More than 1,200 people signed a campaign for its future after it was forced shut in London Road because the building which it was in was going to be demolished.
Formerly inside the Co-Op, the Post Office closed on December 31 last year to make way for research and office space.
The new Post Office will reopen at number 12 Windmill Road on September 15 at 1pm.
The opening hours will be Monday to Saturday, 9am to 5.30pm, providing over 51 hours of service per week.
A similar wide range of products and services will still be available.
Post Office spokeswoman Sheila Tapster said: “The new branch will be located approximately 280 metres from the previous location.
“St Leonards Road Car Park pay & display is available 120 meters away on St Leonards Road.
“The new premises will have a wide door and a ramp at the entrance. Internally, there will be a hearing loop and space for a wheelchair.
“This re-opening of the branch in a new location is a commercial decision for Post Office and we are not seeking feedback on this aspect of the change.
“However, we would welcome suggestions and feedback about access into and inside the new premises.”
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