December in Nakatsu averages a daily high of 11.8°C. Expect roughly 10.8 wet days totalling 63.9mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Nakatsu is April–May.
Based on HITA, JA (39.2km), 1995–2024. 28 years of December data.