Nagasaki weather in August
August in Nagasaki: hot, soaked, with clean air — a gamble, with 17 rainy days.
#11 of 12 months in Nagasaki · #825 of 897 destinations to visit in August · comfort 53/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Nagasaki in August
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Nagasaki climate normals — August
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Rainfall | 390 mm / 15.4 in | ⛈ soaked |
| Rainy days | 17 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 25°C / 77°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 13.3 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Nagasaki in August — FAQ
- Is August a good time to visit Nagasaki?
- August in Nagasaki: hot, soaked, with clean air — a gamble, with 17 rainy days. It ranks #11 of 12 months for Nagasaki on SeasonMap's comfort score (53/100).
- What is the weather like in Nagasaki in August?
- In August, Nagasaki averages a daily high of 29.3°C and a low of 26.1°C, with about 390.2 mm of rain over roughly 17 rainy days.
- What is the air quality in Nagasaki in August?
- Nagasaki has a mean US Air Quality Index of about 48 in August.