January in Asahi averages a daily high of 10°C with nights around 3°C. Expect roughly 7.8 wet days totalling 91.8mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Asahi is May–October.
Based on CHOSHI, JA (18.1km), 1995–2024. 24 years of January data.