right now the heat is much stronger than in june. last two yrs, i left my cuttings in 1 gal without water for a week due to BSA summer camp. by the time i come back, they all look like they will need water. looks wilted and some down right dried up. but after good watering, they all come back.
here is one thing i noticed. the trees in shade needs little less water than the ones on the full sun. if the trees are young and tender, leave them in shade while you are gone, after good watering. bigger trees, i have them on drip system so they stay out in full sun.