Overview

• Japan’s June–August average temperature was 2.36°C above normal, the highest since records began in 1898, exceeding the previous highs set in 2023 and 2024.
• Out of 914 observation points nationwide, 207 registered all-time highs, with several locations topping 40°C according to the meteorological agency.
• On September 1, Nagoya hit 38.2°C and Tajimi 38.1°C, with Nagoya and Gifu City setting September records as both marked an 18th consecutive day of 35°C or higher and temperatures above 35°C are forecast again on September 2.
• Heat-related emergencies remain elevated, with preliminary data showing 5,585 transports in Aichi and 1,615 in Gifu from May to August 24, including 8 and 3 deaths confirmed on initial examination respectively.
• Meteorological analyses cite a warmer atmosphere and seas, a northward-shifted jet stream, and an expanded Pacific high as key drivers, and parallel reporting notes the UK also recorded its warmest summer on record with greatly increased odds due to human-caused warming.