日中から雨模様 山頂は冬の装い

As of 7 AM, Mount Fuji summit is mostly clear with light winds, but conditions will change significantly through the day. While the base experiences summer temperatures of 21.5℃, the summit is a chilly 6.8℃. This significant temperature difference must be considered for your ascent.

Light rain is expected to begin around noon, intensifying to moderate rain by 3 PM. The current dry volcanic scree will quickly become wet and muddy with the rainfall, increasing the risk of slips, especially on the steep ascents. On exposed routes like the Yoshida Trail or Fujinomiya Trail, which are above the tree line and offer no shelter, prolonged exposure to rain and cold temperatures significantly raises the risk of hypothermia.

The effective temperature will hover around 5℃ during the day, dropping further when wet. Despite being summer, conditions will resemble winter. Essential gear includes a waterproof and breathable outer shell jacket and pants, a mid-layer such as fleece, and a quick-drying base layer. Gloves and a warm hat are also crucial.

Although the rain is forecast to stop by evening, temperatures will continue to drop, reaching as low as 2.7℃ by early morning. Avoid nighttime ascent and ensure adequate cold weather protection even when staying in mountain huts.