Mild
Average highs are around 21°C, so days are mild rather than hot.
January verdict
Hachijojima, Japan in January
Weather score35Poor
Poor for holiday weather
Average highs are around 21°C, so days are mild rather than hot. Sunshine averages 0h per day, so this is not one of the brighter months. Rainfall averages 90mm, so some wet days are possible.
January weather
Monthly averages
Temp
21°C
Rain
90mm
Sun
0h
Sea
20°C
Weather score
35
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 90mm, so some wet days are possible.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 20°C, so the water can feel cool.
Map
Weather map
Compare Hachijojima, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
January21°C average high
January is cooler than the yearly average, which can make sightseeing feel gentler than in hotter months.
Warmest monthsJuly to October
This stretch sets the upper range for average daytime heat.
Rain
January90mm average rain
January is one of Hachijojima's driest months, making outdoor days easier to plan than in wetter parts of the year.
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
January0 hours average sun
January 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
January20°C average sea
January is one of the coolest sea months, so the water may feel fresher than in peak months.
Warmest seaJuly to October
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
January35 weather score
January is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
