All data are in degrees Fahrenheit

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Water temperature in Charleston

Detailed information about the current water temperature in Charleston. 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 Charleston now

74.8

°F

October 13, 08:02

Trend:

decreasing

Yesterday:

76.5°F

Tomorrow:

74.6°F

Sunrise:

07:22

Sunset:

18:49

Day Length:

11 h. 27 min.

Charleston in October

Minimum:

49.5°F

Average:

55.9°F

Maximum:

63.1°F

Sea water temperature in Charleston today

As of now, in Charleston, the water temperature is 74.8°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is about the same as 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 water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. 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 80.5°F on 2018, while the historical minimum was 70.8°F on 2022.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 73.4°F, the minimum temperature may reach 72.1°F, and the maximum might stay at 74.6°F.

Daily water temperature in Charleston

Date Current Year

actual* / forecast**

last year 10 years average
Sep 29 76.1°F 80.3°F 79.0°F
Sep 30 76.7°F 80.1°F 79.1°F
Oct 1 77.5°F 79.4°F 78.9°F
Oct 2 78.1°F 78.6°F 78.5°F
Oct 3 78.5°F 76.6°F 78.0°F
Oct 4 78.6°F 76.5°F 77.7°F
Oct 5 78.6°F 76.0°F 77.4°F
Oct 6 78.6°F 74.7°F 77.0°F
Oct 7 77.9°F 75.6°F 76.7°F
Oct 8 77.6°F 75.6°F 76.5°F
Oct 9 77.7°F 75.5°F 76.4°F
Oct 10 77.2°F 75.3°F 76.0°F
Oct 11 77.9°F 75.1°F 75.9°F
Oct 12 76.5°F 74.7°F 75.3°F
Oct 13 74.8°F 74.2°F 74.9°F
Oct 14 74.6°F 73.5°F 74.7°F
Oct 15 73.9°F 70.4°F 74.1°F
Oct 16 73.6°F 70.3°F 73.7°F
Oct 17 73.5°F 70.2°F 73.7°F
Oct 18 73.3°F 68.6°F 73.5°F
Oct 19 72.6°F 69.2°F 72.8°F
Oct 20 72.1°F 69.9°F 72.3°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 Charleston by month

In Charleston, the months May through October offer comfortable swimming conditions, which amounts to 156 swimming days.
The warmest water in Charleston was recorded on August 3, 2026, reaching a 87.7°F. While the coldest temperature occurred on February 4, 2026, dipping to 44.0°F. The average readings by season are 56.0°F in Winter, 67.2°F in Spring, 82.9°F in Summer, and 73.5°F in Autumn.