A lot of places, including Auckland, recorded their coldest temperatures of the year in the past week, he said.
It had dropped down to 5C in Auckland on Monday but this coming week the lowest temperature should be about 10C overnight, he said.
"Over the next couple of days, winds are going to swing back around to the west, that means things are going to feel a lot warmer.
"Warmer actually then you would expect at this time of year."
There was going to be cloud building up through this evening and into tomorrow in Auckland, Adams said.
"Don't expect to see heaps of sun once the cloud starts coming in," he said.
There would be fine breaks but not a huge amount of sunshine, he said.
Cold strong southwesterlies over the county are expected to ease tomorrow.
A high of 17C is expected in Northland and Auckland tomorrow, while Wellington is set to reach 15C and Christchurch 14C.
On Tuesday, a front is forecast to approach the country from the southwest then move north over the South Island on Wednesday.
Rain is forecast to return to Auckland on Wednesday as showers hit the top of North Island down to Tauranga and Hamilton.
Main centre forecast today
Whangārei
Fine. Light winds. High 17C, low 9C
Auckland
Fine, apart from some evening cloud. Southwesterly breezes. High 16C, 10C
Hamilton
Fine then clouding over this evening. Westerlies developing. High 14C, 6C
Tauranga
Fine. Light southerlies tending westerly this afternoon. High 15C, 8C
Wellington
Partly cloudy. Northerlies strengthening. High 13C, 10C
Nelson
Fine with high cloud. Southwest breezes. High 14C, 10C
Christchurch
Fine with high cloud Northeasterlies. High 13C, 3C
Dunedin
Fine, high cloud. Northerlies. High 13C, 7C
Source: MetService