残雪と泥濘の姿見平 夕方以降は急激な冷え込みに警戒

Mount Asahidake (1595m) at 7:30 AM reports cloudy skies with a temperature of 9°C, feeling like 6.1°C. The base (1107m) is 14°C, indicating a 5°C difference. Daytime summit temperatures are expected to reach around 10°C, but a significant temperature drop will begin in the afternoon, with a rapid cool-down in the evening.

Current snow depth is 41cm. With positive daytime temperatures, the remaining snow will soften, leading to wet and muddy conditions in snowy sections. On the route from Asahidake Ropeway Sugatami Station to the summit, particularly around the Fumarole Group (Jigokudani), melting snow will expose muddy paths and wet rock ridges. Caution is advised for post-holing in remaining snow.

The feels-like temperature starts around 6°C in the morning and will drop further in the afternoon. A quick-drying base layer, fleece mid-layer, and waterproof breathable shell are essential. While active, body heat increases, but during breaks or in windy conditions, it can get cold. Therefore, always carry an additional insulation layer, such as a thin down or synthetic jacket. Waterproof hiking boots and gaiters are mandatory, but crampons or microspikes are not required.

As indicated by the automated risk assessment, a sharp temperature drop of 12°C is expected over the forecast period. Temperatures will fall below freezing near the summit overnight, with feels-like temperatures plummeting to around -10°C by early morning. Prolonged activity increases the risk of hypothermia, so evening excursions should be avoided. Winds will remain mild during the day, but gusts exceeding 10m/s are expected overnight into early morning. The risk of lightning is low. Daytime hiking and trekking are possible, but do not underestimate Asahidake's unique risk of low temperatures even in summer. Ensure thorough cold weather preparation and make early decisions to turn back.