A window deflector assembly which can be installed within a window channel of a window frame of a vehicle. The window deflector assembly can include a window deflector and a mounting clip. The mounting clip can provide greater securement to the window deflector by securing to both sides of a window channel and can include structure which can grip a portion of the window deflector on both sides. The mounting clip can be curved to aid installation of the clip into the window channel and to better distribute the load from the window deflector to sides of the window channel.