Mild
Average highs are around 24°C, so days are mild rather than hot.
September verdict
Aso, Kumamoto, Japan in September
Weather score48Mixed
Mixed for holiday weather
Average highs are around 24°C, so days are mild rather than hot. Sunshine averages 4.6h per day, so this is not one of the brighter months. Rainfall averages 234mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
24°C
Rain
234mm
Sun
4.6h
Sea
26°C
Weather score
48
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 234mm, so showers are a real planning factor.
Limited sun
Sunshine averages 4.6h per day, so this is not one of the brighter months.
Swimmable
Sea temperatures average 26°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Aso, Kumamoto, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September24°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
September234mm average rain
September sits near Aso's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to April and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.6 hours average sun
September sits close to Aso's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to May, July to August, and October
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September26°C average sea
September is one of Aso's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
September48 weather score
September scores above Aso'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.
