Koyasan Weather in December

December in Koyasan brings low temperatures around 11°C (52°F) during the day, dropping to 2°C (36°F) at night, with the driest conditions of the year.

Rainfall in Koyasan in December

This month sees the least rain of the year, making it well suited for outdoor adventures, even if you'll need a jacket. You can typically expect 14 days of rain this month, averaging around 91 mm (3.6 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.

Temperature in Koyasan in December

If you're visiting Koyasan in December, expect highs of 11°C (52°F) and overnight lows around 2°C (36°F). The winter season takes place during December. It stays cool throughout the day, so warm layers are a good idea from morning to evening. Nights drop to 2°C (36°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in Koyasan in December

The month brings about 134 hours of sunlight, offering a comfortable mix of sun and overcast.

If you prefer dry days with pleasant temperatures, May typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.