Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
Weather Guide
Amami Oshima, Japan Average Monthly Weather
Weather score42Mixed annual avg
Best months: July, October, September
Across the year, average daytime temperatures are around 23°C, sunshine averages 4.2h per day, and rainfall totals about 2783mm. Sea temperatures average 25°C across the year.
Annual weather
Annual averages
Temp
23°C
Rain
2783mm
Annual total
Sun
4.2h
Sea
25°C
Weather score
42
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 298mm, so showers are a real planning factor.
Some sun
Sunshine averages 6.5h per day, enough for a balanced month.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Amami Oshima, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August30°C average high
August is one of Amami Oshima'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
August298mm average rain
August sits near Amami Oshima's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
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
August6.5 hours average sun
August is brighter than Amami Oshima's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August29°C average sea
August is one of Amami Oshima's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 28°C in this stretch, so swimming comfort is at its strongest.
Weather score
August51 weather score
August scores above Amami Oshima's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to October
These months have the strongest weather score in the monthly averages.
