Koshu Climate by Month
The temperature in Koshu can vary greatly throughout the year.
The temperatures shift from warm
to cold.
It is also known for its large amounts of rain/snowfall.
Let's now guide you through the climate details for a complete overview.
Average day and night temperature
Depending on the time of the year, temperatures range from comfortable to chilly in Koshu. Typically, daytime temperatures range from a comfortable 27°C in August to a chilly 4°C in the coolest month, January. Nights are cooler, with temperatures generally dropping to -6°C, particularly during the colder months.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Koshu has a relatively rain/snowy climate with high precipitation levels, averaging 1869 mm of rain/snowfall annually. The climate in Koshu shows significant variation throughout the year. Expect heavy rainfall in September, with an average of 240 mm of precipitation over 19 rainy days. In contrast, December offers drier and sunnier days, with around 66 mm of snow/rainfall over 10 snowy/rainy days.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
Koshu offers a pleasant mix of sunny and slightly overcast days. The difference in sunshine hours between August (6.7 hours daily) and June (5.0 hours daily) provides a bit of variety for visitors and residents.Monthly hours of sunshine
Daily hours of sunshine
Average humidity
The relative humidity is low throughout the year in Koshu.
Relative humidity over the year
The best time of year to visit Koshu in Japan
During the months of June and September 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:
Rainy season in Koshu occurs in the months of May, June, July, August, September and October.
August has an average maximum temperature of 27°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 4°C.
September tops the wettest month list with 240 mm of rainfall.
December is the driest month with 66 mm of precipitation.
August is the sunniest month with an average of 201 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.
