 On a hot summer day, a southerly buster may at times moderate the extreme heat experienced in the coastal New South Wales region, from Port Macquarie southwards to Nowra.The warmest region is the north-west, where summers are very hot, and winters cooler and drier.The weather in the northeast region of the state, or the North Coast, bordering Queensland, is hot and humid in the summer, with a rainfall peak, and mild in winter with more sunshine, and little seasonal temperature difference.