JP Regional Outlook
JP Regional Outlook
White Paper Global Energy Trends 2026
The summer of 2025 was the hottest ever recorded in Japan, with the nationwide average 2.36 degrees Celsius hotter than average since records began in 1898. The central city of Isesaki, northwest of Tokyo in Gunma Prefecture, setting a new national record high of 41.8 Celsius (107.2 Fahrenheit) on August 5.
The Japanese Meteorological Agency (JMA) said in summer 2025, Japan experienced above-normal surface air temperatures in northern, eastern and western Japan, and significantly high temperatures from mid-June to early August. On 5 August, a new national daily maximum temperature of 41.8°C was recorded at Isesaki in Gunma Prefecture, north of Tokyo, accompanied by unprecedented cumulative numbers of weather stations observing daily maximum temperatures exceeding 35°C. In July, record-dry conditions were observed over parts of the country due to an inactive Baiu front and a suppressed supply of moisture. The nation’s Hokuriku and Kyushu regions experienced heavy rainfall in the first half of August.
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