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Japan Hits 40°C for the First Time Under a New 'Cruelly Hot Day' Warning System

The Guardian·Sunday, 26 July 2026
Japan Hits 40°C for the First Time Under a New 'Cruelly Hot Day' Warning System

Japan recorded its first official 'kokushobi' — a newly coined term for days above 40 degrees Celsius — since the designation was introduced in April. The Japan Meteorological Agency created the label to warn the public about extreme heat days that were once rare but are becoming more common. Workers were advised to wear shorts to the office to cope.

Why It Matters

Extreme heat is a growing global reality, and Japan's formal naming of a new heat category signals how seriously governments need to start treating it as a routine danger.

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