Winters in Isahaya are mild, with temperatures rarely dropping below freezing and averaging around 8-9°C, while springs bring rising temperatures, peaking at averages of 16°C in April. Summers are warm to hot, with July being the hottest month, averaging a high of 28°C, although temperatures can occasionally reach as high as 36°C. Autumn is characterized by decreasing temperatures, returning closer to spring levels by November, which averages around 14°C.