All data are in degrees Fahrenheit

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Water temperature in Sullivans Island

Detailed information about the current water temperature in Sullivans Island. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Sullivans Island now

61.1

°F

November 17, 12:13

Trend:

stable

Yesterday:

60.5°F

Tomorrow:

60.7°F

Sunrise:

06:51

Sunset:

17:17

Day Length:

10 h. 26 min.

Sullivans Island in November

Minimum:

50.5°F

Average:

56.5°F

Maximum:

63.5°F

Sea water temperature in Sullivans Island today

As of now, in Sullivans Island, the water temperature is 61.1°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 4.6°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 71.2°F on 2020, while the historical minimum was 60.8°F on 2021.

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 59.3°F, the minimum temperature may reach 57.2°F, and the maximum might stay at 60.7°F.

Daily water temperature in Sullivans Island

Date Current Year

actual* / forecast**

last year 10 years average
Nov 3 63.1°F 71.0°F 69.4°F
Nov 4 64.6°F 71.0°F 68.8°F
Nov 5 62.9°F 70.4°F 68.6°F
Nov 6 62.9°F 71.5°F 68.6°F
Nov 7 63.9°F 71.3°F 68.6°F
Nov 8 63.8°F 71.9°F 68.6°F
Nov 9 65.5°F 71.3°F 68.0°F
Nov 10 66.3°F 70.8°F 67.6°F
Nov 11 64.5°F 70.3°F 67.0°F
Nov 12 63.7°F 70.1°F 66.8°F
Nov 13 60.6°F 69.7°F 66.4°F
Nov 14 59.3°F 69.1°F 65.9°F
Nov 15 60.0°F 69.7°F 65.8°F
Nov 16 60.5°F 67.8°F 65.5°F
Nov 17 61.1°F 66.6°F 65.7°F
Nov 18 60.7°F 65.7°F 65.3°F
Nov 19 60.3°F 66.7°F 64.9°F
Nov 20 60.0°F 67.8°F 64.6°F
Nov 21 59.5°F 68.1°F 64.1°F
Nov 22 59.0°F 67.7°F 63.6°F
Nov 23 58.1°F 65.5°F 62.7°F
Nov 24 57.2°F 63.0°F 61.8°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Sullivans Island by month

In Sullivans Island, the months May through October offer comfortable swimming conditions, which amounts to 156 swimming days.
The warmest water in Sullivans Island was recorded on August 1, 2025, reaching a 86.8°F. While the coldest temperature occurred on January 26, 2025, dipping to 44.1°F. The average readings by season are 56.9°F in Winter, 67.1°F in Spring, 82.7°F in Summer, and 73.6°F in Autumn.