A dishwasher appliance includes a cabinet defining a wash chamber for receipt of articles for washing. The dishwasher appliance also includes a spray arm disposed within the wash chamber and rotatable about an axis. In addition, the spray arm defines an interior and aperture providing selective fluid communication between the interior and the wash chamber. The dishwasher appliance also includes a valve positioned within the interior of the spray arm, and the valve is stationary relative to the spray arm. The spray arm is rotatable between a first position and a second position. In the first position, the valve allows fluid communication between the interior and the wash chamber through the aperture. In contrast, when the spray arm is in the second position, the valve obstructs fluid communication between the interior and the wash chamber through the aperture.