Average sea water temperature in September:
+68.5°F
| Minimum sea water temperature in September: | 73.6°F |
| Maximum sea water temperature in September: | 63.7°F |
Daily 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.
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| Charlestown |
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| Charlestown |
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| Charlestown |
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| Charlestown |
Monthly sea water temperature in Charlestown, °F
Which USA resorts have warmest sea in September?
| Place name | September 2025 | September 2024 |
|---|---|---|
| Key West | 86.9°F | 87.4°F |
| Key Largo | 86.6°F | 87.1°F |
| Fort Lauderdale | 86.4°F | 86.4°F |
| Everglades | 86.2°F | 87.0°F |
| West Palm Beach | 86.2°F | 86.4°F |
| Miami Beach | 86.1°F | 86.3°F |
| Naples | 86.1°F | 87.2°F |
| Marco Island | 86.0°F | 87.2°F |
| Hialeah | 85.8°F | 86.0°F |
| Corpus Christi | 85.8°F | 84.7°F |
| Miami | 85.8°F | 86.0°F |
| Galveston | 85.5°F | 83.7°F |
| Cape Coral | 85.2°F | 86.5°F |
| Houston | 84.9°F | 83.4°F |
| Siesta Key | 84.9°F | 86.8°F |
| Sarasota | 84.8°F | 86.7°F |
| Cocoa Beach | 84.6°F | 85.2°F |
| Tampa | 84.3°F | 86.0°F |
| New Orleans | 84.3°F | 82.9°F |
| St. Petersburg | 84.1°F | 86.1°F |
Best time for vacation in Charlestown
Charlestown on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Charlestown
Local time: 09:03
April 09, thursday
1200
39°F
NW
7 mph
7 mph
1500
39°F
N
9 mph
9 mph
1800
43°F
N
9 mph
9 mph
2100
41°F
N
9 mph
9 mph
April 10, friday
0000
39°F
N
9 mph
9 mph
0300
37°F
NE
9 mph
9 mph
0600
37°F
NE
9 mph
9 mph
0900
37°F
NE
11 mph
11 mph
