Our tour guide, Yan Lei, was very helpful to our group, providing water, black bean tea, and snacks. There was plenty of time on the itinerary; after visiting the Danjo Garan and Kongōbu-ji Temple, we could have lunch and continue exploring. To get to Okunoin, we would pass through a large cemetery, so please be prepared.
Anonymous User
Solo traveler
Koyasan Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Koyasan year round climate
Spring (March–May): Average 51–65°F, mild and comfortable climate, but with relatively high rainfall, especially in May. Common activities: Visiting Koyasan temples, hiking (be aware of changing weather conditions). Recommended clothing: Light jacket, long-sleeved shirt, rain gear.
Summer (June–August): Average 72–83°F, hot and humid, with occasional showers. Common activities: Visiting temples, experiencing local culture, escaping the heat in the mountains. Recommended clothing: Breathable and sweat-wicking clothing, sun hat, rain gear.
Autumn (September–November): Average 60–80°F, comfortable and pleasant climate, with reduced rainfall. Common activities: Autumn leaves viewing (in some areas), visiting temples, hiking. Recommended clothing: Light jacket, long-sleeved shirt.
Winter (December–February): Average 44–49°F, cold and dry, with little rain. Common activities: Visiting temples, experiencing onsen (in nearby areas). Recommended clothing: Warm jacket, sweater, scarf, gloves.
Koyasan climatological average
Annual average temperature: approx. 63.7°F / Annual rainfall: approx. 1794 mm / Summer humidity: 70%–80% / Rainiest month: May
Koyasan monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
45°F
63.9
February
45°F
59.2
March
51.1°F
113.6
April
59.7°F
163.5
May
65.5°F
313.2
June
72.7°F
285.1
July
81.3°F
200.3
August
83.7°F
130.6
September
80.6°F
161.5
October
68.9°F
141
November
60.3°F
101.2
December
49.6°F
61.5
Koyasan weather for the next seven days
8/17
Monday
Partly Cloudy
90.3°F/68.2°F
8/18
Tuesday
Sunny
91.6°F/67.1°F
8/19
Wednesday
Sunny
91.2°F/70°F
8/20
Thursday
Sunny
88°F/70.1°F
8/21
Friday
Partly Cloudy
85.5°F/71.1°F
8/22
Saturday
Light rain shower
85.8°F/70°F
8/23
Sunday
Patchy rain nearby
85.4°F/71°F
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