New Zealand has a subtropical temperature in the north and a temperate one in the south. The warmest months are December, January and February with an average temperature between 9° C and 26° C (48° F and 79° F). Winter temperatures in June, July and August can vary between 0° C and 18° C (32° F to 65° F).
However, the weather in New Zealand can change quickly due to cold fronts or tropical cyclones blowing in. Therefore, you should be well prepared and wear a warm and windproof jacket.