Ichihara experiences a temperate climate with distinct seasonal changes. Winters are chilly, with temperatures rarely rising above 18°C in January and February, while occasional cold snaps bring temperatures as low as -7°C. As spring arrives in March, temperatures gradually warm up, reaching averages of 12°C, with occasional highs of 24°C by April. Summer is hot and humid, with July and August seeing average highs of 25°C and 27°C respectively, but temperatures can soar above 36°C. Autumn brings a gradual cooling, with temperatures dropping to around 5°C in October before warming up again in November.