Temperatures in the cities often reach into the high 20s and sometimes 30s, but with high humidity present, it feels much hotter.
Summer: Japan's summers are hot, humid, and often wet. Temperatures in the cities often reach into the high 20s and sometimes 30s, but with high humidity present, it feels much hotter. Summer is a great time to head to the mountains and the countryside to escape the urban heat. Between July and October, the coast of Japan is under the threat of typhoons and heavy rains, although the wettest months are usually August and September.