June in Yamaguchi averages a daily high of 27.8°C. Expect roughly 12.3 wet days totalling 275.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Yamaguchi is April–May.
Based on YAMAGUCHI, JA (2.4km), 1995–2024. 27 years of June data.