December in Higashi-Matsuyama averages a daily high of 12.3°C. Expect roughly 4.3 wet days totalling 40mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Higashi-Matsuyama is April–May.
Based on KUMAGAYA, JA (13.3km), 1995–2024. 25 years of December data.