雨に濡れた直登ルート 視界不良に注意

Current conditions on Mount Yotei's summit show light rain, a temperature of 10.4°C, and a perceived temperature of 9.4°C. Wind speeds are relatively mild, but gusts have reached 10.9m/s. There is a temperature difference of over 10°C compared to the base, making it feel significantly colder at the summit.

Throughout the day, light drizzle to showers are expected, with perceived summit temperatures ranging from 10°C to 12°C. Given the continuously wet environment, a moisture-wicking base layer, a thin fleece or synthetic insulation for a mid-layer, and waterproof-breathable rain gear (jacket and pants) are essential. Waterproof hiking boots, waterproof gloves, and a knit hat are also mandatory.

All direct ascent routes, including Hirafu, Makkari, Kyogoku, and Kimobetsu, are expected to be wet to muddy due to the rain. The rocky terrain above the tree line will be particularly slippery when wet. Current visibility is 4.4km, but it is highly likely to deteriorate rapidly with ongoing drizzle. Mount Yotei, being an isolated peak, always carries the risk of sudden weather changes. In low visibility, traversing the crater rim (Ohatsu-meguri) should be avoided due to increased fall hazards.

While no significant alerts were detected by the automated risk assessment, the risk of hypothermia is ever-present. Avoid prolonged exposure to wet conditions. Drizzle will continue into the evening and night, with temperatures dropping to around 9°C. Prioritize early starts and be prepared to turn back if conditions worsen.