December in Uwajima averages a daily high of 13.7°C. Expect roughly 10.8 wet days totalling 77.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Uwajima is April–May.
Based on UWAJIMA, JA (1.4km), 1995–2024. 28 years of December data.