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.
Well, of course, none of these climate problems will surface in the upcoming World Cup 2022 as long as they will not wait until winter to play the games just kidding.
I mean, North American countries have been known to have their own nice weathers especially in Summer where most games of World Cup usually happens and cooling system inside stadiums will not be needed anymore because even if it's summer time, the weather is still friendly enough for tourists, players, audience and the organizers to enjoy the games.