An illuminated mobile sign system including a sign assembly, a charging assembly, and at least one suction-cup. The sign assembly includes a luminous-fiber-optic-fabric, and a rigid-backboard in structural and functional combination. The rigid-backboard of the sign assembly includes a front-side, a back-side, and a periphery. The charging assembly includes, and is defined by, a thin-cell-rechargeable-battery, one or more photovoltaic-cells, a male-power-connector, a female-power-connector, and a battery-connector. The rigid-backboard includes a front-side, a back-side, and a periphery. The periphery exhibits a badge-shape to provide a more formal aesthetic design. Illuminated mobile sign system is weather-resistant. The illuminated mobile sign system is structured and arranged to allow a user to display an illuminated image or illuminated-message upon a surface via the sign assembly. The illuminated image includes alphanumeric text, as well as graphics.