午前中は視界不良。午後は雨具必須。

Currently, the summit of Mt. Shirouma is mostly clear, but visibility is less than 1km due to dense fog. The temperature is 11.1°C, with a felt temperature of 10.7°C, which is 9.5°C lower than the 20.6°C at the base. The morning is expected to be partly cloudy, but rain will begin around noon and continue as light rain throughout the afternoon.

Consequently, while some parts of the hiking trails may be relatively dry in the morning, they will become wet and muddy after midday. Specifically, the Daisekkei (Great Snow Valley), one of Japan's three major snow valleys, retains snow even in summer, posing a high risk of slipping. With the added rain, it will become even more treacherous, making light crampons or chain spikes essential. Extreme caution is also required to avoid stepping through soft snow.

Although the temperature is not critically low at around 11°C, getting wet in the rain will rapidly decrease the felt temperature, increasing the risk of hypothermia. Always carry waterproof and breathable shell jacket and pants over a wicking base layer and a thin fleece mid-layer, and be prepared to wear them promptly. Deteriorating visibility is also anticipated, so diligent navigation using a map, compass, and GPS is crucial.

The afternoon rain is expected to last until evening, clearing around 9 PM, but visibility recovery is uncertain. It is advisable to plan for an early start to complete your descent before the rain begins at noon.