Koyasan Climate by Month
The climate in Koyasan is marked by big temperature swings throughout the year.
Temperatures range from very warm during the warmest months
to cold in the cooler months.
It also has a relatively rain/snowy climate with high levels of precipitation.
Let’s explore the climate details in depth to provide you with a complete overview.
Average day and night temperature
In Koyasan, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a very warm 32°C in August to a chilly 8°C in January. Nighttime temperatures can drop, with averages reaching -1°C in January.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Koyasan experiences significant rain/snowfall throughout the year, averaging 1984 mm of precipitation annually. The seasons in Koyasan, bring significant changes in precipitation. The wettest month, June, receives heavy rainfall, with an average of 299 mm of precipitation. This rainfall is distributed across 19 rainy days. In contrast, the driest month, December, experiences much less rainfall, totaling 91 mm over 14 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
In Koyasan, summer days are longer and more sunny, with daily sunshine hours peaking at 7.6 hours in August. As the darker season arrives, the brightness of the sun becomes less. February sees a soft sun for only 4.5 hours per average day.Monthly hours of sunshine
Daily hours of sunshine
Average humidity
The relative humidity is low throughout the year in Koyasan.
Relative humidity over the year
The best time of year to visit Koyasan in Japan
During the months of May and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in June, July, August and September.
August has an average maximum temperature of 32°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 8°C.
June tops the wettest month list with 299 mm of rainfall.
December is the driest month with 91 mm of precipitation.
August is the sunniest month with an average of 228 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
