 67%
World Resorts USA Charlestown Weather

7 Day Weather Forecast

05.14
thu
DAY
54°F
NW 7 mph
precip
0%
NIGHT
52°F
NE 3 mph
precip
0%
05.15
fri
DAY
56°F
SE 2 mph
precip
100%
NIGHT
52°F
S 6 mph
precip
88%
05.16
sat
DAY
56°F
NE 13 mph
precip
0%
NIGHT
54°F
NE 16 mph
precip
0%
05.17
sun
DAY
64°F
NE 11 mph
precip
0%
NIGHT
60°F
E 6 mph
precip
0%
05.18
mon
DAY
60°F
W 11 mph
precip
0%
NIGHT
54°F
N 5 mph
precip
0%
05.19
tue
DAY
62°F
NE 9 mph
precip
0%
NIGHT
60°F
NE 15 mph
precip
0%
05.20
wed
DAY
64°F
NE 15 mph
precip
0%
NIGHT
60°F
SE 8 mph
precip
0%

Charlestown Sea Water Temperature in May, °F

Select Year: 2025 2024 2023

The average sea surface temperature in May 2025 for Charlestown was 11.4°F. The maximum and minimum values were 8.6°F and 13.1°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 79.6 °F
August 78.4 °F
September 72.1 °F
Warmest sea temperature:
August 73.1 °F
July 71.7 °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
May 3 days
The most windy months:
January 13 mph
December 13 mph
March 12 mph
more details