Working in the garden at around 4:00 in the afternoon in the middle of July isn't what most people have in mind. It's hot and we're all too used to our air conditioners blasting 60 degree air at us. If however that is the only time of day you have for gardening, you either suck it up or you don't garden. If you do garden, one of the best things to have on hand is a nice cold glass of ice water.
I say,"Don't be stingy!" Your plants want some too. I know, don't water between bla bla bla.... But who says they want the water. What they really want is a bug hunk of ICE. That's right, they wish it was in the 60's too. No room temperature water for them, and the boiling stuff that comes out of the hose is murder. You might as well uproot them and bake them in a oven.
To get the best results, use a block of ice not crushed or cubed. The block will stay cold longer and keep the ground moist and cool for the thirsty plants for at least an hour. Combine this with mulch and your plants will love you.