When is it to hot to cut the grass?

Another solution.

Having moved from South Jersey to The Phoenix suburbs a bit less than 2 years ago, I can tell you that it is not fun to cut the grass in the dead of summer in either of those states. That said, the same rules apply. Do it as early in the morning as possible, or when the sun is setting here in AZ. In New Jersey, the mosquitos come out at sunset, so it isn't possible.
I was lucky to get a house that only has what we call a "putting green" of grass in the back, and decorative gravel everywhere else. That is the best way to avoid cutting grass.

Never.