Yeah, every host city for the World Cup is in the south hemisphere, so everywhere teams go to is winter! However, it is not even the heat that bothers, it is the stupid high humitidy in the Northeast (Fortaleza, Recife and Salvador) that will fuck with the players. It prevents you from sweating, which prevents you from coolin down, meaning you will get tired a lot faster and you will need to constantly drink water! I get what you were saying and you are right, but it is still winter and it is more the humidity than the heat itself!