However, rain will clear overnight tonight.
"Things are improving quite quickly tomorrow."
Today was much calmer than yesterday, when wild winds lashed the capital for much of the day, Mr Loots said.
"There will be northerly wind today but it will improve tomorrow."
The South Island would mostly be fine, with "nothing severe" after strong winds overnight Friday.
Your weekend weather
Whangarei
Today: Showers, chance of heavy thunder. Northerlies. 25C.
Sunday: Mostly cloudy, a few showers. Southeasterly dies. 21C.
Auckland
Today: Showers to rain morning, chance of heavy thunder. Northerlies. 23C.
Sunday: Long fine spells. Light winds. 22C.
Hamilton
Today: Rain, chance heavy/thunder, clears night. 22C.
Sunday: Fine apart from some morning cloud. Light winds. 23C.
Tauranga
Today: Rain, chance heavy/thunder, clears night. 23C.
Sunday: Fine with light winds. 23C.
Wellington
Today: Rain clearing this morning then fine. 18C.
Sunday: Fine. Southerly dies out, northerly develops. 19C.
Christchurch
Today: Fine, chance shower with evening southerly change. 22C.
Sunday: Fine apart from some morning cloud. Northeast develops. 16C.
Dunedin
Today: Occasional showers, chance heavy/hail. Southwest change. 18C.
Sunday: Fine. Northerlies developing. 15C.