Cool
Average highs are around 19°C, so pack for cooler days.
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
Trip feel
Showers
Rainfall averages 134mm, so some wet days are possible.
Some sun
Sunshine averages 5h per day, enough for a balanced month.
Swimmable
Sea temperatures average 23°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
October19°C average high
October is close to Aso's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
October134mm average rain
October sits on the drier side of Aso's year, which helps with sightseeing and transfers.
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
October5 hours average sun
October is brighter than Aso's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsApril to May, July to August, and October
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
October23°C average sea
October sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
October39 weather score
October sits close to Aso's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJuly to September
These months have the strongest weather score in the monthly averages.
