What is the current water temperature in Sullivans Island?

Q: What is the current water temperature in Sullivans Island?

As of now, in Sullivans Island, the water temperature is 13.2°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.

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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.

55.8

°F

January 8, 18:33

Trend:

decreasing

Yesterday:

56.0°F

Tomorrow:

55.5°F

Sunrise:

07:23

Sunset:

17:30

Day Length:

10 h. 7 min.

Sullivans Island in January

Minimum:

50.1°F

Average:

56.7°F

Maximum:

67.7°F

Sea water temperature in Sullivans Island today

As of now, in Sullivans Island, the water temperature is 55.8°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 0.2°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 fall a bit.

Recent sea temperature and forecast

Today's reading indicates a minor change compared to the average water temperature of the last two weeks, but the overall trend remains steady. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 63.2°F on 2016, while the historical minimum was 47.0°F on 2018.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 55.6°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Sullivans Island

Date	Current Year actual* / forecast**	last year	10 years average
Jan 1	55.4°F	54.2°F	56.7°F
Jan 2	54.5°F	54.8°F	56.9°F
Jan 3	54.7°F	53.5°F	56.7°F
Jan 4	54.8°F	54.9°F	57.1°F
Jan 5	55.5°F	53.6°F	56.6°F
Jan 6	56.3°F	52.3°F	56.3°F
Jan 7	56.0°F	53.3°F	56.2°F
Jan 8	55.8°F	52.8°F	56.0°F
Jan 9	55.5°F	51.9°F	55.7°F
Jan 10	55.8°F	51.2°F	56.0°F
Jan 11	55.6°F	51.4°F	55.8°F
Jan 12	55.7°F	50.0°F	55.9°F
Jan 13	55.6°F	49.0°F	55.8°F
Jan 14	55.9°F	49.8°F	56.0°F
Jan 15	55.1°F	48.2°F	55.3°F
Dec 25	55.1°F	52.2°F	55.5°F
Dec 26	55.4°F	51.7°F	55.0°F
Dec 27	56.1°F	51.4°F	54.7°F
Dec 28	56.7°F	51.0°F	54.8°F
Dec 29	56.3°F	52.4°F	55.1°F
Dec 30	56.8°F	53.3°F	55.5°F
Dec 31	56.2°F	54.1°F	55.3°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 56.2°F in Winter, 67.2°F in Spring, 82.7°F in Summer, and 73.5°F in Autumn.