Summer in Japan lasts from June to August and is usually a very hot season, with extreme humidity levels and daytime temperatures often higher than 30? (86°F), especially in Tokyo, Kyoto, Osaka, and other metropolitan areas.
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Casual clothing is common in Japan outside of Tokyo's business district. Shorts, jeans, and camisoles are perfectly fine to wear as long as you don't plan on attending religious sites.
Tokyo's humid subtropical climate means hot, muggy summers are unavoidable; the U.S. Southeast and northern India fall into the same climate zone. However, there are other underlying factors exacerbating the conditions.
June-AugustIf you visit during the summer, you'll have to brave not only the crowds – but worse – the heat. With temps in the high 70s and 80s, Tokyo is hot, sticky and filled with sweaty tourists — yes, you'll be one of them.
The rainy season extends into July and it is usually hot and humid with frequent rains. Still, it's possible to travel in Kyoto in July and it's not crowded. The rainy season ends toward the end of the month, and then it becomes sunny, hot and humid.