Do you need to know, when is the best time to go to New Zealand? Then you should take a look here, what weather you can expect there during the year.
The climate of New Zealand is temperate, but there are sharp regional contrasts. Weather is for example very wet on the west coast of the South Island, but almost semi arid in Central Otago. And the climate is subtropical in Northland. But most regions of New Zealand have a maritime climate with four distinct seasons. 
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Abel Tasman National Park, Akaroa, Alexandra, Aoraki Mount Cook National Park, Arrowtown, Arthur's Pass National Park, Auckland, Auckland Region, Bay of Islands, Bay of Plenty, Blenheim, Blueskin Bay, Bluff, Browns Bay, Cambridge, Canterbury, Cape Brett, Cape Reinga, Carterton, Central North Island, Chatham Islands, Christchurch, Collingwood, Coromandel, Coromandel Peninsula, Cromwell, Dannevirke, Dargaville, Devonport, Diving Cuvier Island, Diving Mayor Island, Diving White Island, Diving at Three Kings Islands, Diving in New Zealand, Diving the Alderman Islands, Diving the Hen and Chicken Islands, Diving the Mercury Islands, Diving the Mokohinau Islands, Diving the Poor Knights Islands, Doubtless Bay, Dunedin, East Cape, East Coast, Elsthorpe, Fairlie, Far Far North, Feilding, Fiordland National Park, Flaxmere, Fox Glacier, Franz Josef, Gisborne, Glenorchy, Golden Bay, Gore, Great Barrier Island, Greater Christchurch, Greater Wellington, Greymouth, Haast, Hahei, Hamilton, Hanmer Springs, Hastings, Havelock, Havelock North, Hawera, Hawke's Bay, Helensville, Hokianga, Hokitika, Horeke, Hutt Valley, Invercargill, Kahurangi National Park, Kaiapoi, Kaikoura, Kaitaia, Kapiti Coast, Kerikeri, Kingston, Kohukohu, Koutu, Kuaotunu, Lake Tekapo, Leigh, Levin, Long Bay, Lower Hutt, Lower Northland, Lyttelton, Mackenzie Country, Manawatu, Mangamuka Bridge, Mapua, Marlborough, Marlborough Sounds, Martinborough, Masterton, Matamata, Mataura, Matawai, Methven, Mid and South Canterbury, Milford Sound, Milton, Morere, Motueka, Mount Aspiring National Park, Murchison, Muriwai, Napier, National Park Village, Nelson, Nelson Bays, Nelson Lakes National Park, New Plymouth, New Zealand Subantarctic Islands, Ninety Mile Beach, North Canterbury, North Island, Northland, Oamaru, Ohakune, Omarama, Onekaka, Opononi, Opotiki, Otago, Otaki, Paekakariki, Paihia, Palmerston North, Paraparaumu, Pauanui, Pelorus Bridge, Picton, Piha, Pirongia, Pleasant Point, Porirua, Port Chalmers, Puhoi, Punakaiki, Queenstown Lakes, Queenstown, Raetihi, Raglan, Rai Valley, Rangiora, Rawene, Renwick, Ross, Rotorua, Russell, Seddon, Shannon, South Island, Southern Alps, Southern Lakes, Southland, Springfield, St Arnaud, Stewart Island, Stratford, Tairua, Takaka, Takapuna, Taradale, Taranaki, Taupo, Tauranga, Te Anau, Te Kuiti, Te Puke, Thames, The Catlins, Timaru, Tiritiri Matangi Island, Tongariro National Park, Torbay, Turangi, Upper Hutt, Vinegar Hill, Waiheke Island, Waihi Beach, Waikanae, Waikato, Waima Valley, Waipara, Waipukurau, Wairarapa, Wairoa, Waitomo, Wakefield, Wanaka, Ward, Warkworth, Wellington, Wellsford, West Coast, Westland National Park, Westport, Whakatane, Whangamata, Whanganui, Whangarei, Whangaroa, White Island, Whitianga.
Let's look now what weather you can expect in the area around the capital and in many other cities. The warmest month here is January, the average maximum temperature is 21.6 ℃ (70.88 ℉). The average minimum temperature in this month is 14.8 ℃ (58.64 ℉). The coldest month here is July, the average maximum temperature is 12.7 ℃ (54.86 ℉). The average minimum temperature in this month is 7.1 ℃ (44.78 ℉). 
