Charlestown Beach water temp
This data the coastal Charlestown Beach ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in Charlestown Beach
Water temperature in Charlestown Beach today is 68°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Charlestown Beach was recorded in 2021 and was 71.6°F, and the coldest was recorded in 2013 at 64.6°F. Sea water temperature in Charlestown Beach is expected to drop to 66°F in the next 10 days. September average water temperature in Charlestown Beach is 67.6°F, the minimum temperature is 63.3°F, and the maximum is 72.7°F.
The swimming season in Charlestown Beach lasts from July to September. During those months, Charlestown Beach water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Charlestown Beach in winter reaches 44.1°F, in spring 45.5°F, in summer the average temperature rises to 66.6°F, and in autumn it is 62.1°F.
Charlestown Beach water temperature now
| September 18, 2025 |
|---|
| today temp |
| 68°F |
| September 17, 2025 |
|---|
| yesterday temp |
| 67.8°F |
Surf Forecast in Charlestown Beach for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Charlestown Beach. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Charlestown Beach. Data in table shown for September 18, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 4' 2" | 3' 10" | 3' 4" | 3' 0" |
| 1.26 m | 1.16 m | 1.02 m | 0.91 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 2' 9" | 2' 6" | 2' 4" | 2' 2" |
| 0.83 m | 0.76 m | 0.71 m | 0.67 m |
Surf report in Charlestown Beach
Charlestown Beach weather forecast
Current temperature and weather
Data in a table show Charlestown Beach temperature today (September 18, 2025). For more information and forecast for a few days, go to the weather forecast Charlestown Beach.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  | |  |
| 66.9°F | 66.9°F | 66.6°F | 66.6°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 |  | |  |
| 67.6°F | 70.3°F | 71.2°F | 69.6°F |
You may also be interested in other sections of our site for Charlestown Beach: Sunrise and Sunset, Tides
Charlestown Beach water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Charlestown Beach. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Charlestown Beach on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
Chart monthly average water temperature in Charlestown Beach
