Expect a northeasterly airflow over the country on Sunday, which will be freshening for the upper North Island, says a WeatherWatch spokesperson.

"A high lies to our southeast and a big low to the northwest."

The upper North Island is mostly cloudy today with showers expected to pushing down from the north.

"Rain moves into Northland in the afternoon, reaching Auckland around midnight. The east coast has some light drizzle, out west expect sun and high cloud," says a WeatherWatch spokesperson.

"The South Island has some cloud in the east, especially Canterbury with a few drizzle patches along the coastal fringe. Nelson and Marlborough have some sun but expect high cloud too.

"Southland and Central Otago has mostly sunny weather. The West Coast should be mostly sunny apart from a few showers for Fiordland, some high cloud in the north."

The inner South Island and areas about the Central Plateau are expected to have a frosty start to the day..

WeatherWatch is forecasting heavy rain for the upper North Island on Monday.

"A front pushing down from the northwest over the upper North Island on Monday brings some heavy rain, starting out for Northland in the morning, reaching Auckland in the afternoon then Waikato and Bay of Plenty in the evening," says a WeatherWatch spokesperson.

"Expect strong east to northeasterly winds for the upper North Island on Monday also."

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