Best time to swim in Joetsu in Japan Sea temperature by month

Do you want to swim in the sea in Joetsu in Japan? But when is the best time to go to be sure to have pleasant water for swimming in Joetsu and be able to swim without catching cold? This month, or a different one? The answer is on this page, with the sea water temperature by month in Joetsu, based on the average temperatures recorded in previous years.

Best time to swim in Joetsu: the water temperature by month

Do you feel like swimming in Joetsu in Japan? Discover the average sea temperature for each month of the year (based on previous years' records) and our opinion on swimming in the table below.

Month Sea temperature
January 55°F (min: 51°F/max: 58°F)
February 51°F (min: 48°F/max: 54°F)
March 51°F (min: 49°F/max: 53°F)
April 53°F (min: 50°F/max: 57°F)
May 59°F (min: 52°F/max: 65°F)
June 68°F (min: 61°F/max: 76°F)
July 76°F (min: 71°F/max: 81°F)
August 81°F (min: 78°F/max: 83°F)
September 78°F (min: 74°F/max: 82°F)
October 71°F (min: 67°F/max: 75°F)
November 64°F (min: 60°F/max: 69°F)
December 58°F (min: 53°F/max: 63°F)

Water temperature variation in Joetsu throughout the year

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