The Japan Meteorological Agency (JMA) has reported that this summer, spanning from June to August, has matched the record high temperatures set last year, marking the hottest season in Japan since records began in 1898. This year’s extreme heat, described by the JMA as “abnormal weather,” has been attributed to an unusually powerful Pacific high-pressure system that enveloped the archipelago throughout the summer.
Analysis reveals that the average temperature across 15 locations, chosen for their minimal urban influence, was 1.76 degrees Celsius above the 30-year average (1991-2020), equating to the record temperatures seen last year. This trend was echoed nationwide, with all regions experiencing significant heat. Western Japan and Okinawa/Amami saw temperatures 1.4°C and 0.9°C above their historical averages, respectively, both marking record highs since record-keeping began. Eastern Japan matched its highest-ever temperature, with a 1.7°C increase, while Northern Japan recorded a 2.3°C rise, the second highest on record.
Out of 914 weather monitoring locations across Japan, 144 reported their highest-ever temperatures. Sano City in Tochigi Prefecture recorded a staggering 41.0°C on July 29, tying for the second highest temperature ever documented in the country. The number of locations experiencing extreme heat days soared to 8,821, surpassing the previous record of 6,692 set last summer and exceeding any figures since the introduction of current statistical methods in 2010.
The JMA’s findings underscore the severity of this summer’s heatwave and its impact on Japan’s climate. With heatwaves becoming increasingly frequent and intense, these extreme temperatures highlight the pressing need for continued climate adaptation and mitigation efforts.
The Japan Meteorological Agency has also noted that the prolonged heatwave has intensified concerns about the impacts on public health and infrastructure. The record-breaking temperatures have led to increased cases of heat-related illnesses and put significant strain on the country’s power grid. In response, local authorities are implementing measures to protect vulnerable populations, such as expanding cooling centers and adjusting work hours to avoid peak heat periods. The agency’s findings highlight the urgent need for enhanced climate resilience strategies as Japan continues to face the growing challenges of extreme weather events.