December in Ōtawara averages a daily high of 7.7°C. Expect roughly 7.3 wet days totalling 52.6mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Ōtawara is May–June.
Based on SHIRAKAWA, JA (33.8km), 1995–2024. 29 years of December data.