Nagasaki weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: April – May, September – November
What is the weather like in Nagasaki in January?
In January, Nagasaki is cool: daytime highs average 10 °C, and nights cool down to about 7 °C. The sea averages 16.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 11 rainy days and 79 mm in total. All in all, January is not an ideal month for a holiday in Nagasaki.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 40 | 26 | 35 |
| Day | 12° | 10° | 11° |
| Night | 9° | 7° | 7° |
| Sea | 19° | 17° | 16° |
| Sun | 4 h | 3 h | 4 h |
| Rain days | 11 | 11 | 11 |
More details for January
- Daylight
- 10 h 13 min07:23 – 17:35
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 25 km/haverage daily peakAll months
- Cloud cover
- 66 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 1 day1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %20 %
- Sunshineweight 20 %5 %
- 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 January
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Nagasaki in January: quick answers
Is Nagasaki hot in January?
No. In January, Nagasaki is cool: daytime highs average 10 °C and nights drop to about 7 °C.
Can you swim in Nagasaki in January?
Only if you don't mind cold water: in January the sea averages just 16.6 °C. Comfortable swimming is possible from June to November.
Does it rain much in Nagasaki in January?
Rain is frequent, with about 11 rainy days and 79 mm in total.
Nagasaki month by month
The whole year in NagasakiAll destinations: JapanWhere to go in JanuarySea temperature in January
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