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In the spring, southern and western Japan can be quite warm and sunny, from 59 to 77 degrees. Northern Japan ranges from 50 to 68 degrees. Snow remains on the hills into April or May in northern areas. And like Spring in much of the U.S., weather can range significantly from mild, to warm, to cold, on a daily basis.
Summer in Japan lasts from about June to mid-September, depending on the location. Summers are hot and humid, with temperatures ranging from approximately 70 to 90 Â°F. July and August are usually the hottest and most humid times of year, and can be uncomfortable for sightseeing if you are averse to humidity.ravelers occasionally ask us when the most affordable time to visit Japan is. The fact is, Japanâs âlowâ and âhighâ travel seasons are not as clearly delineated as they are in certain other countries, such as Thailand or Costa Rica, where there are more or less clearly-defined high and low seasons.