"On Sunday, a front starts to move up the South Island and there will be a few showers in the east of the South Island throughout the day.
"That front makes it to Wellington late Sunday, meaning a little bit of rain late in the day."
A watch remained in place today for westerly winds on Stewart Island and coastal areas in the South Island such as Southland and Clutha, Ranger said.
As for the heat, temperatures were looking "pretty normal for this time of year".
A lot of places would hit temperatures in the low 20Cs and high teens, she said.
Today's forecast
Whangarei: Sunny, but some morning cloud. Southwesterlies. High 22C Low 12C
Auckland: Sunny, apart from morning cloud. Southwesterlies. High 20C Low 13C
Hamilton: Sunny, apart from morning cloud. Southwesterlies. High 20C Low 6C
Tauranga: Sunny with a high of 22C, low 11C
New Plymouth: Sunny, apart from morning cloud. Southwesterlies. High 18C Low 10C
Napier: Sunny. Westerlies, then afternoon sea breezes. High 25C 10C
Wellington: A sunny day with northerlies. High 18C 13C
Nelson: Sunny with southwesterlies. High 20C Low 10C
Christchurch: Sunny. Northwest tends northeast for a time. High 23C Low 8C
Queenstown: Sunny. Breezy westerlies dying out. High 17C Low 7C
Dunedin: A sunny day. Westerlies easing afternoon. High 19C Low 10C