Cool
Average highs are around 13°C, so pack for cooler days.
December verdict
Yakushima, Japan in December
Weather score19Poor
Poor for holiday weather
Average highs are around 13°C, so pack for cooler days. Sunshine averages 3.4h per day, so this is not one of the brighter months. Rainfall averages 162mm, so some wet days are possible.
December weather
Monthly averages
Temp
13°C
Rain
162mm
Sun
3.4h
Sea
22°C
Weather score
19
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 162mm, so some wet days are possible.
Limited sun
Sunshine averages 3.4h per day, so this is not one of the brighter months.
Swimmable
Sea temperatures average 22°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Yakushima, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December13°C average high
December is on the cooler side of Yakushima's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December162mm average rain
December is one of the drier months, but average rainfall is still high enough to keep backup plans useful.
Driest monthsJanuary to February, August, and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December3.4 hours average sun
December is below Yakushima's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December22°C average sea
December is below Yakushima's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 28°C in this stretch, so swimming comfort is at its strongest.
Weather score
December19 weather score
December scores below Yakushima's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJuly to September
These months have the strongest weather score in the monthly averages.
