午前は穏やか。午後は雨と急な冷え込みに注意

Zao Renpo starts this morning with mostly clear skies, a summit temperature of 8.8°C, and a feels-like temperature of 5.9°C. The temperature difference from the base is 7°C. Visibility is excellent at over 20km, making for pleasant hiking along the ridgeline from Kattadake to Kumanodake. There is no snow cover, and the ground remains primarily dry. For layering, a moisture-wicking base layer and a light fleece mid-layer are recommended, with a waterproof/breathable outer shell carried.

However, conditions will change rapidly this afternoon. Light rain is expected to begin around 15:00, turning the ground wet and potentially muddy. Concurrently, temperatures will drop sharply from 11.4°C at 12:00 to 8.4°C at 15:00, and further to 4.4°C by 18:00. The automated risk assessment indicates a rapid temperature drop of 11°C during the forecast period. Therefore, it is crucial to wear warmer mid-layers such as a medium-weight fleece or a light down jacket, and a waterproof/breathable outer shell as conditions change.

Conditions deteriorate further into the evening. By 21:00, the temperature will be 1.8°C with gusts up to 20.7m/s, dropping below freezing in the early hours of the next day with gusts reaching 27.4m/s. This combination of strong winds and plummeting temperatures will significantly lower the feels-like temperature, posing a high risk of hypothermia. Even tourists using the ropeway and sky cable must be vigilant about the rapidly changing weather near the summit. Strictly observe the crater entry regulations around Okama. While lightning risk is low, the severe wind chill demands extreme caution. Nighttime travel on the ridgeline is highly dangerous. It is advisable to begin your descent by 14:00 at the latest to reach safety.