午後から霧雨と体感低下。早い行動開始を

The morning on Mount Ontake is generally clear, but the summit's perceived temperature is 9.4 degrees Celsius. There is a significant 9.5-degree difference from the base, making a mid-layer like a light fleece appropriate. Choose a quick-drying base layer and always carry a waterproof-breathable outer shell.
Light drizzle is expected around noon, intensifying to a strong drizzle by 3 PM. Although the temperature at this time will be around 11.4 degrees Celsius with winds up to 1.08 m/s, the strong drizzle will significantly lower the perceived temperature. The white volcanic scree slopes above the treeline will become very slippery when wet, requiring extra caution, especially during descent.
Considering the afternoon drizzle and potential for reduced visibility, those aiming for the summit of Kengamine should plan to ascend early in the morning and begin their descent by 2 PM at the latest. Wear appropriate rain gear and warm clothing to mitigate the risk of hypothermia when wet. As an active volcano, always carry a helmet on Mount Ontake.
Drizzle will continue intermittently into the night, with temperatures dropping to around 8 degrees Celsius. Avoid any activity after sunset and ensure an early completion of your day's plans.