A low west of New Zealand in the Tasman Sea is dragging a humid northeasterly airflow over New Zealand today, expect unstable conditions to develop over western parts of the North Island with possible heavy downpours and thunderstorms being the result. Meanwhile a front moves slowly through Northland this morning and early afternoon then gradually southeastwards during the rest of the day and overnight. The South Island is fairly cloudy with rain or showers for many apart from in the far south.

Northland, Auckland, Waikato & Bay Of Plenty

Western North Island (including Central North Island)
Some morning sun then cloud builds from midday, isolated showers developing for many in the afternoon then heavy falls and thunderstorms are possible mainly in the west. Further inland about the Central North Island may not see heavy showers in the afternoon. A more widespread rain with heavy falls moving into Taranaki in the evening then eastwards overnight. Light winds for most although expect breezy northeasterlies about Taranaki.
Highs: 23-30

Eastern North Island
Sunny areas with east to northeasterly winds, a few showers possible mainly after midday then mostly clearing in the evening. Some rain moves into parts of the Wairarapa especially in the south in the evening however and continues overnight.
Highs: 25-27

Southland & Otago
Cloudy areas with south to southeasterly winds, winds tend more easterly about coastal Otago where there could be a drizzle patch or two during the day.
Highs: 15-20

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz