Hakone weather in September
September in Hakone: nice, soaked, with clean air — fine if you can take 17 rainy days.
#2 of 12 months in Hakone · #567 of 897 destinations to visit in September · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Hakone in September
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Hakone climate normals — September
| Daytime high | 23°C / 73°F | 😎 nice |
|---|---|---|
| Nighttime low | 18°C / 64°F | |
| Rainfall | 209 mm / 8.2 in | ⛈ soaked |
| Rainy days | 17 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 12.4 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Hakone in September — FAQ
- Is September a good time to visit Hakone?
- September in Hakone: nice, soaked, with clean air — fine if you can take 17 rainy days. It ranks #2 of 12 months for Hakone on SeasonMap's comfort score (77/100).
- What is the weather like in Hakone in September?
- In September, Hakone averages a daily high of 22.9°C and a low of 17.8°C, with about 208.7 mm of rain over roughly 16.6 rainy days.
- What is the air quality in Hakone in September?
- Hakone has a mean US Air Quality Index of about 39 in September.