The mayor pro tem shall, during the absence or inability of the mayor to perform his duties, act in the name and stead of the mayor and shall, during the time of such absence or inability, exercise all the duties and possess all the powers of the mayor. The mayor pro tem, when acting as mayor, shall preside over the meeting and may vote on resolutions or ordinances. In the absence of the mayor pro tem, the council members present shall select an acting mayor pro tem.