Traders are cautious of the Reserve Bank in case it gives a more hawkish account in next week's interest rate review, where governor Graeme Wheeler is expected to raise the official cash rate a quarter point to 3.5 percent.
"They're wary of selling something with a positive carry" ahead of the RBNZ's July 24 statement, Tuck said. Once that is out of the way there was a prospect that the kiwi could weaken in line with commodity prices.
AMP Capital New Zealand, which manages more than $18 billion of assets, said yesterday it was underweight the New Zealand dollar even while holding more cash than the size of its portfolios would suggest.
Adding to the mix of forces driving world markets, the Philadelphia Federal Reserve's Business Outlook Survey, a measure of regional manufacturing activity in the US, rose to the highest level in more than three years, surprising economists, while weekly initial jobless claims came in lower than expected.
James Bullard, president of the St. Louis Federal Reserve said the Fed may have to raise interest rates more quickly "if macroeconomic conditions continue to improve at the current pace."
The kiwi fell to 64.04 euro cents from 64.25 cents yesterday and dropped to 87.68 yen from 88.20 yen. It traded at 50.68 British pence from 50.70 pence and decreased to 92.65 Australian cents from 92.78 cents.