Cool
Average highs are around 14°C, so pack for cooler days.
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
Trip feel
Showers
Rainfall averages 125mm, so some wet days are possible.
Limited sun
Sunshine averages 4.3h per day, so this is not one of the brighter months.
Map
Weather map
Compare Karuizawa, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
October14°C average high
October is close to Karuizawa's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
October125mm average rain
October sits near Karuizawa's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
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
October4.3 hours average sun
October is below Karuizawa's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMarch to May
This stretch has the strongest sunshine in the monthly averages.
Weather score
October22 weather score
October is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
