June Weather in Japan
June is the start of summer in Japan. Average temperatures are high, and so are humidity levels, although not as intense as they’ll become in July and August. Average highs across most of Honshu, Kyushu, and Shikoku sit in the high 70s and low 80s F (25-27° C), and overnight lows are not significantly lower. The humidity in many parts of the country, especially from Tokyo south, makes the temperatures seem hotter. Sapporo, on the northern island of Hokkaido, is much cooler than other major cities, with an average June high of 70° F (21° C), but that may be a welcome break for many travelers.
The rainy season begins in the sub-tropical and tropical islands of Okinawa in May, but ends in late June. Hokkaido doesn’t experience the rainy season, but most of the rest of Japan experiences increased rain from mid-June. It doesn’t necessarily rain every day, but it’s usually overcast and damp if not raining.
Credits to: Kimkim