Athletes competing at the World Championships in Tokyo will face "heat challenges", says World Athletics president Sebastian Coe.
The nine-day tournament featuring the world's biggest track and field stars begins on Saturday.
Japan has endured its hottest summer since records began in 1898, with temperatures 2.36C above average.
The opening day, which will host the 35km men's and women's race walk, is forecast to be 32C.
"I don't think it's any great secret, we do have some heat challenges in Tokyo," said Coe.
"We had them actually at the time of the Games in 2021."
However, unlike during the pandemic-delayed Games in Japan four years ago, the marathon and race walk events will remain in Tokyo.
In 2021, both events were moved to the cooler northern city of Sapporo due to heat concerns.
