The Aussie dropped as much as 0.51% to $0.6669, the lowest since Sept. 12, before changing hands down 0.38% at $0.6678 as of 0133 GMT.
The New Zealand dollar sank as much as 0.69% to $0.6041, a level last seen on Aug. 19.
China will hold a press conference on Thursday to discuss promoting the "steady and healthy" development of the property sector.
The dollar was little changed at 149.135 yen , not far from Monday's high of 149.98 yen, the strongest since Aug. 1.
The euro edged 0.05% lower to $1.08875, and earlier touched $1.0882, matching the low from Tuesday, which was the weakest level since Aug. 8.
Persons:
There's, Ray Attrill, there's, Attrill
Organizations:
New Zealand, National Australia Bank, Statistics, U.S, Traders, Fed, European Central Bank
Locations:
New Zealand, Beijing, China, Statistics New Zealand