Generally, divers tend to purchase a wet suit next. As a dive's skills increase, he moves on to purchase equipment like regulators. As scuba diving gains popularity isn't necessarily translated to increased diving gear sales. Because of this, northern Japan, located in the north temperate zone, experiences temperatures that range from cool to cold, while southern Japan, located near the Tropic of Cancer, experiences tropical temperatures. Areas affected by monsoons from the Asian continent experience severe winters, despite being located in the temperate zone.
Summers are humid and hot.
Most areas of Japan have a rainy season, known as tsuyu, sometime during June and July. And, occasional typhoons, spawned by tropical lows during August through October, bring heavy rains and high winds to some areas. Therefore, the peak season for marine sports begins at the end of the rainy season in mid-July, and runs to early September when the hot weather ends. December through March is the off season. The southeast side of Japan faces the Pacific Ocean, while the northwest side faces the Japan Sea.