The 30m spire, which will also serve as an information point, aims to be a focal point for the town centre.
The 'Silica' piece will be encased with blown glass prisms, which will reflect light in the day and by night will be transformed into colour. It will be constructed from reconstituted stone and glass.
Alan Hockridge, leader of North Somerset council and chairman of the judging panel, said he was delighted with the chosen scheme.
'We were unanimous in our choice of the 'Silica' design,' he said. 'It will provide a significant meeting point and focus for residents and visitors of Weston-super-Mare.
'It will become a hub for information, orientation and transport, as well as providing a beacon of light, heralding a new vision for the town,' he added.