An umbrella base for supporting an umbrella within a pool, poolside, or other outdoor areas. The umbrella base apparatus includes a base assembly having a base tube that can removably receive the umbrella therein. The base assembly includes a plate that can rest on a flat surface, one or more support arms extending from a central area outward from the plate, and a collar that is generally positioned at the central area of the plate. Each support arm interlocks with the collar. One or more weighted housings engage with a support arm and collar for providing mass to the umbrella base apparatus during use. The weighted housings are removable during transport or during submerged use. The plate and support arms have apertures that allow water to pass through during movement through water.