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What you might see
Browning of leaves in centers or on edges - sunburn. Looks bad but won't kill the plant.
Tomato or squash flowers dropping off - they just can't take the heat. There will be more flowers when temperatures fall.
Wilting - many plants wilt to get leaves out of the hot sun. As temperatures drop in the evening, leaves pop up again.
Grass burns around edge of lawn - concrete reflects the heat onto the grass. To maintain a green lawn water once a week - 1" of water. A few mowings will remove damaged grass.
What you can do now
-- Water in the morning to get plants hydrated for the day.
-- Spray leaves in the afternoon to cool them off.
-- Shade newly planted shrubs and flowers with a box or fabric in the hottest part of the day, but don't over water - they have a small root systems.
-- Mulch around trees and shrubs to reduce evaporation and cool soil.