High temperatures may affect your orchard, even if its effects on the trees are not as dangerous as frost, or low temperatures in general. Each fruit species has its own needs to be able to cope with the hot temperatures and respecting these following rules can save your orchard.
Water especially young trees, which have short roots and quickly run out of water resources
Water the fruit trees early in the morning, before the sun shows up in the sky. The amount of water you pour at the roots helps the plants cope with the stress of the day, when the temperatures become unbearable. Evening watering is good too, but it should be done after the sunset. The plants must never be watered during the day, because the big difference in temperature and the water vapor that will rise from the soil will negatively affect the plants, which can lead even to their death.
Do not water the trees, but the soil! Even if your intention is to revive them, the effect will be exactly the opposite. The dry air and the strong UV rays will affect the leaves and the plant may wither. Apply fertilizing products from https://www.revive.com/ and water the soil to nourish your trees.