Japan faces extreme heatwave with temperatures up to 38 °C

A high‑pressure system over the Pacific has driven a heatwave across Japan in mid‑July 2026. Forecasts and observations show daytime highs above 35 °C in much of the Kanto, Tokai and Kansai regions, with peak temperatures of 38 °C recorded in cities such as Kyoto, Osaka and Takasaki. Central Tokyo experienced its first 35 °C day of the year, triggering the Japan Meteorological Agency’s first “extremely hot day” warning for the capital. Heat‑stroke alerts were issued in multiple prefectures, including Hiroshima, Fukui and Tochigi, and authorities advised staying indoors, staying hydrated and limiting outdoor activity during peak hours.

Research cited by Climate Central links the soaring daytime and nighttime temperatures to climate‑change‑driven sleep loss, estimating that high nighttime temperatures can cut several hours of sleep per year for many people. The combined effect of the heatwave and humidity has raised concerns about health, especially for elderly and children, as well as increased demand for cooling solutions and hydration products.

Officials continue to monitor the situation as the heat is expected to persist through the week, with humid nights remaining above 25 °C, further increasing the risk of heat‑related illnesses.