August in Mizusawa averages a daily high of 27.6°C. Expect roughly 13.2 wet days totalling 178.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Mizusawa is May–June.
Based on OFUNATO, JA (50.9km), 1995–2024. 22 years of August data.