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

50.6

°F

February 20, 01:30

Trend:

decreasing

Yesterday:

50.8°F

Tomorrow:

50.6°F

Sunrise:

06:58

Sunset:

18:09

Day Length:

11 h. 11 min.

Sullivans Island in February

Minimum:

51.0°F

Average:

56.9°F

Maximum:

67.6°F

Sea water temperature in Sullivans Island today

As of now, in Sullivans Island, the water temperature is 50.6°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 5.4°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 60.7°F on 2016, while the historical minimum was 49.8°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 suggests a gradual increase. The average temperature is expected to rise up to 51.4°F, with minimum temperature starting at 50.6°F, while the maximum might reach 52.4°F.

Daily water temperature in Sullivans Island

Date Current Year

actual* / forecast**

last year 10 years average
Feb 6 46.0°F 52.3°F 54.0°F
Feb 7 46.1°F 54.2°F 54.2°F
Feb 8 46.9°F 54.8°F 54.6°F
Feb 9 45.8°F 56.8°F 54.5°F
Feb 10 45.8°F 56.4°F 54.2°F
Feb 11 45.3°F 56.8°F 54.6°F
Feb 12 47.6°F 56.8°F 55.1°F
Feb 13 49.2°F 56.4°F 55.8°F
Feb 14 49.1°F 55.7°F 55.2°F
Feb 15 48.7°F 56.0°F 55.0°F
Feb 16 48.5°F 54.2°F 55.1°F
Feb 17 50.6°F 54.3°F 55.6°F
Feb 18 50.0°F 54.9°F 55.4°F
Feb 19 50.8°F 55.2°F 56.2°F
Feb 20 50.6°F 55.5°F 56.0°F
Feb 21 50.6°F 52.4°F 56.0°F
Feb 22 50.7°F 50.9°F 56.1°F
Feb 23 50.9°F 51.3°F 56.3°F
Feb 24 51.4°F 50.1°F 56.8°F
Feb 25 51.9°F 51.4°F 57.3°F
Feb 26 51.9°F 51.7°F 57.3°F
Feb 27 52.4°F 52.0°F 57.8°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 157 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 56.0°F in Winter, 67.2°F in Spring, 82.7°F in Summer, and 73.5°F in Autumn.