The Japan Meteorological Agency introduced a new term for days exceeding 40C after a blistering summer. Summer 2025 saw the highest temperatures since records began, with an average temperature 2.36C higher than average. Tokyo had 25 days above 35C compared to an average of 4.5 days. Kyoto recorded 52 days above the same temperatures, compared to an average of 18.5. This summer, JMA predicts that Japan will experience above-normal temperatures from June to August.