When travelling to some places in New Zealand, always consider the altitude of the the place as well. The highest point here is Aoraki-Mount Cook (3724 m) and the lowest point is Pacific Ocean (0 m). So there are huge differences in altitudes in this country and the weather is very different in them therefore. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in New Zealand in January is this: The average highest temperature in New Zealand in January is 21.6 ℃ (70.88 ℉). The average lowest temperature is 14.8 ℃ (58.64 ℉). At the beginning of January you can expect lower temperatures, the average highest temperature is around 20.75 ℃ (69.35 ℉). At the end of January you can expect lower temperatures, the average highest temperature is around 21.4 ℃ (70.52 ℉). The average rainfall is 57.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:06 (hours and minutes), in the middle of the month 14:48 and at the end of the month 14:19.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in February is this: The average highest temperature in New Zealand in February is 21.2 ℃ (70.16 ℉). The average lowest temperature is 15.4 ℃ (59.72 ℉). At the beginning of February you can expect higher temperatures, the average highest temperature is around 21.4 ℃ (70.52 ℉). At the end of February you can expect lower temperatures, the average highest temperature is around 20.7 ℃ (69.26 ℉). The average rainfall is 62.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:19 (hours and minutes), in the middle of the month 13:42 and at the end of the month 13:02.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in March is this: The average highest temperature in New Zealand in March is 20.2 ℃ (68.36 ℉). The average lowest temperature is 13.6 ℃ (56.48 ℉). At the beginning of March you can expect higher temperatures, the average highest temperature is around 20.7 ℃ (69.26 ℉). At the end of March you can expect lower temperatures, the average highest temperature is around 19 ℃ (66.2 ℉). The average rainfall is 68.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:02 (hours and minutes), in the middle of the month 12:20 and at the end of the month 11:39.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in April is this: The average highest temperature in New Zealand in April is 17.8 ℃ (64.04 ℉). The average lowest temperature is 11.9 ℃ (53.42 ℉). At the beginning of April you can expect higher temperatures, the average highest temperature is around 19 ℃ (66.2 ℉). At the end of April you can expect lower temperatures, the average highest temperature is around 16.4 ℃ (61.52 ℉). The average rainfall is 68.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:39 (hours and minutes), in the middle of the month 10:58 and at the end of the month 10:21.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in May is this: The average highest temperature in New Zealand in May is 15 ℃ (59 ℉). The average lowest temperature is 9.9 ℃ (49.82 ℉). At the beginning of May you can expect higher temperatures, the average highest temperature is around 16.4 ℃ (61.52 ℉). At the end of May you can expect lower temperatures, the average highest temperature is around 14 ℃ (57.2 ℉). The average rainfall is 87.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:21 (hours and minutes), in the middle of the month 9:49 and at the end of the month 9:25.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in New Zealand in June is this: The average highest temperature in New Zealand in June is 13 ℃ (55.4 ℉). The average lowest temperature is 8 ℃ (46.4 ℉). At the beginning of June you can expect higher temperatures, the average highest temperature is around 14 ℃ (57.2 ℉). At the end of June you can expect lower temperatures, the average highest temperature is around 12.85 ℃ (55.13 ℉). The average rainfall is 101.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:25 (hours and minutes), in the middle of the month 9:12 and at the end of the month 9:13.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in July is this: The average highest temperature in New Zealand in July is 12.7 ℃ (54.86 ℉). The average lowest temperature is 7.1 ℃ (44.78 ℉). At the beginning of July you can expect higher temperatures, the average highest temperature is around 12.85 ℃ (55.13 ℉). At the end of July you can expect higher temperatures, the average highest temperature is around 13 ℃ (55.4 ℉). The average rainfall is 112.