A weather shield device for a medical stretcher includes a generally square-shaped malleable main body member that is constructed from one or more layers of waterproof fabric. An elongated hollow channel is positioned along the periphery of the main body for receiving and housing a self-supporting frame. The frame and main body are transitioned between a folded position, a fully open position and an arched position for use with a stretcher. A plurality of connectors are disposed along the sides of the main body and function to selectively engage the sides of a medical stretcher. When secured onto the stretcher, the frame forms an arched shape so as to fully cover the stretcher with the waterproof main body, and a pair of semi-rigid struts maintain a set separation distance between the sides of the main body when in the arched position.