It's looking to be a hotter than usual summer, with above average temperatures very likely across the country.
Niwa says the nights will be warm and there's likely to be extended periods of high humidity.
In Tāmaki Makaurau, Central North Island, Taranaki, Whanganui, Manawatū and Wellington NIWA says there's a 70 per cent chance temperatures will be above average.
Hot, sticky nights are on the cards because there will be warmer than average coastal sea temperatures.
Summer climate outlook!— NIWA Weather (@NiwaWeather) December 1, 2021
Warmer than average temps favoured countrywide
High humidity likely
Extended dry spells possible: lower North Island, South Island
Marine heatwave conditions can add fuel to approaching lows, especially laterhttps://t.co/CoSmcHmzMh pic.twitter.com/LXbgAZbqxc
For Gisborne, Hawke's Bay and Wairarapa the likelihood is 65 per cent. There's a chance Gisborne and northern Hawke's Bay will see periodic heavy rainfall too.
Soil moisture levels in the three regions are most likely to be below normal while river flows are about equally likely to be near normal or below normal.
Wairarapa was experiencing unusually dry conditions at the end of November, NIWA said, as was mid-Canterbury and Banks Peninsula.
Tasman, Nelson, Marlborough, Buller, Coastal Canterbury and east Otago also have a 70 per cent chance of seeing higher summer temperatures.
For West Coast, Alps and foothills, inland Otago and Southland the likelihood increases to 75 per cent.
Temperatures recorded at airports in Whangārei, Auckland, Hamilton, Tauranga and Taupō broke average monthly temperatures for November.