The first thing is THE SEASON.
You want to sail in the 'right' season. Mind the bad storms South in the Southern winter. Mind Indian hurricanes that pass the area as post tropical storms otherwise.
Winter you are passing the ocean at lower latitudes. Summer you can sail in higher latitudes.
If you sail summer to far N, it will be a very very slow passage
. As you will get way to close to the High (-s) (which normally are two at a time). You need those lows to propel you forward. Just you do not want all the brute force of a nasty one.
Mind this is a long and difficult passage
, taking relevant skills, boat
and preparations. Southern Indian has broken many a sailor. It is NOT an easy stroll, at any time of the year.
One of my dreams, to sail from RSA to AUS too. Good luck.
I would be interested in following your preparations and voyage, if you have a blog or any other stuff like that.