Japan Weather In September 2024. In september, temperatures tend to be around 23ºc to 28ºc (73°f to 82°f) in the afternoon and drop to about 18ºc to 21ºc (64°f to 70°f) in the morning and at night. Here you can find all information about the weather in japan in september:

Weather in japan in september 2024. Tokyo weather in september 2024.