Current sea water temperature:
+40.8°F
| Minimum sea water temperature in January: | 47.5°F |
| Maximum sea water temperature in January: | 39.4°F |
| Average sea water temperature in January: | 43.3°F |
| more information | |
14 days
forecast
forecast
| Charlestown |
monthly
weather
weather
| Charlestown |
Sea water temperature for the last 10 days:
| January 6 | 40.8°F | January 1 | 42.6°F |
| January 5 | 41.2°F | December 31 | 42.6°F |
| January 4 | 41.0°F | December 30 | 43.0°F |
| January 3 | 41.4°F | December 29 | 42.8°F |
| January 2 | 42.3°F | December 28 | 43.0°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: 21:47
January 07, wednesday
0000
39°F
W
9 mph
9 mph
0300
37°F
N
4 mph
4 mph
0600
37°F
NE
11 mph
11 mph
0900
39°F
E
13 mph
13 mph
1200
39°F
E
19 mph
19 mph
1500
41°F
E
17 mph
17 mph
1800
41°F
E
16 mph
16 mph
2100
39°F
E
17 mph
17 mph
