The New Zealand dollar rose against all other currencies amid growing optimism the United States and China will settle their trade differences.
The kiwi was trading at 68.83 US cents at 5pm in Wellington from 68.58 at 8am. The trade-weighted index was at 74.59 from 74.43.
"The risk-positive sentiment from Friday night extended into the Asian session today," Westpac market strategist Imre Speizer said.
In the early part of the day, the currency moved little and the rally didn't get underway until Asian markets opened for the week, Speizer said.
Asian investors were more willing to buy risk-sensitive assets and both the kiwi and Australian dollars benefited from the improved sentiment, he said.