A large high covers New Zealand and while it does start to slip off the South Island today it will be replaced by warmer nor’westers. A cold morning for most of NZ but a warmer than average afternoon in the South Island. In the North Island a little cooler today with afternoon temperatures closer to normal for this time of year. 

NORTH ISLAND:
Very early showers clear Northland, dry everywhere else. Light winds with morning fog patches inland. Easterlies more likely in the north, northerlies developing in the south. A cold morning for many. Afternoon temperatures about average, perhaps a little above average in the south.
Highs: 13 to 16

SOUTH ISLAND:
Mainly Sunny with Northerly quarter winds developing, tilting north to north west for many later in the day and helping push temperatures above normal for many, especially in the east. Dry and sunny in most regions but rain developing in Fiordland and perhaps South Westland and clouds thickening later in the day for some areas in the south.
Highs: 11 to 18

– WeatherWatch.co.nz