Current sea water temperature:
+46.0°F
| Minimum sea water temperature in December: | 54.1°F |
| Maximum sea water temperature in December: | 43.7°F |
| Average sea water temperature in December: | 49.1°F |
| more information | |
14 days
forecast
forecast
| Charlestown |
monthly
weather
weather
| Charlestown |
Sea water temperature for the last 10 days:
| December 16 | 46.0°F | December 11 | 48.2°F |
| December 15 | 46.9°F | December 10 | 48.6°F |
| December 14 | 47.1°F | December 9 | 48.4°F |
| December 13 | 47.1°F | December 8 | 48.6°F |
| December 12 | 48.0°F | December 7 | 48.9°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
December
December
| Charlestown |
Best time for vacation in Charlestown
Charlestown on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Charlestown
Local time: 09:09
December 16, tuesday
1200
34°F
E
8 mph
8 mph
1500
37°F
E
10 mph
10 mph
1800
41°F
E
11 mph
11 mph
2100
37°F
NE
15 mph
15 mph
December 17, wednesday
0000
37°F
NE
21 mph
21 mph
0300
39°F
NE
23 mph
23 mph
0600
41°F
NE
22 mph
22 mph
0900
46°F
NE
23 mph
23 mph
