The Japan Meteorological Agency and local health authorities have issued heat-stroke warnings as temperatures may reach or exceed 40 °C [1].
This weather event marks the first occurrence of an “extremely hot day” (酷暑日) for the year. The intensity of the heat poses a significant public health risk, prompting officials to call for strict vigilance against heat-stroke across the Kanto and Tokai regions.
Forecasters attribute the spike to a strong, high-pressure ridge dominating the area [3]. This atmospheric condition is producing intense sunshine and unprecedented heat levels. In the Kanto region, which includes Tokyo, the city has already experienced two consecutive days of extremely hot weather [1].
Temperature readings vary by location. Some reports indicate that inland areas are forecast to reach approximately 38 °C [4]. However, other meteorological data suggests temperatures in these same inland zones could reach or exceed 40 °C [1].
In the Tokai region, specific areas have already seen extreme spikes. While some reports said temperatures had exceeded 39 °C without hitting the 40-degree mark [2], KSB News said the temperature in Gujo Hachiman, Gifu prefecture, actually reached 40 °C [5].
If the 40 °C threshold is officially observed, it would be the first such “extremely hot day” since the term was introduced nine years ago [1].
Local authorities are urging residents to take immediate precautions. “Strict vigilance against heat-stroke is necessary,” MSN Japan said [6]. The warnings remain in effect for the period from July 21 to July 23 [7].
“Temperatures may reach or exceed 40 °C in the Kanto and Tokai regions.”
The arrival of 40 °C temperatures in central Japan signifies a critical threshold in summer weather patterns. By triggering the 'extremely hot day' classification for the first time this year, the event highlights the increasing volatility of regional climates and the immediate pressure on urban infrastructure and public health systems to manage extreme heat in densely populated areas like Tokyo and Nagoya.
