December in Carolina averages a daily high of 29.1°C with nights around 23.1°C. Expect roughly 21 wet days totalling 131.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Carolina is November–April.
Based on SAN JUAN L M MARIN INTERNATIONAL AIRPORT, PR US (8km), 1995–2024. 30 years of December data.