Spring (March–May): Average 53–66°F, mild but rainy, especially in April. Common activities: Hiking (be aware of weather changes), onsen experience. Recommended clothing: Light jacket, long-sleeved shirt, rain gear.
Summer (June–August): Average 73–82°F, hot and humid, frequent rainfall from June to August, pay attention to sun protection and rain. Common activities: Onsen, enjoying volcanic views. Recommended clothing: Light and breathable clothing, rain gear, hat.
Autumn (September–November): Average 66–78°F, comfortable climate, rainfall gradually decreases. Common activities: Hiking, viewing autumn leaves (in some areas). Recommended clothing: Comfortable long-sleeved clothing, light jacket.