A cold southwesterly airflow lies over New Zealand today.

Northland, Auckland, Waikato & Bay Of Plenty
Mostly sunny, a few showers for Northland however and perhaps northern Auckland. Southwesterly winds.
Highs: 12-15

Western North Island (including Central North Island)
Mostly cloudy with the odd shower, small hail possible at times. A few snow flurries down to 500 – 400m. Showers ramp up overnight with slightly heavier falls for a time (especially about the Central Plateau with snow to 500m). Northern Taranaki has longer sunny / dry periods during the day. Cold south to southwesterly winds.
Highs: 6-11

Eastern North Island
Cloudy areas, the odd shower. The odd snow flurry to 500m, 400m about Wairarapa. Showers ramp overnight about Wairarapa then towards dawn on Thursday for Hawkes Bay. Cold southwesterly winds.
Highs: 8-12

Wellington
Showers, a chance of small hail. Strong southerlies may rise to gale at times later in the day. Evening showers may be heavy, snow flurries to 400m.
Highs: 8

Marlborough & Nelson
Mostly cloudy about southern Marlborough (south of the Wairau Valley), showers at times with a risk of small hail, showers may be heavy at night. Snow to 400m. The rest of Marlborough has a mix of sun and cloud, Nelson has a sunny day. Cold southwesterly winds.
Highs: 8-12

Canterbury
Any morning showers clear South Canterbury then sunny spells break through. Showers ease about Mid Canterbury becoming restricted to coastal areas in the afternoon. North Canterbury sees showers for much of the day, a risk of small hail (mainly morning). Snow flurries to 400m, 300m at times into the hills of North Canterbury. The hills of North Canterbury could experience persistent snow for much of the day, heavy from evening. Fresh cold southwesterly winds.
Highs: 3-8

West Coast
Sunny, southeasterly winds.
Highs: 9-12

Southland & Otago
Mostly cloudy with the odd shower, perhaps a few light snow flurries to 400m. Dry periods too. Cold south to southwesterly winds.
Highs: 6-9

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz