Click on a day for an hourly weather forecast
The weather in Japan in September is hot. The average temperatures are between 21°C and 27°C.
You can expect rain for roughly half of the month of September in Japan. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Japan in September 2024.
If you’re planning to visit Japan in the near future, we highly recommend that you review the 14 day weather forecast for Japan before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 9° / 2° | 5 | 22 | 4 | 90 mm | Bad | Japan in January |
| February | 10° / 3° | 6 | 18 | 5 | 127 mm | Bad | Japan in February |
| March | 13° / 6° | 8 | 22 | 1 | 192 mm | Bad | Japan in March |
| April | 18° / 10° | 7 | 23 | 0 | 201 mm | Ok | Japan in April |
| May | 23° / 16° | 8 | 23 | 0 | 190 mm | Good | Japan in May |
| June | 25° / 19° | 8 | 22 | 0 | 258 mm | Good | Japan in June |
| July | 29° / 24° | 8 | 23 | 0 | 192 mm | Ok | Japan in July |
| August | 31° / 25° | 7 | 24 | 0 | 158 mm | Ok | Japan in August |
| September | 27° / 21° | 8 | 22 | 0 | 248 mm | Good | Japan in September |
| October | 22° / 15° | 7 | 24 | 0 | 286 mm | Ok | Japan in October |
| November | 17° / 11° | 5 | 25 | 0 | 121 mm | Good | Japan in November |
| December | 12° / 5° | 5 | 25 | 1 | 99 mm | Ok | Japan in December |