Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
Weather Guide
Hiroshima City, Hiroshima, Japan Average Monthly Weather
Weather score38Poor annual avg
Best months: August, September, July
Across the year, average daytime temperatures are around 19°C, sunshine averages 5.2h per day, and rainfall totals about 1607mm. Sea temperatures average 19°C across the year.
Annual weather
Annual averages
Temp
19°C
Rain
1607mm
Annual total
Sun
5.2h
Sea
19°C
Weather score
38
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 125mm, so some wet days are possible.
Some sun
Sunshine averages 6.7h per day, enough for a balanced month.
Swimmable
Sea temperatures average 26°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Hiroshima City, Hiroshima, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August31°C average high
August is one of Hiroshima City'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
August125mm average rain
August sits near Hiroshima City's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to March and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August6.7 hours average sun
August is one of Hiroshima City's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsMay and August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August26°C average sea
August is one of Hiroshima City's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 24°C in this stretch, so swimming comfort is at its strongest.
Weather score
August64 weather score
August is one of Hiroshima City's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsAugust to September
These months have the strongest weather score in the monthly averages.
