Definitely more likely a drainage problem.
Yes, sometimes in summer you might have a shrub that could benefit from the cooling that a light misting of the leaf surfaces can offer, but at night that would be irrelevant.
Check the planting depth, correct if needed, improve the drainage there, and implement the sick tree treatment. That's your best bet.
_________________ Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.
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