The New Zealand dollar weakened against its US counterpart amid speculation growth in the world's largest economy may spur the Federal Reserve to reduce stimulus, known as quantitative easing.
The kiwi fell to 81.56 US cents from 81.82 cents at 5pm yesterday. The trade-weighted index was little changed at 77.15 from 77.10 yesterday.
Investors are looking to Federal Reserve Chairman Ben Bernanke's testimony in front of a House of Representatives committee on Wednesday (Thursday NZ) in Washington where he is expected to talk about the future of the quantitative easing programme. He may be more cautious about tapering off the programme than other Fed officials, damping suggestions the Fed would start rolling back the easing programme this year.
"He will probably stay the QE course," said Mike Jones, a currency strategist at Bank of New Zealand. "He will reiterate the fact that QE is unlikely to end any time soon and could be adjusted up or down. It could temper enthusiasm for the US dollar."
The New Zealand dollar is likely today to stay within its overnight range of 81.20 US cents to 82 US cents, Jones said.