富士山 霧雨と低温続く 視界不良に注意

Fuji summit currently experiences cloudy conditions with visibility below 1 kilometer. The temperature is 3 degrees Celsius, feeling like 0.7 degrees Celsius. While the base is relatively warm at 17.6 degrees Celsius, the summit is significantly colder, with a 14.6-degree difference. Light drizzle is expected to continue throughout the day, with temperatures hovering around 3 degrees Celsius. The wind chill will keep the effective temperature around 0 degrees Celsius, necessitating strict precautions against hypothermia.

Ground conditions are wet to muddy due to the drizzle and high humidity. The steep volcanic scree slopes, especially those starting from the 5th station, will be slippery, increasing the risk of falls and dislodging rocks. When undertaking the O-hachi Meguri (crater rim walk), poor visibility and slippery volcanic scree demand extra caution. As Japan's highest peak, the risk of altitude sickness is always present. Exertion in cold conditions can deplete energy quickly, potentially worsening symptoms.

Essential layering for cold weather is crucial. Wear a quick-drying base layer, a fleece mid-layer, and waterproof-breathable rain gear for both top and bottom. Gloves and a hat are also mandatory. Crampons or chain spikes are not required, but full rain gear is essential. While wind speeds are generally mild, gusts could reach 9.4 meters per second, so be mindful of sudden strong winds characteristic of an isolated peak. The risk of lightning is low. While trekking is possible with adequate preparation for low visibility and cold, descend promptly if you experience any health issues. Precipitation probability decreases from evening to night, but temperatures will drop further to 1-2 degrees Celsius, requiring even more stringent cold weather protection for night activities.