The amount of sunlight your plants are exposed to has a large impact on the water needs of the plants. Be careful to not underestimate the amount of sun exposure as this might cause damage to your plants.
To estimate the amount of sun exposure in this zone begin when the sun has first fully risen. Write down the time and if the zone is in sun or shade. Check back every hour or two, write down the time and if the zone remains in sun or shade. At the end of the day, you should have a good idea of how much the zone is exposed to the sun.
Surfaces that are exposed to direct sunlight such as walls, buildings, and vinyl fences, may be radiating heat onto the plants and increasing the effective amount of sun exposure for this zone.