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

48.1

°F

February 13, 01:57

Trend:

stable

Yesterday:

47.6°F

Tomorrow:

47.6°F

Sunrise:

07:05

Sunset:

18:03

Day Length:

10 h. 58 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 48.1°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 8.3°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 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 60.8°F on 2020, while the historical minimum was 51.6°F on 2022.

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 47.6°F, the minimum temperature may reach 47.3°F, and the maximum might stay at 47.9°F.

Daily water temperature in Sullivans Island

Date Current Year

actual* / forecast**

last year 10 years average
Jan 30 48.7°F 46.9°F 53.4°F
Jan 31 47.7°F 47.9°F 53.2°F
Feb 1 47.8°F 47.7°F 53.1°F
Feb 2 46.1°F 48.6°F 53.2°F
Feb 3 45.5°F 49.2°F 53.1°F
Feb 4 44.9°F 51.0°F 53.3°F
Feb 5 45.7°F 52.6°F 53.7°F
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 55.9°F
Feb 13 48.1°F 56.4°F 56.4°F
Feb 14 47.6°F 55.7°F 55.9°F
Feb 15 47.3°F 56.0°F 55.6°F
Feb 16 47.5°F 54.2°F 55.8°F
Feb 17 47.8°F 54.3°F 56.1°F
Feb 18 47.6°F 54.9°F 55.9°F
Feb 19 47.9°F 55.2°F 56.2°F
Feb 20 47.8°F 55.5°F 56.0°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.