Extreme temperature does not complement plants well. In particular, intense sun and high temperatures can cause a handful of disorders in plants.
Sunscald is when the sun shines directly on plants for a prolonged period, causing tissue temperatures to rise, or too much water is lost from the plant before its replaced. Sunscald is a disorder which affects thin-barked trees such as beech, cherries, maples or poplars. Fruits can also be affected by similar causes; tomatoes, gooseberries, apples and pears are some of the first affected fruits.
Greenback can arise when the fruit of trees are exposed to strong sunlight, resulting in brown burnt parches on the crop.
In addition, high temperatures can cause heat canker in woody plants, and a similar disorder called 'strangles' in root veg and other leafy plants.