Weather in Hiroshima in September
September in Hiroshima is mild with average temperatures around 21.7°C (71.1°F). Expect significant rainfall with 170mm across approximately 13 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
26.0°C
78.8°F
Low
17.4°C
63.3°F
Precipitation
170 mm
6.7 inches
~13 rainy days
Conditions
Humidity
83%
Comparison to Adjacent Months
September is 4.0°C cooler than August, 47mm wetter than August.
September is 5.8°C warmer than October, 57mm wetter than October.