Weather
Charleston's climate, like the rest of coastal South Carolina, is mild and humid up until the beginning of summer, when the heat index jumps. January temperatures are moderate, but most range 37-59 F/3-14 C. Expect temperatures to run 53-76 F/11-24 C along the coast in April, 61-83 F/16-27 C in May. Severe thunderstorms can occur in spring.
Visitors expecting to enjoy the beaches will find pleasant conditions through the summer, though July and August are hot (high 80s F/30 C to above 90 F/32 C) and humid. Humidity at 60%-80% in high heat can take a lot out of you, so pace your sightseeing. Drink plenty of water and dress lightly. Be aware that the season for hurricanes and tropical storms is June-November.
The fall sees less humidity, and temperatures range 55-84 F/12-28 C. Indian summer lasts through November, with dry days and temperatures from the low 40s F/5 C to the upper 60s F/18 C.