Abstract: A stable portable handrail system able to withstand significant weight and stress through sound securement of surface-engaging components thereof. The system first includes a plurality of spaced-apart vertical members each having at a base a pivoting vacuum cup assembly for vacuum engagement with a substantially horizontal surface upon which the handrail system is to be accommodated. At least one horizontal member is connected to each vertical member, and at least one brace member extends in outrigger fashion to the horizontal surface at an angle with respect to the vertical members. The base of the brace member likewise is a pivoting vacuum cup assembly for vacuum engagement with the horizontal surface. Preferably, all vacuum cup assemblies include respective valves for external application of a vacuum source for stable system vacuum securement throughout the term of use of the handrail system.