Final Preparations are underway ahead of Taylor Swift’s four-show run in the Harbour City.

Thousands of fans have lined up for over two hours to spend big on Taylor Swift merchandise ahead of the start of her sold out Sydney shows tomorrow.

It could be a wet affair for the 80-thousand fans as the Bureau has warned of potential thunderstorms following a hot day around Sydney.

Police are also warning those who missed out on tickets to stay away from the precinct to ensure crowd safety.

300-thousand people are expected to head to Olympic Park over the next four days prompting transport officials to provide an extra 550 train and 700 bus services to meet demand.