Niseko weather in August
August in Niseko: warm, soaked, with clean air — not the time — 16 rainy days.
#12 of 12 months in Niseko · #897 of 897 destinations to visit in August · comfort 14/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
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Niseko climate normals — August
| Daytime high | 26°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 67°F | |
| Rainfall | 178 mm / 7 in | ⛈ soaked |
| Rainy days | 16 days | |
| Humidity | 88% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 13.9 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Niseko in August — FAQ
- Is August a good time to visit Niseko?
- August in Niseko: warm, soaked, with clean air — not the time — 16 rainy days. It ranks #12 of 12 months for Niseko on SeasonMap's comfort score (14/100).
- What is the weather like in Niseko in August?
- In August, Niseko averages a daily high of 25.7°C and a low of 19.4°C, with about 178.4 mm of rain over roughly 15.8 rainy days.
- What is the air quality in Niseko in August?
- Niseko has a mean US Air Quality Index of about 28 in August.