Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
Weather Guide
Aso, Kumamoto, Japan Average Monthly Weather
Weather score31Poor annual avg
Best months: August, July, September
Across the year, average daytime temperatures are around 16°C, sunshine averages 4.6h per day, and rainfall totals about 2698mm. Sea temperatures average 20°C across the year.
Annual weather
Annual averages
Temp
16°C
Rain
2698mm
Annual total
Sun
4.6h
Sea
20°C
Weather score
31
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 305mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.6h 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 Aso, Kumamoto, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August27°C average high
August is one of Aso'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
August305mm average rain
August 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
August5.6 hours average sun
August is one of Aso's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsApril to May, July to August, and October
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August28°C average sea
August 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
August56 weather score
August is one of Aso'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.
