Actually African teams have decent chance if they get their harder games in Manaus or Fortaleza. It's 32-34 degrees average, with a humidity beyond reasonable. It's unbearable to play football in since the shirts, shorts, socks all get soaked after 5 minutes.
Compare that to say Berlin where weather in June is 22 degrees in june or say Porto Alegre where some games will be played and the temperature is aorund 19-20 degrees in average.
Such a big country that I think temperature and weather will play a big role.