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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.
In the southern and western parts of Japan it is typically dry and often sunny, with temperatures ranging from 32 to 59 degrees (note that all temperatures are shown as Fahrenheit). In northern Japan and in the mountains winters are just that, with snow and the cold weather typically lasting until the end of April.