"More settled weather is expected tomorrow as a ridge builds over the country from the west and showers become few and far between," said MetService meteorologist Andy Best.
"On Wednesday, that ridge is expected to drift north over the North Island bringing fine weather to most places after a cool start."
This means frosts are likely over the central North Island.
Auckland is on track to beat its record of most rainy days, which currently stands at 27, if rain continues through to Wednesday.
Ahead of the front on Wednesday, it's going to be windy as northwesterlies spread up the South Island - moving through Otago by midday - and followed by cool southwesterlies.
A broad ridge of high pressure will ensure much of New Zealand will end the week with mostly fine conditions, Best said.
Philip Duncan of WeatherWatch says it would be mostly cloudy with showers for the western North Island today, and the Bay of Plenty can expect a mainly dry day except for a few afternoon showers.
The east of the North Island can also expect a mainly dry day with high clouds, and northwesterlies tending westerly this afternoon.
However, it will be a wet Monday in the South Island with rain with heavy falls and possible thunderstorms for the West Coast, easing to showers in the afternoon.
Canterbury is forecast to have a dry start but showers will develop by afternoon and rain for inland areas by evening with snow to 500m.
