August in Charleston averages a daily high of 30.5°C with nights around 25°C. Expect roughly 11.9 wet days totalling 156.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Charleston is March–May.
Based on DOWNTOWN CHARLESTON, SC US (0.8km), 1995–2024. 29 years of August data.