Summer in Japan The summer season starts with rain in June, while most of July and a little of August are characterized by hot and humid days. Most visitors visiting Japan around this time head to the beaches, lakes, and rivers.

August is consistently the hottest and most humid month in Japan, with temperatures in major cities like Tokyo, Kyoto, and Osaka frequently exceeding 35°C (95°F). The heat is intensified by extreme humidity, often hovering around 80%, which can push the "feels like" temperature into the 40s (105°F+). This period coincides with the "Obon" holiday week in mid-August, making it both the hottest and one of the busiest times to travel. Kyoto is particularly famous for its stifling summer heat due to its "basin" geography, which traps hot air with very little breeze. While July is also very hot, it often starts with the "Tsuyu" (rainy season), whereas August is characterized by clear, scorching skies and the risk of sudden typhoons. For travelers in 2026, visiting in August requires aggressive hydration, frequent breaks in air-conditioned spaces, and the use of "cool-tech" clothing or portable fans. If you want to avoid the extreme heat, heading north to Hokkaido or into the Japanese Alps is the recommended strategy, as these regions offer a significantly more temperate climate even during the height of the Japanese summer.