September · Japan
Best time to visit Niseko in September Weather, crowds & prices
Weather in Niseko in September
Average temperature 18°C, 134 mm of rain, about 14 days with 6+ hours of sunshine and 81% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
1.6/10
Ranked #10 of 12 months
- Avg temp
- 18°C
- Rainfall
- 134 mm
- Humidity
- 81%
- Days with 6h+ sun
- 14
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Niseko scores 1.6/10 for snow and ski travel - ranked #10 of 12. Expect around 18°C, 134 mm of rain, and roughly 14 days with 6+ hours of sunshine this month.
Niseko is Hokkaido's powder capital, famous for deep dry snow on Mount Annupuri and onsen evenings in Hirafu. Best window: the core winter snow season, with shoulder weeks for quieter slopes.
September in Niseko — off-season conditions
Temperatures hover around 18°C (64°F) — the kind of month where neither heat nor cold forces the schedule.
134 mm of rain signals a properly wet month, with only about 14 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 1.6/10 on the same scale — 10th of 12 months, versus 9.2/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a waterproof shell rather than an umbrella.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, January is materially better in Niseko — 7.6 points higher on the same scale.
Frequently asked
- What is the weather like in Niseko in September?
- In September, Niseko averages 18°C, 134 mm of rain, and about 14 days with 6+ hours of sunshine. Its climate-comfort score is 1.6/10.
- Is September a good time to visit Niseko?
- September earns a 1.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Niseko in September?
- Expect about 134 mm of rain in September. Average humidity is 81% and there are about 14 days with 6+ hours of sunshine.
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