Nagasaki Water Temperature
The water will feel tepid. Swimming will be tolerable without a wetsuit, although it will take a little getting used to. If you intend to stay in the water for a while a 3/2mm wetsuit will be ideal.
The measurements for the water temperature in Nagasaki, Nagasaki are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.
Water temp by month
Monthly average max / min water temperatures
The graph below shows the range of monthly Nagasaki water temperature derived from many years of historical sea surface temperature data.
The warmest water temperature is in August with an average around 81.7°F / 27.6°C. The coldest month is February with an average water temperature of 59.5°F / 15.3°C.
7 day tide forecast for Nagasaki
*These tide times are estimates based on the nearest accurate location (Mizu-No-Ura, Nagasaki, Japan) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.