Japan recorded 41,174 hospital transports for heatstroke in July, the third-highest July figure since the Fire and Disaster Management Agency began tracking the data in 2008. The agency confirmed 79 deaths as temperatures across much of the country regularly exceeded 35 degrees Celsius.
The July total trails only 2018, when 54,220 people were hospitalized, and 2024, when the figure reached 43,195. The numbers underscore Japan’s deepening vulnerability to extreme summer heat, driven by climate change and an aging population that is especially susceptible to heat-related illness.
Elderly Bear the Brunt
People aged 65 or older accounted for 24,769 of the total, more than 60 percent. Japan’s demographic crisis, with nearly 30 percent of the population over 65, amplifies the health toll of each summer heatwave. The elderly are more prone to dehydration and heat exhaustion, and many live alone in homes without adequate air conditioning.
The agency urged the public to stay hydrated and use air conditioning when necessary. Municipal cooling shelters, equipped with climate-control systems, have been set up across the country but remain underused, particularly in rural areas where the elderly population is concentrated.
Regional Hotspots
The data adds to a grim picture of Japan’s summer. In mid-July, a single week saw more than 10,000 heatstroke transports, with 14 deaths and 321 people classified as seriously ill. Osaka recorded the highest single-prefecture toll, followed by Aichi and Tokyo. In Tokyo alone, 453 people were hospitalized for heatstroke on a single day during the peak week.
The Japan Meteorological Agency reported that on July 14, 170 of the country’s 914 observation stations registered temperatures of 35 degrees Celsius or higher, classified in Japan as extreme heat days. Parts of the Tokai region, including Hamamatsu in Shizuoka Prefecture, recorded temperatures exceeding 41 degrees Celsius.
A Pattern Intensifying
Heatwaves are becoming more frequent and more severe across Japan. The 2018 figure of 54,220 hospital transports, at the time a record, shocked the nation and prompted the government to expand its network of cooling shelters and public awareness campaigns. Yet the trend has continued, with 2024 and now 2026 posting among the highest July totals ever recorded.
The escalating toll comes as Japan simultaneously confronts other climate-related challenges, from intensifying typhoons to prolonged drought affecting the Danube region’s nuclear output. The country’s aging infrastructure, including many homes built before modern cooling standards, adds to the difficulty of protecting vulnerable residents.
Officials said heatstroke alerts were issued across dozens of prefectures through late July, covering areas from the Kanto region through Okinawa. With August typically the hottest month in much of Japan, health authorities warned that the danger is far from over.
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