It would effect south facing beaches coming from that direction. It is a yearly part of the weather pattern. During late spring and summer, storms that originate in the Southern Hemisphere create swells that travel north and hit southern facing beaches. Same occurs in our winter when the North and North/west swells from storms hit our north and west facing beaches.
Depending on size of storms, which create the swells and some other ocean stuff determines the size of the swells. Now depending on depth of the ocean floor heading to the beach and tide can make the swells increase in size to give you bigger waves. That is why some surf break/beaches from the same swells can have LARGER waves.
Hope this helps. Old surfer am I!
