But foggy and icy weather conditions are prevailing along the Table Bay shoreline, ahead of the trip later on Saturday.
A South African Navy Vessel on Saturday morning set sail from Table Bay harbour to lend support to Silver-Vallance.
The SAS Mhloti, a mine hunter, with journalists on board, will later capture Silver Vallance's take-off and follow his trajectory from the Island to Blouberg.
The even is being tweeted from Silver-Vallance's account, @balloonbloke.
South Africa-born Silver-Vallance is trying to raise money for the building of the Nelson Mandela children's hospital. He will use 200 helium filled balloons to try and pull off his mission.
On one of his latest Twitter posts, Silver- Valance says: "Inflation team hard at work, filling 200 balloons with helium. These ain't your Spur balloons, kids."
A team of 25 people started the inflation process at 3am on Saturday morning.
The balloons are 15m in diameter, which organisers say is 12 storeys high. Silver-Vallance's flying time from the island to the mainland shore at Bloubergstrand is expected to be somewhere between 45 minutes and an hour.
It is believed several of his balloons have already burst, but organisers still think the daring mission will go ahead. – Sapa