The fine weather will please people keen to get out and about during the second weekend of level 2, when they can finally enjoy a drink at a bar. It will also be good news for those looking forward to the opening of duck shooting season.
James said a ridge of high pressure has been well settled over the country, bringing plenty of clear skies and light winds, which bring cold conditions overnight.
"That ridge persists over the North and South Island, right through until the end of Saturday. Generally the story is going to be similar conditions today as on Saturday.
"On Sunday it's a little bit of a different story with a system coming in from the Tasman."By the end of Sunday, most western parts of the country will have some rain."
That low pressure system is expected to linger for a few days early next week, he said.
But although it would get wet, it would also get warmer with the low pressure system bringing warm northerly winds.
Overnight temperatures will increase around 10C in some areas. Hamilton had an overnight temperature of -1C today, but on Monday that will increase to 11C.
Auckland had a low of 6C overnight, but on Monday that will increase to 14C.
Unfortunately for South Islanders there wouldn't be any dramatic change. Dunedin is expected to be 7C overnight Monday, up from 5.5C today.
FINE WEEKEND WEATHER
Today Friday Saturday Sunday
Auckland 17 18 18 19
Hamilton 16 17 17 17
Tauranga 17 18 18 18
Wellington 14 16 15 16
Christchurch 17 18 15 16
Dunedin 15 16 15 14