Shimonoseki Water Temperature
The water will feel warm (balmy). Most people will be OK with just bathers / swimming costume at this temperature. If you intend to stay in the water for a while a thin shorty wetsuit will suffice.
The measurements for the water temperature in Shimonoseki, Yamaguchi 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 Shimonoseki water temperature derived from many years of historical sea surface temperature data.
The warmest water temperature is in August with an average around 81.3°F / 27.4°C. The coldest month is March with an average water temperature of 56.8°F / 13.8°C.
7 day tide forecast for Shimonoseki
*These tide times are estimates based on the nearest accurate location (Dannoura, Yamaguti, 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.