Despite a cooler morning most of the country should warm up for a fine and sunny winter's day.
Tomorrow and Thursday morning were likely to be much cooler in the North Island, Glassey said.
"The ridge of high pressure is pushing onto the country fully today, so the winds will drop out leading to cool nights."
Apart from a small front brushing the bottom of the South Island tomorrow, bringing a bit of rain to Southland and Clutha, the country was in for several days of fine weather.
On Friday, a strong northwest flow spreads over central and southern New Zealand ahead of a front forecast to move northwards across the country on Saturday, delivering rain to western regions.
Today's weather
Whangārei
A few morning showers, then fine. Southerly winds. 15C high, 5C overnight.
Auckland
Fine apart from patches of morning fog. Southerlies. 13C high, 4C overnight.
Hamilton
Morning fog then fine. Light southerlies. 13C high, -2C overnight.
Tauranga
Fine with light southerlies. 15C high, 3C overnight.
New Plymouth Fine. Southeasterlies, dying out evening. 12C high, 2C overnight.
Napier Cloudy periods, chance shower. Southwesterlies, easing by evening. 12C high, 3C overnight.
Wellington The odd morning shower, then becoming fine. Southerlies gradually dying out. 10C high, 4C overnight.
Nelson Fine. Light winds. 12C high, 0C overnight.
Christchurch Fine apart from morning cloud. Northeast breeze developing afternoon. 11C high, -1C overnight.
Dunedin Fine apart from morning cloud. Northerlies developing afternoon. 10C high, 2C overnight.