don't worry,it is summer there in New Zealand.

Yes .In march new Zealand weather is not cold .don't worry and go to your trip and enjoy.

Best of luck.

hey i would add u can have a great traveling in these months as March to May are New Zealand's autumn months. While temperatures are a little cooler than summer, the weather can be excellent, and it is possible to swim in some locations until the end of April. While New Zealand's native fauna is evergreen, there are many introduced deciduous trees. Colourful changing leaves make autumn a scenic delight, especially in regions such as Central Otago and Hawke's Bay, which are known for their autumn splendour.
hope u have a great trip..
thanks....

New Zealand is beautiful place to visit year round,no matter what time of the year you visit..March-April you will experience very pleasant climate ,during which leaves on the trees turn to the classic red, yellow and brown color of Autumn...Every where you will get to see Beautiful scenery ...