"As we move through January those kinds of pressure points will probably come to the fore - that's something that's been weighing on the Aussie and to a lesser extent the New Zealand dollar," said Robert Rennie, chief currency strategist at Westpac Banking Corp in Sydney.
"I tend to expect to a bit of strength in the New Zealand and Aussie dollars into this weekend and next week as market books a bit of profit."
Rennie expects the kiwi dollar could rise as high as 70 US cents over the next week, while the Australian dollar may rise to 73 cents, due to strong commodity prices.
The kiwi dipped briefly after a 5.5 magnitude earthquake struck near Seddon in the upper South Island and was followed soon after by a 4.7 magnitude aftershock. New Zealand's two-year swap rate was unchanged at 2.5 percent, and 10-year swaps at 3.58 percent.
Westpac's Rennie said bond yields have softened from the "extreme levels" of mid-December, as investors book profits, but also as bond markets reach an attractive level for investors and take "a wee bit of bid tone out of the US dollar".
The local currency rose to 4.8180 Chinese yuan from 4.8087 yuan yesterday after the People's Bank of China was forced to scotch reports the currency crossed the 7 yuan per US dollar level, seen as a psychological barrier.
The prospect of a weaker Chinese economy had been weighing more heavily on Australian dollar in recent days than the kiwi, with New Zealand's currency trading at 96.16 Australian cents from 96 cents yesterday.
The kiwi increased to 66.33 euro cents from 66.04 cents yesterday and gained to 56.55 British pence from 56.26 pence. It fell to 80.87 yen from 81.31 yen.