Best time of the year May to August especially living on the coast.
Growing up I remember winters on the highveld, your bones thaw out around 10 am and the cool sweeps in again around 3 pm.
Frost on the lawn some mornings looked like snow, except when it was a black frost killing just about everything in the garden.
When you are on the east coast, Id say. I am not a fan of cape winter rain. Frost is a killer to plants hey. I remember it being colder when I was little, now, not so much. I love the dry grass, it looks like real Africa.