Warmer than New Zealand! I would go with a thin, lighter weight batting. A day or so ago there was another thread on this board about batting and in it there was a chart comparing different battings (silk, bamboo, cotton, polyester, wool, etc.) with their warmth rating and other characteristics that would be of help to you, so scroll back in the Main board category a few days and review this info. I've been to both Australia and New Zealand and you live in a beautiful part of the world!!!