December in Miyakojima averages a daily high of 22.1°C. Expect roughly 13.9 wet days totalling 144.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Miyakojima is October–May.
Based on MIYAKO, JA (1.8km), 1995–2024. 18 years of December data.