Cool
Average highs are around 18°C, so pack for cooler days.
December verdict
Amami Oshima, Japan in December
Weather score32Poor
Poor for holiday weather
Average highs are around 18°C, so pack for cooler days. Sunshine averages 2.5h per day, so this is not one of the brighter months. Rainfall averages 146mm, so some wet days are possible.
December weather
Monthly averages
Temp
18°C
Rain
146mm
Sun
2.5h
Sea
23°C
Weather score
32
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 146mm, so some wet days are possible.
Limited sun
Sunshine averages 2.5h per day, so this is not one of the brighter months.
Swimmable
Sea temperatures average 23°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Amami Oshima, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December18°C average high
December is on the cooler side of Amami Oshima's year, useful if you prefer less intense daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December146mm average rain
December is one of the drier months, but average rainfall is still high enough to keep backup plans useful.
Driest monthsJanuary to April, July, and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December2.5 hours average sun
December is one of Amami Oshima's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December23°C average sea
December is below Amami Oshima's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 28°C in this stretch, so swimming comfort is at its strongest.
Weather score
December32 weather score
December scores below Amami Oshima's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJune to October
These months have the strongest weather score in the monthly averages.
