Niseko weather in September
September in Niseko: nice, rainy, with clean air — not the best time to visit.
#10 of 12 months in Niseko · #896 of 897 destinations to visit in September · comfort 19/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
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Niseko climate normals — September
| Daytime high | 22°C / 72°F | 😎 nice |
|---|---|---|
| Nighttime low | 15°C / 59°F | |
| Rainfall | 109 mm / 4.3 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 16°C / 61°F | |
| Sunshine | 8.4 h/day | |
| Daylight | 12.5 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Niseko in September — FAQ
- Is September a good time to visit Niseko?
- September in Niseko: nice, rainy, with clean air — not the best time to visit. It ranks #10 of 12 months for Niseko on SeasonMap's comfort score (19/100).
- What is the weather like in Niseko in September?
- In September, Niseko averages a daily high of 22.2°C and a low of 15.2°C, with about 109.3 mm of rain over roughly 11.8 rainy days.
- What is the air quality in Niseko in September?
- Niseko has a mean US Air Quality Index of about 32 in September.