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Japan Hits 40°C for the First Time Under Its New 'Cruelly Hot Day' Category

The Guardian·Monday, 27 July 2026
Japan Hits 40°C for the First Time Under Its New 'Cruelly Hot Day' Category

Japan recorded its first official 'kokushobi' — a term coined in April for days above 40 degrees Celsius — as cities sweltered in extreme heat. The Japan Meteorological Agency created the new designation because such temperatures, once rare, are becoming more frequent. Workers are being advised to wear shorts to the office.

Why It Matters

Extreme heat events are hitting Asia hard, and India is no stranger to deadly heatwaves. Japan's new official heat category reflects how governments are being forced to adapt to a hotter world.

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