霧雨で濡れる山肌。独立峰の低温に厳重警戒

Rishiri-zan will experience continuous drizzle to rain throughout the day. The current summit temperature is 2.6°C, with a felt temperature of -0.4°C, indicating significantly colder conditions at higher elevations compared to the base. Although temperatures may rise slightly to 5.2°C around noon, the 98% humidity means getting wet will drastically lower the perceived temperature.

Trail conditions are wet and muddy due to the persistent drizzle. The fragile volcanic scree from the 9th station to the summit is particularly slick when wet, increasing the risk of slips. Visibility is also poor at 1.7km, requiring careful attention to foot placement. Exercise extreme caution on the upper sections of the Oshidomari and Kutsuugata courses.

With felt temperatures below freezing, the risk of hypothermia is high. Essential layering includes a moisture-wicking base layer, an insulating mid-layer such as fleece, and a waterproof-breathable shell as an outer layer. Gloves, a warm hat, and spare dry clothing are crucial. Ensure you have full rain gear and waterproof hiking boots.

Rainfall is expected to increase from evening into night, with temperatures dropping close to 0°C. Nighttime activity carries a significantly elevated risk of hypothermia, therefore, a timely descent during daylight hours is strongly advised.