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:13 (hours and minutes), in the middle of the month 9:26 and at the end of the month 9:51.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in August is this: The average highest temperature in New Zealand in August is 13.3 ℃ (55.94 ℉). The average lowest temperature is 7.6 ℃ (45.68 ℉). At the beginning of August you can expect lower temperatures, the average highest temperature is around 13 ℃ (55.4 ℉). At the end of August you can expect higher temperatures, the average highest temperature is around 14 ℃ (57.2 ℉). The average rainfall is 94 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:51 (hours and minutes), in the middle of the month 10:23 and at the end of the month 11:00.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in September is this: The average highest temperature in New Zealand in September is 14.7 ℃ (58.46 ℉). The average lowest temperature is 9.1 ℃ (48.38 ℉). At the beginning of September you can expect lower temperatures, the average highest temperature is around 14 ℃ (57.2 ℉). At the end of September you can expect higher temperatures, the average highest temperature is around 15.25 ℃ (59.45 ℉). The average rainfall is 76.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:00 (hours and minutes), in the middle of the month 11:39 and at the end of the month 12:20.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in October is this: The average highest temperature in New Zealand in October is 15.8 ℃ (60.44 ℉). The average lowest temperature is 10.1 ℃ (50.18 ℉). At the beginning of October you can expect lower temperatures, the average highest temperature is around 15.25 ℃ (59.45 ℉). At the end of October you can expect higher temperatures, the average highest temperature is around 16.85 ℃ (62.33 ℉). The average rainfall is 95.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:20 (hours and minutes), in the middle of the month 13:01 and at the end of the month 13:41.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in November is this: The average highest temperature in New Zealand in November is 17.9 ℃ (64.22 ℉). The average lowest temperature is 11.7 ℃ (53.06 ℉). At the beginning of November you can expect lower temperatures, the average highest temperature is around 16.85 ℃ (62.33 ℉). At the end of November you can expect higher temperatures, the average highest temperature is around 18.9 ℃ (66.02 ℉). The average rainfall is 74.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:41 (hours and minutes), in the middle of the month 14:18 and at the end of the month 14:47.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in New Zealand in December is this: The average highest temperature in New Zealand in December is 19.9 ℃ (67.82 ℉). The average lowest temperature is 13.4 ℃ (56.12 ℉). At the beginning of December you can expect lower temperatures, the average highest temperature is around 18.9 ℃ (66.02 ℉). At the end of December you can expect higher temperatures, the average highest temperature is around 20.75 ℃ (69.35 ℉). The average rainfall is 63.6 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:47 (hours and minutes), in the middle of the month 15:05 and at the end of the month 15:09.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.| Wellington | temperature: - | highest temperature: 19.9 ℃ (67.82 ℉) | lowest temperature: 13.4 ℃ (56.12 ℉) | rainfall: 63.6mm | rainy days: - |
| Auckland | temperature: - | highest temperature: 22.5 ℃ (72.5 ℉) | lowest temperature: 15.4 ℃ (59.72 ℉) | rainfall: 85.4mm | rainy days: - |
| Christchurch | temperature: - | highest temperature: 21.4 ℃ (70.52 ℉) | lowest temperature: 10.6 ℃ (51.08 ℉) | rainfall: 48mm | rainy days: - |
| Dunedin | temperature: - | highest temperature: 17.6 ℃ (63.68 ℉) | lowest temperature: 10.6 ℃ (51.08 ℉) | rainfall: 80.2mm | rainy days: - |
| Hamilton | temperature: - | highest temperature: 22.8 ℃ (73.04 ℉) | lowest temperature: 11.5 ℃ (52.7 ℉) | rainfall: 105.6mm | rainy days: - |
| Hokitika | temperature: - | highest temperature: 17.9 ℃ (64.22 ℉) | lowest temperature: 10.8 ℃ (51.44 ℉) | rainfall: 302.1mm | rainy days: - |
| Kaitaia | temperature: - | highest temperature: 21.8 ℃ (71.24 ℉) | lowest temperature: 14.3 ℃ (57.74 ℉) | rainfall: 116.1mm | rainy days: - |
| Napier | temperature: - | highest temperature: 23.4 ℃ (74.12 ℉) | lowest temperature: 13.1 ℃ (55.58 ℉) | rainfall: 58.4mm | rainy days: - |
