January in Charleston averages a daily high of 14.8°C with nights around 6.6°C. Expect roughly 8.2 wet days totalling 56.2mm. 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. 30 years of January data.