Nagasaki weather in December
December in Nagasaki: cool, a little rain, with clean air — a great time to visit.
#6 of 12 months in Nagasaki · #444 of 897 destinations to visit in December · comfort 72/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Nagasaki in December
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Nagasaki climate normals — December
| Daytime high | 12°C / 53°F | 🙂 cool |
|---|---|---|
| Nighttime low | 8°C / 47°F | |
| Rainfall | 71 mm / 2.8 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 67% | 💧 humid |
| Dew point | 4°C / 39°F | |
| Sunshine | 6.1 h/day | |
| Daylight | 10 h | |
| Wind | 24 km/h / 15 mph | |
| Snowfall | 0.4 cm / 0.2 in | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Nagasaki in December — FAQ
- Is December a good time to visit Nagasaki?
- December in Nagasaki: cool, a little rain, with clean air — a great time to visit. It ranks #6 of 12 months for Nagasaki on SeasonMap's comfort score (72/100).
- What is the weather like in Nagasaki in December?
- In December, Nagasaki averages a daily high of 11.8°C and a low of 8.3°C, with about 71.2 mm of rain over roughly 9 rainy days.
- What is the air quality in Nagasaki in December?
- Nagasaki has a mean US Air Quality Index of about 42 in December.