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The cherry blossoms are nice, but when I lived there I found that the only month with really nice weather was October. It is still cold and rainy in April in Tokyo/Yokohama. October will likely be sunny and in the 70's...
It would probably help if you said where in Japan you were planning to travel to. Most people think because Japan is so small that the climate is the same throughout the country. This is definitely not the case. Japan has very varied climates from Okinawa to Hokkaido. In October in Tokyo/Yokohama it definitely is not hot and muggy nor is there any snow.