Kawashiri experiences a mild climate, with temperatures gradually warming up throughout the year. Winters are cool but not harsh, with January and February averaging around 6-7°C, while springs bring welcome warmth, with March and April temperatures rising to averages of 11-14°C. Summers are hot and humid, with June to August seeing average highs of 23-27°C, although July can sometimes reach scorching highs above 36°C. Autumn brings a gentle cool-down, with September and October averaging around 24-19°C, while winters return with temperatures fluctuating between 4-18°C from November to December.