日中霧雨で視界不良。噴気孔周辺は特に注意

Mount Asahidake begins the day with cool temperatures, 14.9°C at the base and 12.1°C at the summit. From 9:00 AM onwards, the summit area is expected to shift from light cloud to intermittent light showers. Moderate showers are forecast from noon to 3:00 PM, likely reducing visibility significantly from the current 2km, potentially nearing whiteout conditions.

Under these low visibility circumstances, extreme caution is advised, especially around the volcanic vents of Jigokudani. Given the hazards of volcanic gas and hot springs, it is crucial to stay strictly on designated trails. If visibility deteriorates further, consider postponing or turning back from your ascent. The ground will be generally wet due to the rain, with muddy sections possible in some areas. Waterproof trekking shoes are essential.

The effective temperature during activity will hover around 12°C. However, high humidity combined with light rain can rapidly draw heat from the body, increasing the risk of hypothermia. Essential layering includes a wicking base layer, a mid-layer such as fleece, and a waterproof-breathable rain gear set (jacket and pants). Carry an extra insulating layer for breaks and consider changing out of wet clothing if necessary. While risks of strong winds or lightning are low, Mount Asahidake is known for its cool summer temperatures, making hypothermia a serious concern. Light rain and cool temperatures will persist into the evening, so plan to complete your activities early.