July is after the NBA and NHL finals. It is before the NFL preseason. MLB is at the midpoint of their long season when it is late enough that the excitement of the new year has warn off and it is too early for the playoff race to reinvigorate fans. July is generally the slowest sports month in the US.
Meanwhile in October, the NBA and NHL both start their seasons. The NFL and college football are both going strong. MLB is in the middle of their playoffs. It is one of the busier sports months.
This is also just the sports calendar. Other aspects like the school schedule and traditional TV calendars also point to July as an ideal month.
Not only are Olympics no longer the festival of human achievement but lets have commercial interest dictate when they should take place, even if it makes no sense for the host country. Perfect.
(Anyone who visited Japan at that time of year will tell you the weatjer is pretty brutal, with very high temperateure and high 90%+ humidity.)
Why the negativity? Would you prefer to ignore entertainment context and only think of the weather in the host country?
Commercial interest has a direct correlation to the number of people who tune in. Even if money wasn't a factor, the number of people watching should be a core metric.
