Niseko weather in May
May in Niseko: nice, rainy, with clean air — not the best time to visit.
#8 of 12 months in Niseko · #893 of 897 destinations to visit in May · comfort 36/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
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Niseko climate normals — May
| Daytime high | 17°C / 63°F | 😎 nice |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Rainfall | 83 mm / 3.3 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 9°C / 47°F | |
| Sunshine | 10.5 h/day | |
| Daylight | 14.7 h | |
| Wind | 14 km/h / 9 mph | |
| Snowfall | 0.2 cm / 0.1 in | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Niseko in May — FAQ
- Is May a good time to visit Niseko?
- May in Niseko: nice, rainy, with clean air — not the best time to visit. It ranks #8 of 12 months for Niseko on SeasonMap's comfort score (36/100).
- What is the weather like in Niseko in May?
- In May, Niseko averages a daily high of 17.4°C and a low of 8°C, with about 83.2 mm of rain over roughly 13.8 rainy days.
- What is the air quality in Niseko in May?
- Niseko has a mean US Air Quality Index of about 44 in May.