Charleston is warmest from May to September with the mean maximum temperature ranging from 28-37°C (83-98 °F). In Charleston, waters are most inviting from June to October, with monthly maximum averages ranging from 28-30 °C (82-86 °F).
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Click for info. Myrtle Beach, located in Horry County, is a part of South Carolina's Grand Strand. From June through early October water temperatures are practically tropical making this area perfect for swimming and beach activities.
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.
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.
A little cooler than your body temperature (98.6° Fahrenheit) should not be too cold so that you don't get chilled. 70° to 78° Fahrenheit is the range where most folks feel comfortable swimming.
Isle of Palms (IOP)Separated from Mount Pleasant by the Intracoastal Waterway, Isle of Palms is as famous among visitors as it is a favorite for locals. Charlestonians, especially those to the north of the downtown Charleston peninsula, love to visit Isle of Palms beaches for the family friendly amenities.
Folly BeachThe Edge of AmericaHome to the East Coast's second-largest fishing pier, the best waves on the South Carolina Coast and colorful local establishments, Folly Beach has won the hearts of both locals and visitors alike.