Owariasahi's climate is characterized by mild winters, with temperatures occasionally dipping below freezing but often rising above 0°C. Springs are cool at first, warming up rapidly in April and May, with temperatures frequently reaching the mid-20s to low 30s. Summers are hot and humid, with temperatures regularly exceeding 35°C from July to August. Autumn is a gradual cooling, with temperatures dropping back into single digits by November, but still experiencing occasional warm days. Winters are generally mild, with temperatures ranging from just below freezing to the mid-teens.