August in Yonezawa averages a daily high of 30.8°C. Expect roughly 11.5 wet days totalling 142.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Yonezawa is May–June.
Based on YAMAGATA, JA (43km), 1995–2024. 24 years of August data.