立山午前好天午後霧雨。早めの下山を

Tateyama Mt. Oyama offers a calm morning for climbing. The summit currently reports 6.7°C with a gentle breeze of 0.76m/s, making the felt temperature around 5°C. With sunlight, conditions will feel comfortable. However, strong drizzle is forecasted to begin by noon at 12:00, transitioning to light rain by 15:00. Temperatures will hover around 7°C, and the felt temperature will drop further as the body gets wet from the drizzle. This is approximately 4°C lower than the Murodo base area.

For layering, wear a moisture-wicking base layer, a thin fleece or wool mid-layer, and carry a windproof and waterproof rain jacket and pants as an outer layer. The risk of hypothermia is elevated in the 3000m class Mt. Oyama, especially when exposed to wet conditions. The exposed rocky route from Murodo to Ichinokoshi and up to Mt. Oyama summit will become slippery with the afternoon drizzle, requiring careful foot placement. The rain may also loosen rocks, increasing the risk of rockfall from Ichinokoshi.

There is no snow, so crampons or microspikes are not necessary. However, full rain gear (jacket and pants) is essential. Visibility may also deteriorate in the afternoon. It is advisable to make the most of the morning's good weather to complete your ascent and descent early. While the evening is expected to clear, temperatures will drop to around 3°C, so ensure adequate cold weather protection for hut or tent stays.