山頂は高湿度。岩場は濡れて滑りやすい

Mount Chokai summit is partly cloudy with visibility around 2.7 kilometers. High humidity at 97% indicates influence from moist air off the Sea of Japan. The felt temperature will range from 3 to 7 degrees Celsius during the morning, but gusts exceeding 10 meters per second will lower the effective temperature. This contrasts sharply with the nearly clear skies at the base, highlighting significant weather differences with elevation.

Ground conditions are expected to be wet and slippery, particularly in the rocky areas around Shinsan, despite no precipitation, due to high humidity and low temperatures. Muddy sections may also be present. While major snowfields have largely melted, localized snow patches in gullies might still exist, requiring caution against post-holing.

Trekking is feasible, but gear and actions must account for the risk of hypothermia from wetness and the potential for slipping. Wear a quick-drying base layer, a fleece mid-layer, and a windproof, waterproof shell as an outer layer. An additional insulated jacket is recommended for breaks or exposed ridges. Gloves and a hat are also essential. Crampons or microspikes are not needed.

Temperatures will drop to around 5 degrees Celsius in the evening, with gusts potentially exceeding 15 meters per second. This increases the risk of heat loss from wind exposure, especially on long ridge routes like Hokotate or Yunodai courses. Avoid activity at night when felt temperatures could approach 0 degrees Celsius.