Whatever will be will be, it no doesn't matter if there will be a climate issues or not, people will still go about their daily lives and do what they are meant to do, you guys should not worry about anything, as everything will be fine and good and the World Cup tournaments will soon take place and it will a very interesting and unforgettable one, as everyone will enjoy and have fun. So, everyone should just live right, do what they can and have the best moment of their time, as its good and helpful to their health.
The strongest El Nino on record is starting to affect weather during the World Cup. The people who are used to heat that is lethal to me may have a good time at the start, but soon it will be hard to tolerate. The true diehards will wait until their clothes catch on fire. :/
Even if you are used to the heat, stay away from crowds.