As I said earlier, preferred watering times will vary by region. And in truth, it often ends up not being so crucial. Damp foliage is just on element to consider for whether a fungal disease will progress or not. After all, it does rain at night,
and almost all the moisture put in the ground the night before will still be there for the plants in the morning.
Where I live there is no summer rainfall and evening irrigation is quite common. Nobody would complain or worry about it raining at night, just as long as it rains sometime. In January, we resemble Portland, in July you would think you were in Phoenix.
So hot and dry can mean different things to different people. I consider eastern Texas to be hot and humid.
Regarding precipitation, parts of eastern Texas may be somewhat dry, at least in a dry year, but usually there is rainfall throughout the year, and it is almost always humid in the warm season.
Of course, all things are relative. I really don't want to start an argument about how hot is hot and how dry is dry.