I am interested in this discussion and hope a bunch of people will respond. I have found that if I water in the morning ( when it's 90+ out) many of the plants are dry when I get home from work so I have to water in the evening anyway. However, I have been experimenting with watering and have figured out that if I water really well at night they make it through to the next evening, saving a watering.
I, too, have read about the fungus thing so have resisted eve. waterings. But when it's so hot and dry, even if it gets down to 50 I don't see where fungi can get a start. Now in the Willamette Valley (here in OR) where moss grows on the sides of houses

I can see a potential problem with fungi.
So please respond, people. This is a good question!