富士山頂は薄曇り氷点下。万全の防寒を

Mount Fuji summit is partly cloudy with a temperature of -0.9℃, feeling like -4℃. Temperatures will hover around 0℃ throughout the day, dropping below -1℃ in the evening. There is no precipitation or snowfall, and the ground is exposed volcanic gravel. However, shaded areas and wind-exposed spots may have frost or ice.

For active layering, wear a quick-drying base layer, a thick fleece for a mid-layer, and a waterproof-breathable shell jacket as an outer layer. A down jacket or similar insulating layer is essential during breaks. Do not forget gloves, a knit hat, and a neck warmer. On Mount Fuji's characteristic exposed slopes above the tree line, you are susceptible to wind, which can significantly lower the perceived temperature. Ensure thorough wind protection.

While the risk of lightning is low, severe caution is advised for hypothermia due to the sub-zero temperatures. Especially on the steep volcanic gravel ascents starting from the 5th station on routes like Yoshida-guchi, proceed cautiously, mindful of potential icy patches and falling rocks. Temperatures are forecast to drop further to around -2℃ from afternoon into night. If planning night activities, even more comprehensive cold weather gear is required.