January in Kōka averages a daily high of 8.4°C. Expect roughly 7.3 wet days totalling 45.6mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Kōka is April–June.
Based on UENO, JA (23.7km), 1995–2024. 28 years of January data.