Click on a day for an hourly weather forecast
The temperatures in Niseko in September are usually low and can range between 12°C and 19°C.
You can expect about 3 to 8 days of rain in Niseko during the month of September. 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 Niseko in September 2025.
If you’re planning to visit Niseko in the near future, we highly recommend that you review the 14 day weather forecast for Niseko before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -9° | 4 | 1 | 30 | 192 mm | Awful | Niseko in January |
| February | -4° / -9° | 3 | 1 | 26 | 163 mm | Awful | Niseko in February |
| March | 1° / -5° | 9 | 2 | 24 | 150 mm | Awful | Niseko in March |
| April | 8° / 1° | 9 | 13 | 9 | 119 mm | Awful | Niseko in April |
| May | 15° / 6° | 8 | 22 | 1 | 138 mm | Ok | Niseko in May |
| June | 19° / 11° | 8 | 22 | 0 | 163 mm | Ok | Niseko in June |
| July | 23° / 15° | 9 | 22 | 0 | 193 mm | Good | Niseko in July |
| August | 23° / 16° | 9 | 22 | 0 | 225 mm | Good | Niseko in August |
| September | 19° / 12° | 7 | 23 | 0 | 189 mm | Ok | Niseko in September |
| October | 12° / 6° | 8 | 22 | 1 | 158 mm | Bad | Niseko in October |
| November | 5° / 0° | 10 | 7 | 14 | 223 mm | Awful | Niseko in November |
| December | -2° / -6° | 6 | 1 | 28 | 250 mm | Awful | Niseko in December |