New Zealand's benchmark S&P/NZX 50 index ended 0.7 percent or 58.36 points lower at 8,311.42 in its worst session since January 11.
The index however ended higher for a tenth week in eleven, up 0.3 percent.
"I think Australia being closed is one of the factors behind the drop-off in volume in our market, as obviously there is a relatively high proportion of Australian situations involved and they wouldn't be able to spell in today, presumably," said James Smalley, senior investment adviser at Hamilton Hindin Greene.
"We've also got reporting season coming up, investors are just sitting on the sidelines waiting for news companies or waiting to see how these reports start rolling out and what could happen."
Dairy firm a2 Milk Company Ltd was the biggest drag on the index, easing from recent record highs with a 2.2 percent drop.
Ryman Healthcare Ltd fell 2.3 percent, while Fisher & Paykel Healthcare Corporation Ltd slid 1.5 percent to its weakest since November 24.