春のアンヌプリ 霧雨に濡れる登山道

The summit of Niseko Annupuri is currently cloudy, with a temperature of 10.6℃ and a gentle wind of 1.19m/s, making the perceived temperature 9.9℃. There is no snow cover, and while trails are presently dry, the high humidity of 94% indicates a moist atmosphere.

Light drizzle is forecast to begin around noon, persisting as light drizzle with a 78% chance of precipitation by 3 PM. From 6 PM onwards, a 100% chance of light rain is expected, with summit temperatures dropping to around 8℃ overnight. Consequently, hiking trails will become wet in the afternoon, progressing to muddy conditions by night. Particular caution is advised on the "long, gentle to moderate slopes" (緩中斜面ロングコース) of Annupuri, where slippery sections will increase significantly due to the rain.

For today's activity, waterproof-breathable rain gear (jacket and pants), a quick-drying base layer, and a mid-layer such as fleece or a light softshell are essential. While temperatures are not extremely low, getting wet can rapidly decrease the perceived temperature, elevating the risk of hypothermia. On routes accessing the ridge, diminished visibility is also anticipated with the onset of drizzle. Therefore, prompt use of rain gear and sound judgment are crucial. Although the risk of strong winds or thunderstorms is low, considering the afternoon precipitation, it is strongly recommended to start your activity early and complete your descent to a safe area before 3 PM.