Qatar is a country with this hot weather and that's why they had cooling devices even in stadiums otherwise considering the number of fans in stadiums it could be so hard for the visitors to even stay in the stadiums that's why as far as I know most of the games was at night and the world cup was in winter to make sure about the weather but we won't have these problems in America and especially in Canada in 2026.
The next FIFA World Cup will be held from June-July 2026. And the day-time temperature in Southern cities such as Los Angeles can climb to 30-32 degrees during this time. It may not be as hot as the Arabian peninsula, but many of the European and East Asian teams will be at a disadvantage. Anyway, this is not new. Back in 2014, the world cup was held in Brazil, and many of the host cities were quite hot and humid. My only concern is about the rains. If there is no rain interruption, then I am OK with whatever timeline they decide.