June can be nice, but is often rainy (and humid). July and August are very hot and humid, but also lively with lots of festivals. Mid to late September can be nice (if hot), with fewer tourists than summer or fall, though typhoons can sometimes affect plans.

In 2026, the choice between June and July in Japan is a trade-off between rain and heat. June is the height of "Tsuyu" (the rainy season) across most of Honshu, including Tokyo and Kyoto. While it rains frequently, the temperatures are relatively mild (20°C–26°C), and the crowds are significantly thinner, leading to lower hotel prices. It is also the best time to see the stunning hydrangea (ajisai) blooms. Conversely, July is much hotter and more humid (often exceeding 30°C), but it marks the start of the spectacular Japanese Summer Festival season. Major events like Kyoto's Gion Matsuri and massive fireworks displays happen in July. If you are sensitive to heat and want to save money, June is the better choice; if you want the quintessential summer "Matsuri" experience with street food and yukatas, July is the way to go. For those who want to avoid both the rain and the heat in early summer, Hokkaido is the perfect 2026 alternative, as it stays cool and largely misses the rainy season entirely.