Mild
Average highs are around 26°C, so days are mild rather than hot.
September verdict
Yakushima, Japan in September
Weather score53Mixed
Mixed for holiday weather
Average highs are around 26°C, so days are mild rather than hot. Sunshine averages 5.3h per day, enough for a balanced month. Rainfall averages 330mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
26°C
Rain
330mm
Sun
5.3h
Sea
28°C
Weather score
53
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 330mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.3h per day, enough for a balanced month.
Warm sea
Sea temperatures average 28°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
September26°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September330mm average rain
September sits near Yakushima's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
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
September5.3 hours average sun
September sits close to Yakushima's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September28°C average sea
September 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
September53 weather score
September scores above Yakushima's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJuly to September
These months have the strongest weather score in the monthly averages.
