A southwesterly airflow lies over the country today, plenty of wet weather in the west and far south. Drier in the east but a few showers are still likely.

Northland, Auckland, Waikato & Bay Of Plenty
Showers, heavy at times with a risk of hail and perhaps thunder, strong southwesterlies tend westerly in the afternoon then back to the southwest in the evening. Bay Of Plenty has a lesser chance of showers but still the odd one especially early morning then again later in the day.
Highs: 13 – 15

Western North Island (including Central North Island)
Showers, heavy at times from afternoon as westerlies freshening.
Highs: 6 – 14

Eastern North Island
A mix of sun and cloud, rain or showers for Wairarapa. In the afternoon a few brief showers may stretch further northwards for a time as westerlies change southwest. 
Highs: 12 – 16

Wellington
Rain in the morning then spits or showers from midday as southerlies tend west to northwest. Winds may swing to the southwest at night.
Highs: 11- 12

Marlborough & Nelson
Partly cloudy, the odd shower. Showers more frequent for Tasman turning to rain in the afternoon. Snow above 800m. West to southwesterly winds.
Highs: 10 – 13

Canterbury
Mostly cloudy with occasional showers, dry spells too. A few snow flurries to 800m in the morning, perhaps a touch lower later in the day. Southwesterlies.
Highs: 7 – 10

West Coast
Cloudy areas with the odd shower, rain north of Hokitika from midday. Overnight rain becomes widespread. Snow to 800m in the north, 500m for Fiordland. Southwesterlies.
Highs: 9 – 12

Southland & Otago
Cloudy areas and occasional showers, rain overnight for Southland. A few snow flurries to 500m, maybe 400m at a push. Parts of eastern Otago stay dry all day. Cold west to southwesterly winds.
Highs: 6 – 8