Cool
Average highs are around 4°C, so pack for cooler days.
March verdict
Poor for holiday weather
Average highs are around 4°C, so pack for cooler days. Sunshine averages 5.7h per day, enough for a balanced month. Rainfall averages 70mm, which is relatively low for holiday planning.

Monthly averages
Temp
4°C
Rain
70mm
Sun
5.7h
Weather score
28
Poor
Cool
Average highs are around 4°C, so pack for cooler days.
Drier
Rainfall averages 70mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 5.7h per day, enough for a balanced month.
Map
Compare Karuizawa, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
March4°C average high
March is on the cooler side of Karuizawa's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
March70mm average rain
March sits on the drier side of Karuizawa's year, which helps with sightseeing and transfers.
Driest monthsJanuary to March and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
March5.7 hours average sun
March is brighter than Karuizawa's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMarch to May
This stretch has the strongest sunshine in the monthly averages.
March28 weather score
March scores below Karuizawa's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.