Our sun gets brutal here in central South Carolina. Even when growing in the ground, the berry plants will wilt down in the hot afternoon sun, and in our sandy soil will show signs of stress. In containers the situation is much worse, and keeping the plants watered adequately is difficult. In warmer weather, my plants are always moved to the east side of a large oak tree where they only get morning sun. Those plants do much better than when left in the full sun all day. You may experiment in your area, but if the plants start wilting or showing signs of stress and you have a hard time keeping up with watering, move the plants out of the harsher afternoon sun.