視界不良と冷たい霧雨。低体温症に厳重警戒。

Tateyama (Oyama) today is expected to experience drizzle throughout the day, with extremely poor visibility. The summit's felt temperature will hover around 5°C all day. While the base experiences light drizzle at around 10°C, temperatures will drop and visibility will worsen to less than 1km with increasing elevation. Be mindful of these significant weather differences between the base and the summit.

Due to the forecasted precipitation and high humidity, the trails will be generally wet and muddy. The rocky sections, especially from Ichinokoshi to Oyama summit, will be slippery when wet, and avoiding falling rocks will be difficult under poor visibility. Crampons or microspikes are not needed, but waterproof and breathable rainwear (jacket and pants) is essential.

The current felt temperature at the summit is low at 4.8°C, and even with light winds around 1m/s, it will remain around 5°C throughout the day. Continuing activity while wet significantly increases the risk of hypothermia in a 3000m class mountain environment. Wear moisture-wicking base layers, fleece or light down mid-layers, and waterproof breathable outer layers, adjusting frequently to regulate body temperature. Gloves and a warm hat are also essential.

Visibility is poor, less than 1km, making it easy to lose direction, especially on 3000m class ridges. For beginners or those with insufficient gear, in addition to the risk of altitude sickness, climbing in these adverse conditions is extremely dangerous. Avoid overextending yourself and have the courage to wait for better weather or turn back. Temperatures will remain around 5°C after evening, and drizzle is expected to stop by night, but significant visibility improvement is unlikely.