Water temperature of the Sea of Japan in august Where to swim in the Sea of Japan in august 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 august.

The seasonal average for the water temperature in the month of august is between 63°F and 82°F. The lowest sea temperature measured this month is 57°F and the highest is 86°F.

The sea temperature map of the Sea of Japan in august

The map below presents a monthly average of the water temperature of the Sea of Japan for the month of august 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 august.