Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
Weather Guide
Yakushima, Japan Average Monthly Weather
Weather score34Poor annual avg
Best months: August, July, September
Across the year, average daytime temperatures are around 19°C, sunshine averages 4.5h per day, and rainfall totals about 3444mm. Sea temperatures average 24°C across the year.
Annual weather
Annual averages
Temp
19°C
Rain
3444mm
Annual total
Sun
4.5h
Sea
24°C
Weather score
34
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 260mm, so showers are a real planning factor.
Some sun
Sunshine averages 6.5h per day, enough for a balanced month.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Yakushima, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August27°C average high
August is one of Yakushima'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
August260mm average rain
August sits on the drier side of Yakushima's year, which helps with sightseeing and transfers.
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
August6.5 hours average sun
August is one of Yakushima's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August29°C average sea
August is one of Yakushima's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 28°C in this stretch, so swimming comfort is at its strongest.
Weather score
August61 weather score
August is one of Yakushima's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to September
These months have the strongest weather score in the monthly averages.
