South East Australia is quite unreliable on paddling flows by world standards. However there is some good paddling to be had especially in the "creek" category. Big rivers probably justifies a spring trip to New Zealand to sample the joys of the Buller and similar south Island rivers.
To be a little more quantitative about what is forecast in the coming 6 months - have a squizz at
http://www.bom.gov.au/water/ssf/ This tool draws upon several medium term climate trends that affect Australia's rainfall and stream flow. The tool has a lot of good science behind it and could even influence decisions around travel within Aust and New Zealand.
One other observation - if you are into warm water paddling then consider a trip to North Queensland (Tully, Johnston, Herbert - flying in to Cairn or Townsville) - the paddling is good,the weather is better and cheap air tickets can be found out of Canberra. Autumn, winter and spring usually have good paddling there.
Bok (give us a call when you get into Canberra 0407 228192)