Current sea water temperature:
+43.0°F
| Minimum sea water temperature in December: | 54.1°F |
| Maximum sea water temperature in December: | 42.8°F |
| Average sea water temperature in December: | 48.7°F |
| more information | |
14 days
forecast
forecast
| Charlestown |
monthly
weather
weather
| Charlestown |
Sea water temperature for the last 10 days:
| December 30 | 43.0°F | December 25 | 43.5°F |
| December 29 | 42.8°F | December 24 | 44.2°F |
| December 28 | 43.0°F | December 23 | 44.4°F |
| December 27 | 43.3°F | December 22 | 44.8°F |
| December 26 | 43.3°F | December 21 | 45.0°F |
Monthly sea water temperature, °F
When is the warmest sea in Charlestown?
Based on the data about daily sea water temperature for the last three years the warmest sea in Charlestown was noticed in August, July and September.
Monthly Sea Temperatures in Charlestown, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 69.6°F. The highest and lowest sea temperatures during the month were 72.0°F and 67.8°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 69.1°F. The highest and lowest sea temperatures during the month were 71.8°F and 65.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 68.1°F. The highest and lowest sea temperatures during the month were 69.6°F and 66.7°F.
current
weather
weather
| Charlestown |
weather in
January
January
| Charlestown |
Best time for vacation in Charlestown
Charlestown on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Charlestown
Local time: 15:42
December 30, tuesday
1800
30°F
E
32 mph
32 mph
2100
30°F
E
29 mph
29 mph
December 31, wednesday
0000
30°F
E
28 mph
28 mph
0300
30°F
E
25 mph
25 mph
0600
30°F
E
22 mph
22 mph
0900
30°F
E
21 mph
21 mph
1200
32°F
E
21 mph
21 mph
1500
36°F
E
22 mph
22 mph
