Charleston — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Charleston (South Carolina, United States). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Charleston help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Charleston in the Atlantic Ocean today is 30°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Water temperature in Charleston has risen over the last week and month. Currently, the sea water at this location is slightly warmer than average for this day in previous years.
According to our forecast, Water temperature in Charleston will be 28.4°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 27 | 28.4°C | 25.0°C | |
| JUN 28 | 28.8°C | 24.8°C | |
| JUN 29 | 28.7°C | 25.3°C | |
| JUN 30 | 29.0°C | 27.8°C | |
| JUL 1 | 29.4°C | 27.8°C | |
| JUL 2 | 29.5°C | 27.5°C | |
| JUL 3 | 29.4°C | 28.3°C | |
| JUL 4 | 29.4°C | 28.3°C | |
| JUL 5 | 29.7°C | 28.3°C | 29.7°C |
| JUL 6 | 28.3°C | 29.5°C | |
| JUL 7 | 28.3°C | 29.3°C | |
| JUL 8 | 28.0°C | 29.1°C | |
| JUL 9 | 28.5°C | 28.9°C | |
| JUL 10 | 27.5°C | 28.8°C | |
| JUL 11 | 27.8°C | 28.6°C | |
| JUL 12 | 28.0°C | 28.4°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Charleston, South Carolina sits on the Atlantic coast and experiences a subtropical maritime influence that keeps sea temperatures milder than inland air temperatures. Seasonal sea-surface temperatures typically range from about 10–15 °C in winter (December–February), climbing through spring to roughly 15–22 °C (March–May). Summer months (June–August) bring the warmest water, commonly around 24–29 °C, while autumn (September–November) sees a gradual cooling with waters generally between 18–25 °C. Tidal marshes and inlets around the harbor can be slightly cooler or warmer than open ocean conditions depending on currents and recent weather, and short-term variations occur with cold fronts and tropical influences.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 12°C | 15°C | 20°C |
| February | 11°C | 15°C | 19°C |
| March | 13°C | 17°C | 21°C |
| April | 15°C | 20°C | 23°C |
| May | 19°C | 23°C | 26°C |
| June | 21°C | 26°C | 29°C |
| July | 26°C | 28°C | 31°C |
| August | 26°C | 29°C | 31°C |
| September | 24°C | 28°C | 30°C |
| October | 20°C | 25°C | 28°C |
| November | 14°C | 20°C | 26°C |
| December | 10°C | 16°C | 23°C |
* Click on a month to view detailed water temperature data.
Charleston: Weather Forecast
July 6
July 7
July 8
Location, Beaches & Local Information
Nearby Beaches & Facilities
Old Bridge Landing
Sullivan's Island Nature Trails
Station 21
Sullivan's Island Beach
Station 18 Beach
Station 22
Station 23
Station 24
Swimming Conditions
Swimming around Charleston is centered on its nearby barrier islands, where beaches such as Folly Beach, Isle of Palms and Sullivan’s Island provide public access, lifeguarded areas in peak season, and amenities suited to a beach holiday. Summer sea temperatures are comfortable for long swims, paddleboarding and casual snorkeling, while spring and autumn offer pleasant but sometimes brisk conditions that some visitors find best suited to shorter swims or wetsuits. Winter swimming is uncommon for most visitors due to cooler waters. Beach safety is important year-round: lifeguards, rip currents, and occasional marine stingers affect where and when people swim. For a relaxed seaside vacation, the area combines sandy shores, local services and a range of water-sport rental options, making it an accessible destination for beachgoers seeking temperate Atlantic water.