December in Portmore averages a daily high of 31.7°C with nights around 23°C. Expect roughly 5.1 wet days totalling 28.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Portmore is December–April.
Based on NORMAN MANLEY INTERNATIONAL, JM (11.2km), 1995–2024. 19 years of December data.