Mild
Average highs are around 24°C, so days are mild rather than hot.
Weather Guide
Karuizawa, Japan Average Monthly Weather
Weather score29Poor annual avg
Best months: August, July, December
Across the year, average daytime temperatures are around 12°C, sunshine averages 5h per day, and rainfall totals about 1430mm.
Annual weather
Annual averages
Temp
12°C
Rain
1430mm
Annual total
Sun
5h
Weather score
29
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 209mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.1h per day, enough for a balanced month.
Map
Weather map
Compare Karuizawa, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August24°C average high
August is one of Karuizawa's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August209mm average rain
August is one of Karuizawa's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to March and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August5.1 hours average sun
August sits close to Karuizawa's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMarch to May
This stretch has the strongest sunshine in the monthly averages.
Weather score
August43 weather score
August is one of Karuizawa's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
