Charlestown (RI) water temp

This data the coastal Charlestown 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

Water temperature in Charlestown today is 68.7°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Charlestown was recorded in 2018 and was 72°F, and the coldest was recorded in 2017 at 66.4°F. Sea water temperature in Charlestown is expected to drop to 68°F in the next 10 days. September average water temperature in Charlestown is 67.6°F, the minimum temperature is 63.3°F, and the maximum is 72.7°F.

The swimming season in Charlestown lasts from July to September. During those months, Charlestown water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Charlestown 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 water temperature now

The ocean salinity in Charlestown is 29.11‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Charlestown 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. 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. Data in table shown for September 5, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Charlestown

Charlestown weather forecast

Current temperature and weather

Data in a table show Charlestown temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Charlestown.

0-3 h	3-6 h	6-9 h	9-12 h
67.6°F	67.8°F	68.5°F	68.7°F

12-15 h	15-18 h	18-21 h	21-24 h
69.3°F	70.3°F	69.4°F	69.3°F

Charlestown water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Charlestown. 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 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

The nearest beaches and cities from Charlestown with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Charlestown Beach	68.7°F	69.8°F		3' 3"
Quonochontaug	68.7°F	69.8°F		3' 2"
East Beach	68.7°F	69.8°F		3' 2"
Green Hill	68.5°F	69.8°F		3' 3"
Weekapaug	68.7°F	69.8°F		3' 2"
South Kingstown	68.4°F	69.8°F		3' 3"
Fenway Beach	68.7°F	69.8°F		3' 2"
Matunuck	68.5°F	71.6°F		3' 3"
Jerusalem	68.5°F	71.6°F		3' 3"
Misquamicut	68.7°F	73.4°F		3' 0"

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Charlestown Beach, Charlestown Breachway

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Our report for Charlestown is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.