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Koyasan

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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

5/17
Sunday
Sunny
79.2°F/54.3°F
5/18
Monday
Sunny
83.5°F/55.6°F
5/19
Tuesday
Patchy rain nearby
81.5°F/57°F
5/20
Wednesday
Heavy rain
71.6°F/62.1°F
5/21
Thursday
Moderate rain
67.6°F/61°F
5/22
Friday
Patchy rain nearby
59.5°F/53.3°F
5/23
Saturday
Patchy rain nearby
70°F/58°F

Koyasan Frequently Asked Questions and Useful Information for Travel

Is Koyasan worth a day trip?

For a day trip, Koyasan is a must-visit location without a doubt! Here, the mausoleum of Kukai is located in the center of Okunoin Cemetery, and over 200,000 tombstones and memorials line the approach to the mausoleum, which is surrounded by tall cedar trees that give the area a calm and ethereal feel.

What is Koyasan famous for?

Koyasan is a sacred site in Shingon Esoteric Buddhism, founded by the famous monk Kukai (also known by his title, Kobo Daishi) in 816, around 1,200 years ago. This area is home to a number of famous sites registered as World Heritage, and welcomes a constant stream of visitors from Japan and overseas.

How many days do you need in Koyasan?

While walking is a great way to explore, you can also use public transport like the cable car or bus to get around Koyasan easily. If you have time or budget constraints, it is possible to visit Koyasan as a day trip and enjoy it immensely. However, staying for two days and one night is also a wonderful option.

How do I go from Osaka to Koyasan?

Koyasan is most conveniently accessed by Nankai Railway from Osaka's Namba or Shin-Imamiya stations. Take the Nankai Koya Line from either station to the Gokurakubashi terminal station. A few limited express trains operate directly to Gokurakubashi, which takes about 80 minutes and costs around 1720 yen, with services running every 1-3 hours.

What are the main attractions in Koyasan?

The main attractions in Koyasan include the vast and serene Okunoin Cemetery, which is the site of Kukai's mausoleum and lined with ancient cedar trees and over 200,000 tombstones. Other significant sites include Kongobu-ji Temple, the headquarters of Shingon Buddhism, and the Garan temple complex, featuring numerous pagodas and halls.