The kiwi and Aussie are also weaker as investors speculate that a slump in commodity prices, low inflation and a round of interest rate cuts by other central banks signal weak global demand, which could prompt the Reserve Banks of Australia and New Zealand to reduce interest rates.
New Zealand's central bank is expected to keep its benchmark rate at 3.5 percent when it announces its decision on Thursday, although some economists expect the bank to remove its tightening bias.
The BNZ expects the central bank to retain the bias but soften its language, which could push the kiwi back up to 75.50 US cents, Shareef said.
"We are wary that RBNZ rate cut expectations have built up quickly over the past month, and are at risk of being pulled back on Thursday," he said. "This would see the New Zealand dollar rebound modestly."
In New Zealand today, the BNZ-BusinessNZ Performance of Services Index is scheduled for release at 10:30am. Markets in Australia are closed for the Australia Day public holiday and Auckland banks are also closed for the city's anniversary holiday.
Elsewhere, the Bank of Japan publishes the minutes from its last meeting and Germany releases a business confidence survey.
This week, investors will be focused on Wednesday's Federal Reserve meeting for signs that US policymakers might waver on their course to higher interest rates. US fourth quarter gross domestic product data will also be watched following a strong third quarter.
The New Zealand dollar advanced to 94.37 Australian cents from 93.57 cents on Friday as weaker commodity prices weighed more heavily on the Aussie.
The kiwi advanced to 66.57 euro cents from 66.07 cents on Friday and slipped to 49.58 British pence from 50.02 pence.
The local currency touched a two-month low of 87.27 yen and was trading at 87.45 yen at 8am from 88.89 yen on Friday.