穏やかな山頂。脆い火山礫に足元注意

Mount Rishiri is currently clear with a summit temperature of 10.6°C, feeling like 7.7°C. Winds are calm, and visibility extends beyond 20km. From 9 AM to around 3 PM, cloudy conditions are expected, but temperatures will remain between 12°C and 13°C, with gusts up to 10.7m/s, indicating relatively stable conditions.

The ground is mostly dry due to no precipitation, however, the brittle volcanic scree from the 9th station to the summit remains unstable. Extreme caution is required for falling rocks and slips on steep sections of routes like the Oshidomari course and Kutsuugata course. Crampons or microspikes are not necessary, but sturdy hiking boots are essential to protect your feet.

A sharp temperature drop of 7°C is anticipated during the forecast period. While the base areas will exceed 20°C, summit temperatures will hover around 7°C to 11°C, cooling further in the evening. Wear a base layer, a mid-layer such as fleece, and a wind-resistant outer shell. Carry an extra lightweight down or synthetic insulated jacket for breaks or as temperatures drop later in the day. After 3 PM, winds will diminish, but light drizzle is forecast after midnight, turning to showers by early morning, with temperatures dropping to around 4°C. The risk of hypothermia increases if your activity extends into these colder, wet conditions, so rain gear is mandatory, and an early turnaround decision is advisable. The risk of lightning is low.