Nagasaki weather in May
May in Nagasaki: nice, soaked, with very humid — fine if you can take 13 rainy days.
#4 of 12 months in Nagasaki · #600 of 897 destinations to visit in May · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Nagasaki in May
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Nagasaki climate normals — May
| Daytime high | 21°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 17°C / 63°F | |
| Rainfall | 223 mm / 8.8 in | ⛈ soaked |
| Rainy days | 13 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 16°C / 60°F | |
| Sunshine | 8.6 h/day | |
| Daylight | 13.8 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 65 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Nagasaki in May — FAQ
- Is May a good time to visit Nagasaki?
- May in Nagasaki: nice, soaked, with very humid — fine if you can take 13 rainy days. It ranks #4 of 12 months for Nagasaki on SeasonMap's comfort score (78/100).
- What is the weather like in Nagasaki in May?
- In May, Nagasaki averages a daily high of 21.4°C and a low of 17.3°C, with about 222.7 mm of rain over roughly 12.6 rainy days.
- What is the air quality in Nagasaki in May?
- Nagasaki has a mean US Air Quality Index of about 65 in May.