Click on a day for an hourly weather forecast
The weather in Japan in August is very hot. The average temperatures are between 25°C and 31°C, drinking water regularly is advisable.
You can expect about 3 to 8 days of rain in Japan during the month of August. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Japan in August 2025.
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 |