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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 10.6–18.6°C, 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 22.6–28.7°C, 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 15.7–27.0°C, 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 7.2–9.8°C, 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. 17.6°C / Annual rainfall: approx. 1794 mm / Summer humidity: 70%–80% / Rainiest month: May

Koyasan monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
7.2°C
63.9
February
7.2°C
59.2
March
10.6°C
113.6
April
15.4°C
163.5
May
18.6°C
313.2
June
22.6°C
285.1
July
27.4°C
200.3
August
28.7°C
130.6
September
27°C
161.5
October
20.5°C
141
November
15.7°C
101.2
December
9.8°C
61.5

Koyasan weather for the next seven days

8/17
Monday
Partly Cloudy
32.4°C/20.1°C
8/18
Tuesday
Sunny
33.1°C/19.5°C
8/19
Wednesday
Sunny
32.9°C/21.1°C
8/20
Thursday
Sunny
31.1°C/21.1°C
8/21
Friday
Partly Cloudy
29.7°C/21.7°C
8/22
Saturday
Light rain shower
29.9°C/21.1°C
8/23
Sunday
Patchy rain nearby
29.7°C/21.7°C

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.