Nagasaki weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Good
Best time to visit: April – May, September – November
What is the weather like in Nagasaki in May?
In May, Nagasaki is warm: daytime highs average 21 °C, and nights cool down to about 17 °C. The sea averages 19.7 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 210 mm in total. All in all, May is a good month for a holiday in Nagasaki.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 13 h 49 min05:22 – 19:11
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 66 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %52 %
- Few rainy daysweight 30 %51 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Nagasaki in May: quick answers
Is Nagasaki hot in May?
Warm rather than hot: in May, daytime highs in Nagasaki average 21 °C and nights cool to about 17 °C.
Can you swim in Nagasaki in May?
Only if you don't mind cold water: in May the sea averages just 19.7 °C. Comfortable swimming is possible from June to November.
Does it rain much in Nagasaki in May?
Rain is frequent, with about 11 rainy days and 210 mm in total.
Nagasaki month by month
The whole year in NagasakiAll destinations: JapanWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences