山頂は氷点下視界不良。火山礫凍結に注意

Current conditions at Mount Fuji summit show thin clouds and visibility under 1km. The temperature is -3.8C, feeling like -7.4C. Sub-zero temperatures are expected throughout the day, with a possibility of light snow around noon. The perceived temperature will remain around -7C.

On the steep volcanic scree slopes above the 5th station, icy patches are highly probable due to the low temperatures and 96% humidity. These areas, particularly in shade or wind-exposed zones, will be slippery. Carry microspikes or light crampons and be prepared to use them. Watch for falling rocks on the climbing routes.

As an isolated peak, Mount Fuji is highly susceptible to wind, and the exposed slopes above the tree line will experience even colder wind chill. There is a significant risk of hypothermia without adequate cold weather gear. Layer with a wicking base, insulating mid-layers, and a waterproof/breathable outer shell, and protect your hands, head, and face with gloves, a warm hat, and a balaclava.

While the forecast indicates clearing skies by evening, temperatures will drop further, reaching around -6C overnight into early morning. Extended exposure in low visibility conditions increases risk. Plan your ascent carefully and be prepared to turn back if symptoms of altitude sickness appear.