午前は視界良好 午後霧雨と視界悪化

Maebayama summit is mostly clear this morning with a temperature of 14°C. There is a temperature difference of about 7°C compared to the base, making the summit feel cool. Wind speed is low, resulting in a comfortable apparent temperature of around 14°C. Although the daytime high will reach the upper 17°C range, humidity is expected to remain high.

The ground is currently dry, but the chance of precipitation increases from noon, with light rain expected by 3 PM. The wooden boardwalks across the wet marsh will become slippery, and areas off the boardwalk will be muddy, so strictly avoid stepping off the designated path. The afternoon drizzle could lead to poor visibility, increasing the risk of getting lost in the vast Maebayama summit plateau due to dense fog. Carrying a map, compass, and GPS for navigation is essential.

Layering should include a quick-drying base layer, a thin fleece or insulating shirt, and a waterproof-breathable shell. Full rain gear, both jacket and pants, is mandatory for the afternoon drizzle. While winds are forecast to be light, strong gusts of up to 6.5 m/s are possible, and wet conditions combined with wind can lower the apparent temperature. The risk of hypothermia is low with proper gear, but staying dry and starting your descent early are crucial. Although no thunderstorms are specifically forecast, summer mountain weather can change rapidly, so plan to complete your descent by 3 PM.