Sullivan's Island water temp
This data the coastal Sullivan's Island 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 Sullivan's Island
Water temperature in Sullivan's Island today is 77.2°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Sullivan's Island was recorded in 2014 and was 83.3°F, and the coldest was recorded in 2024 at 77.4°F. Sea water temperature in Sullivan's Island is expected to rise to 79.3°F in the next 10 days. September average water temperature in Sullivan's Island is 81°F, the minimum temperature is 74.3°F, and the maximum is 86.4°F.
The swimming season in Sullivan's Island lasts from April to November. During those months, Sullivan's Island water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Sullivan's Island in winter reaches 60.6°F, in spring 66.9°F, in summer the average temperature rises to 82°F, and in autumn it is 74.1°F.
Sullivan's Island water temperature now
| September 17, 2025 |
|---|
| today temp |
| 77.2°F |
| September 16, 2025 |
|---|
| yesterday temp |
| 76.8°F |
The ocean salinity in Sullivan's Island is 33.63‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Sullivan's Island 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 Sullivan's Island. 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 Sullivan's Island. Data in table shown for September 17, 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 |
|---|---|---|---|
| 1' 4" | 1' 3" | 1' 3" | 1' 2" |
| 0.41 m | 0.37 m | 0.37 m | 0.35 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 1" | 1' 1" | 1' 5" | 1' 4" |
| 0.34 m | 0.34 m | 0.43 m | 0.41 m |
Surf report in Sullivan's Island
Sullivan's Island weather forecast
Current temperature and weather
Data in a table show Sullivan's Island temperature today (September 17, 2025). For more information and forecast for a few days, go to the weather forecast Sullivan's Island.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | |  |  |
| 77°F | 74.3°F | 71.6°F | 73.2°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | | |
| 83.8°F | 83.3°F | 81.3°F | 78.6°F |
You may also be interested in other sections of our site for Sullivan's Island: Sunrise and Sunset, Tides
Sullivan's Island water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Sullivan's Island. 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 Sullivan's Island 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 Sullivan's Island
