Water temperature of the Sea of Japan in december Where to swim in the Sea of Japan in december 2025?
Several countries border the seaside of the Sea of Japan, including: South Korea, Japan and Russia. We measure the water temperature daily in these countries and archive it in order to calculate monthly averages, like those of the month of december.
Several countries border the seaside of the Sea of Japan, including: South Korea, Japan and Russia.
We measure the water temperature daily in these countries and archive it in order to calculate monthly averages, like those of the month of december.
The seasonal average for the water temperature in the month of december is between 36°F and 66°F. The lowest sea temperature measured this month is 31°F and the highest is 70°F.
The sea temperature map of the Sea of Japan in december
The map below presents a monthly average of the water temperature of the Sea of Japan for the month of december for several coastal cities. You can zoom and move around on the map. By clicking on the markers, you can see sea temperature details by city in december.
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWhere can you swim in the Sea of Japan in december?
Below, see the average temperatures measured in december in the different countries on the shores of the Sea of Japan.
South Korea
52°F to 65°F
cool swimmingJapan
43°F to 66°F
cool swimmingRussia
36°F to 37°F
freezing swimmingWater temperature of the Sea of Japan: choose another month
See monthly seasonal averages of the water temperature of the Sea of Japan by clicking on the links below: