Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
Weather Guide
Hachijojima, Japan Average Monthly Weather
Weather score51Mixed annual avg
Best months: August, July, September
Across the year, average daytime temperatures are around 25°C, sunshine averages 0h per day, and rainfall totals about 1959mm. Sea temperatures average 23°C across the year.
Annual weather
Annual averages
Temp
25°C
Rain
1959mm
Annual total
Sun
0h
Sea
23°C
Weather score
51
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 140mm, so some wet days are possible.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Warm sea
Sea temperatures average 28°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Hachijojima, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August30°C average high
August is one of Hachijojima's warmest months, with daytime heat above the yearly average.
Warmest monthsJuly to October
This stretch sets the upper range for average daytime heat.
Rain
August140mm average rain
August sits on the drier side of Hachijojima's year, which helps with sightseeing and transfers.
Driest monthsJanuary to March, August, and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August0 hours average sun
August is close to Hachijojima's usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
August28°C average sea
August is one of Hachijojima's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
August69 weather score
August is one of Hachijojima's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
