What good is it heading off for a dive to find a roaring southerly that rules out your favourite site, or a cold current has dropped the water temperature to 15 degrees Celsius and you only brought your 3 mm wetsuit. Check out the weather and water temperatures before you leave home.
Plan your time away by following the weather pattern prior to leaving home.
Bureau of Meteorology site is a great site for all weather around Australia. www.bom.gov.au
Manly Hydro Lab. will tell you most things you want to know about sea conditions including the water temperature.