Average annual water temperature on the coast in Charleston is 72°F, by the seasons: in winter 62°F, in spring 68°F, in summer 82°F, in autumn 77°F. Minimum water temperature (56°F) in Charleston it happens in January, maximum (86°F) in July.
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In Charleston, waters are most inviting from June to October, with monthly maximum averages ranging from 28-30 °C (82-86 °F).
Sea TemperatureSurface water temperature in December at the beaches near Charleston is around 64-68°F (17-21°C), which most people will find too cold for swimming but is still acceptable for some watersports on warmer days.
Folly Beach County ParkLocated just 15 minutes from downtown Charleston, this beach park is a popular spot for swimming and sunbathing. The park offers a large swimming area with lifeguards on duty during the summer months, making it a great option for families.
Average Ocean Temperatures for North & South CarolinaThe water at beaches in North Carolina and South Carolina stays warm enough from May to mid-October for most people to enjoy swimming. Ocean temperatures normally peak at over 80 °F (high 20s °C) during summer. The farther south you go, the warmer the sea.
The warmest water temperature is in August with an average around 82.8°F / 28.2°C. The coldest month is March with an average water temperature of 57.7°F / 14.3°C.
As was mentioned before, you have plenty of time for swimming in the ocean starting from late April - early May (water temperature varies from 68°F to 71°F) and ending in late September - early October (water temperature varies from 79°F to 73°F). Ocean waters are gentle, have shallow slopes and smooth surfaces.
The Isle of Palms Beach is about 36 minutes from Charleston and sits just north of Sullivan's Beach. Regarded as one of the safest beaches for kids due to its calm waves and family-friendly beach set-up, the Isle of Palms is a great place to live or visit with your family.
The best time to visit Charleston, SC is from mid-March through May and from September through November, when temperatures are moderate. Take advantage of spring and fall's excellent walking weather to stroll the city's parks and the waterfront Battery.
The water along Folly Beach went from brown to a brilliant blue. Some are comparing it to the waters along South Florida and the explanation is actually quite simple. According to a local geology professor, it's thanks in part to the $30-million renourishment project.