Weather Forecast Japan October 2025. Get the monthly weather forecast for tokyo, tokyo, japan, including daily high/low, historical averages, to help you plan ahead. In general, the average temperature in hiroshima at the beginning of october is 23.3 ° c.

Japan weather in october 2025. As the month progressed, temperatures tended to moderately fall, reaching an average of 21.4 ° c by.