Karuizawa Climate by Month
Karuizawa experiences great temperature shifts.
The city's weather can transition from warm days
to cold weather.
It is also known for its large amounts of rain/snowfall.
Now, let’s explore all the climate details to give you a full picture.
Average day and night temperature
The climate in Karuizawa is known for significant temperature differences throughout the year, making the weather dynamic. Typically, daytime temperatures range from a comfortable 28°C in August to a chilly 4°C in the coolest month, January. Nights are cooler, with temperatures generally dropping to -5°C, particularly during the colder months.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Karuizawa has a notably wet climate with abundant precipitation, recording 1785 mm of rain/snowfall per year. The climate in Karuizawa shows significant variation throughout the year. Expect heavy rainfall in July, with an average of 255 mm of precipitation over 23 rainy days. In contrast, December offers drier and sunnier days, with around 63 mm of snow/rainfall over 15 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
Karuizawa offers a pleasant mix of sunny and slightly overcast days. The difference in sunshine hours between May (7.0 hours daily) and January (4.3 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 moderate throughout the year in Karuizawa.
Relative humidity over the year
The best time of year to visit Karuizawa in Japan
During the months of May, 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 Karuizawa occurs in the months of May, June, July, August, September and October.
August has an average maximum temperature of 28°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 4°C.
July tops the wettest month list with 255 mm of rainfall.
December is the driest month with 63 mm of precipitation.
May is the sunniest month with an average of 209 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.
