Nikko weather in September
September in Nikko: nice, soaked, with clean air — fine if you can take 23 rainy days.
#6 of 12 months in Nikko · #627 of 897 destinations to visit in September · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Nikko in September
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Nikko climate normals — September
| Daytime high | 24°C / 75°F | 😎 nice |
|---|---|---|
| Nighttime low | 18°C / 64°F | |
| Rainfall | 233 mm / 9.2 in | ⛈ soaked |
| Rainy days | 23 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 19°C / 67°F | |
| Sunshine | 7.7 h/day | |
| Daylight | 12.4 h | |
| Wind | 8 km/h / 5 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Nikko in September — FAQ
- Is September a good time to visit Nikko?
- September in Nikko: nice, soaked, with clean air — fine if you can take 23 rainy days. It ranks #6 of 12 months for Nikko on SeasonMap's comfort score (73/100).
- What is the weather like in Nikko in September?
- In September, Nikko averages a daily high of 23.8°C and a low of 17.8°C, with about 233.4 mm of rain over roughly 22.8 rainy days.
- What is the air quality in Nikko in September?
- Nikko has a mean US Air Quality Index of about 38 in September.