霧雨と低温が続く。早めの引き返しを

Mount Rishiri summit area is currently cloudy with a temperature of 6℃, feeling like 2.7℃. Weak drizzle is expected throughout the day, with perceived temperatures ranging from 1℃ to 3℃. There is a significant temperature difference of 9.5℃ between the summit and the base, highlighting the mountain's isolated nature and 1500m elevation gain. The fragile volcanic scree from the 9th station to the summit will be slippery due to the drizzle, demanding careful footing. Visibility is also likely to deteriorate, requiring extreme caution.

As indicated by the automated risk assessment for "Rapid Temperature Drop," an 8℃ decrease in temperature is forecast during the period. Prepare for sudden changes by carrying an extra layer of insulation from the outset. Waterproof and breathable rain gear, waterproof gloves, and a hat are essential. The ground will be generally wet with many muddy sections due to the drizzle. There is no snow cover, and rocky ridges are exposed.

While the risk of lightning is low, gusts of up to 11.7m/s are expected during the day, further lowering the perceived temperature. Under these cold, wet, and windy conditions, the risk of hypothermia is extremely high. Considering the physical exertion involved in a long approach, making an early decision to turn back is crucial for safety. Temperatures will drop further from evening to night, reaching below freezing overnight, making a descent before sunset strongly advisable.