An outdoor sign assembly includes a perimeter framework with fluid-directing channels to direct water off of the sign during inclement weather, and further includes individually removable sign face panels that are configured to support individual indicia members including lettering, numbers, symbols, designs, or the like, including internally-lighted indicia. The sign face panels cooperate with the framework to direct water around and off of the sign assembly, and may be placed in side-by-side arrangement to achieve any desired length. During assembly or disassembly, the sign face panels are held relatively securely to the framework, even before mechanical fasteners are fully tightened.