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 20.75°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool.

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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.

69.4

°F

April 19, 10:43

Trend:

stable

Yesterday:

69.6°F

Tomorrow:

69.6°F

Sunrise:

06:45

Sunset:

19:52

Day Length:

13 h. 7 min.

Sullivans Island in April

Minimum:

49.6°F

Average:

57.1°F

Maximum:

66.5°F

Sea water temperature in Sullivans Island today

As of now, in Sullivans Island, the water temperature is 69.4°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 1.7°F higher 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 rise 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 maximum temperature for this date. The maximum temperature recorded for this date was 70.0°F on 2017, while the historical minimum was 63.6°F on 2016.

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. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 70.1°F, with minimum temperature starting at 69.6°F, while the maximum might reach 70.8°F.

Daily water temperature in Sullivans Island

Date	Current Year actual* / forecast**	last year	10 years average
Apr 5	67.7°F	67.9°F	64.5°F
Apr 6	67.8°F	67.7°F	64.9°F
Apr 7	69.1°F	69.0°F	65.3°F
Apr 8	67.4°F	68.8°F	65.8°F
Apr 9	64.3°F	68.6°F	65.3°F
Apr 10	63.6°F	67.8°F	64.9°F
Apr 11	62.9°F	67.0°F	64.9°F
Apr 12	65.1°F	68.4°F	65.3°F
Apr 13	65.3°F	67.4°F	65.6°F
Apr 14	66.2°F	66.8°F	66.4°F
Apr 15	67.6°F	67.6°F	66.8°F
Apr 16	68.6°F	67.0°F	67.2°F
Apr 17	68.8°F	66.7°F	67.2°F
Apr 18	69.6°F	67.3°F	67.2°F
Apr 19	69.4°F	68.7°F	67.7°F
Apr 20	69.6°F	69.1°F	67.9°F
Apr 21	69.9°F	69.8°F	68.2°F
Apr 22	70.1°F	71.0°F	68.4°F
Apr 23	69.9°F	70.4°F	68.2°F
Apr 24	70.2°F	71.5°F	68.6°F
Apr 25	70.6°F	71.5°F	68.9°F
Apr 26	70.8°F	71.4°F	69.1°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 55.9°F in Winter, 67.2°F in Spring, 82.7°F in Summer, and 73.5°F in Autumn.