| Nelson | temperature: - | highest temperature: 21.2 ℃ (70.16 ℉) | lowest temperature: 12.5 ℃ (54.5 ℉) | rainfall: 83.1mm | rainy days: - |
| New Plymouth | temperature: - | highest temperature: 20.6 ℃ (69.08 ℉) | lowest temperature: 12.3 ℃ (54.14 ℉) | rainfall: 85.5mm | rainy days: - |
| Palmerston North | temperature: - | highest temperature: 21.1 ℃ (69.98 ℉) | lowest temperature: 11.7 ℃ (53.06 ℉) | rainfall: 95.2mm | rainy days: - |
| Queenstown | temperature: - | highest temperature: 19.9 ℃ (67.82 ℉) | lowest temperature: 8.6 ℃ (47.48 ℉) | rainfall: 77.2mm | rainy days: - |
| Rotorua | temperature: - | highest temperature: 20.8 ℃ (69.44 ℉) | lowest temperature: 12 ℃ (53.6 ℉) | rainfall: 116mm | rainy days: - |
| Ashburton | temperature: - | highest temperature: 21.5 ℃ (70.7 ℉) | lowest temperature: 10.1 ℃ (50.18 ℉) | rainfall: 57.5mm | rainy days: - |
| Blenheim | temperature: - | highest temperature: 22 ℃ (71.6 ℉) | lowest temperature: 11.1 ℃ (51.98 ℉) | rainfall: 59.2mm | rainy days: - |
| Dargaville | temperature: - | highest temperature: 21.1 ℃ (69.98 ℉) | lowest temperature: 14.2 ℃ (57.56 ℉) | rainfall: 85.6mm | rainy days: - |
| Gisborne | temperature: - | highest temperature: 23.7 ℃ (74.66 ℉) | lowest temperature: 13.3 ℃ (55.94 ℉) | rainfall: 56.6mm | rainy days: - |
| Gore | temperature: - | highest temperature: 18.4 ℃ (65.12 ℉) | lowest temperature: 8.7 ℃ (47.66 ℉) | rainfall: 100.2mm | rainy days: - |
| Invercargill | temperature: - | highest temperature: 17.3 ℃ (63.14 ℉) | lowest temperature: 8.6 ℃ (47.48 ℉) | rainfall: - | rainy days: - |
| Kaikoura | temperature: - | highest temperature: 19.2 ℃ (66.56 ℉) | lowest temperature: 11.9 ℃ (53.42 ℉) | rainfall: 46.5mm | rainy days: - |
| Levin | temperature: - | highest temperature: 19.9 ℃ (67.82 ℉) | lowest temperature: 12.7 ℃ (54.86 ℉) | rainfall: 100.8mm | rainy days: - |
| Milford Sound | temperature: - | highest temperature: 18.4 ℃ (65.12 ℉) | lowest temperature: 9.7 ℃ (49.46 ℉) | rainfall: - | rainy days: - |
| Motueka | temperature: - | highest temperature: 21.8 ℃ (71.24 ℉) | lowest temperature: 11.1 ℃ (51.98 ℉) | rainfall: 102.3mm | rainy days: - |
| Mount Cook | temperature: - | highest temperature: 18.2 ℃ (64.76 ℉) | lowest temperature: 7.3 ℃ (45.14 ℉) | rainfall: 504.7mm | rainy days: - |
| Oamaru | temperature: - | highest temperature: 18.1 ℃ (64.58 ℉) | lowest temperature: 10.1 ℃ (50.18 ℉) | rainfall: - | rainy days: - |
| Paraparaumu | temperature: - | highest temperature: 19.2 ℃ (66.56 ℉) | lowest temperature: 12.9 ℃ (55.22 ℉) | rainfall: 84.1mm | rainy days: - |
| Reefton | temperature: - | highest temperature: 21.3 ℃ (70.34 ℉) | lowest temperature: 10 ℃ (50 ℉) | rainfall: 192.2mm | rainy days: - |
| Taumarunui | temperature: - | highest temperature: 21.9 ℃ (71.42 ℉) | lowest temperature: 11.6 ℃ (52.88 ℉) | rainfall: 139.1mm | rainy days: - |
| Taupo | temperature: - | highest temperature: 21.1 ℃ (69.98 ℉) | lowest temperature: 10.4 ℃ (50.72 ℉) | rainfall: 93.2mm | rainy days: - |
| Tauranga | temperature: - | highest temperature: 22.1 ℃ (71.78 ℉) | lowest temperature: 14.3 ℃ (57.74 ℉) | rainfall: 93.8mm | rainy days: - |
| Te Kuiti | temperature: - | highest temperature: 22 ℃ (71.6 ℉) | lowest temperature: 12 ℃ (53.6 ℉) | rainfall: 139.8mm | rainy days: - |
| Thames | temperature: - | highest temperature: 22.7 ℃ (72.86 ℉) | lowest temperature: 13.6 ℃ (56.48 ℉) | rainfall: 80.7mm | rainy days: - |
| Timaru | temperature: - | highest temperature: 19.9 ℃ (67.82 ℉) | lowest temperature: 9.2 ℃ (48.56 ℉) | rainfall: 53.6mm | rainy days: - |
| Wanaka | temperature: - | highest temperature: 22 ℃ (71.6 ℉) | lowest temperature: 9.4 ℃ (48.92 ℉) | rainfall: 66.8mm | rainy days: - |
| Westport | temperature: - | highest temperature: 18.4 ℃ (65.12 ℉) | lowest temperature: 12 ℃ (53.6 ℉) | rainfall: 189.9mm | rainy days: - |
| Whakatane | temperature: - | highest temperature: 22.3 ℃ (72.14 ℉) | lowest temperature: 13.2 ℃ (55.76 ℉) | rainfall: 94.5mm | rainy days: - |
| Whanganui | temperature: - | highest temperature: 20.6 ℃ (69.08 ℉) | lowest temperature: 12.9 ℃ (55.22 ℉) | rainfall: 93.2mm | rainy days: - |
| Whangarei | temperature: - | highest temperature: 22.8 ℃ (73.04 ℉) | lowest temperature: 14.6 ℃ (58.28 ℉) | rainfall: 98mm | rainy days: - |
| Whitianga | temperature: - | highest temperature: 22.8 ℃ (73.04 ℉) | lowest temperature: 13.3 ℃ (55.94 ℉) | rainfall: 129.4mm | rainy days: - |