A northwesterly airflow lies over New Zealand today, rain or showers in the west for most. Mainly dry and warm in the east.

Northland, Auckland, Waikato & Bay Of Plenty
Sunny spells, showers move into northeastern Northland during the morning then a few may spread down to reach Auckland in the evening. Risk of a shower in the afternoon for Waikato and Bay Of Plenty. Northwesterly winds. Overnight fog possible for the Waikato.
Highs: 18-20

Western North Island (including Central North Island)
Partly cloudy with a few showers, clearing in the evening. Chance of a heavy fall with some thunder about Kapiti / Manawatu for a time. Breezy northwesterlies.
Highs: 15-17

Eastern North Island
Sunny and warm, northwesterly winds.
Highs: 19-23

Wellington
Mostly cloudy with the odd shower, especially in the north. Brisk to strong northwesterly winds.
High: 16

Marlborough & Nelson
Sunny and warm. Breezy north to northwesterly winds.
Highs: 17-21

Canterbury
Morning high cloud then breaking to a mostly sunny afternoon, west to northwesterly winds gradually ease.
Highs: 16-20

West Coast
Morning rain with heavy falls and thunderstorms possible then easing to showers, breezy northwesterly winds.
Highs: 12-14

Southland & Otago
Showers about Southland and Coastal Otago, some sun may break through at times. Showers clear in the evening. Central Otago has partly cloudy skies. Light winds tend to the south about Southland and coastal Otago, northwest for inland areas.
Highs: 11-15

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz