This year, summer lasts until April as above normal temperatures predicted

Ava Barrington-Tulaga in the splash pool at Auckland's Wynyard Quarter during the city's anniversary weekend. The soaring temperatures are set to continue. Photo / Jason Dorday

If you're struggling to adapt to this month's warmer than normal temperatures, get used to it: the balmy weather is set to roll on beyond the end of summer.

A climate outlook released by the National Institute of Water and Atmosphere (Niwa) this afternoon said temperatures would most likely be in the "above normal" range for all regions of the country until April.

The dry conditions continued as sea surface temperatures across the equatorial Pacific Ocean were borderline between neutral and weak El Nino conditions.

"However - as was the case over the past few months - the atmospheric circulation in the Pacifc is still inconsistent with El Nino," the report said.

International guidance indicated that the probability of El Nino conditions developing over the next three months was about 60 per cent.

Over that period, higher pressures than normal were forecast over and to the southeast of the country, and slightly lower than normal pressures were likely to the north of New Zealand.

"This atmospheric pressure pattern is expected to be associated with weak easterly flow anomalies."

Sea surface temperatures around New Zealand were forecast to be in the above normal range all around the country.

New Zealand had a "slightly elevated chance" of having an ex-tropical system coming within 550km of the country during this tropical cyclone season, with the risk highest between February and April.

In Northland, Auckland, Waikato and Bay of Plenty, temperatures were most likely to be above average, with rainfall in the near normal range, and soil moisture and river flow levels equally likely to be in the near or below normal.

Nationally, rainfall would be near normal in the north of the North Island and the north and west of the South Island, while rainfall totals for the season as a whole were equally likely to be in the near-normal or below normal in the east of the South Island.

In the east and west of the North Island, the coming season's rainfall was about equally likely to be near or above normal, Niwa said.

Soil moisture levels would most likely be below normal in the east of the South Island and about equally likely to be near-normal or below normal in all regions of the North Island and the west of the South Island.

River flows were most likely to be below normal in the east of the South Island and about equally likely to be near or below normal in the north and west of the North Island and the west of the South Island.

Near normal river flows were likely in the east of the North Island and the north of the South Island.

WeatherWatch forecaster Phillip Duncan said the tropics and Southern Ocean appeared to be "firing up ... but we need a break in the highs coming from south of Australia before we can get a wet day".

"Our best bet is for another Tasman Sea low later in February - or a sub-tropical low. Neither are in the long range forecasts at this stage."

By the end of next week, windier westerlies could be expected to return with hot weather in the east and slightly cloudier weather in the west, he said.

"February looks hot and dry for the areas that are driest and hottest. But that's to be expected in our hottest, driest, month of the year."