TOKYO — At least six people died of heat stroke in Tokyo as Japan swelters under a rare rainy-season heat wave, prompting authorities to issue a flurry of health warnings.

Over the weekend, the central Shizuoka region became the first in Japan to see the mercury reach 40 degrees Celsius (104 Fahrenheit) this year, far surpassing the 35-degree threshold classified by weather officials as "extremely hot."

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