Water temperature of the Sea of Japan in april Where to swim in the Sea of Japan in april 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 april.
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 april.
The seasonal average for the water temperature in the month of april is between 34°F and 61°F. The lowest sea temperature measured this month is 32°F and the highest is 64°F.
The sea temperature map of the Sea of Japan in april
The map below presents a monthly average of the water temperature of the Sea of Japan for the month of april 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 april.
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWhere can you swim in the Sea of Japan in april?
Below, see the average temperatures measured in april in the different countries on the shores of the Sea of Japan.
South Korea
51°F to 60°F
cold swimmingJapan
42°F to 61°F
cold swimmingRussia
34°F to 38°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: