South Carolina has a humid, sub-tropical climate, with long, hot summers and short, mild winters. Spring and autumn are the most pleasant seasons. In winter, temperatures generally average 5 to 7°C (40 to 45°F) in inland areas, and 12 to 15ºC (55 to 60°F) by the shore. Summer temperatures, modified by mountains in some areas and by sea breezes in others, range from 24 to 29ºC (75 to 85°F), and can reach as high as 32ºC (90°F) and above.

Lightweights are advised throughout the year, with warmer clothes for winter. Beachwear is popular, and protection from the midday sun, such as sunglasses and sun hats, is advisable.