"The spring weather is expected to continue as we head into the weekend," she said.
More rain was expected with strong to gale northwesterlies first arriving in the south, then moving north.
The gale would potentially be severe in exposed places east of the Southern Alps on Saturday.
A severe weather watch was in place for Hawkes Bay and Wairarapa. MetService said the region could be in for gale northwesterly winds tomorrow but should ease by the evening.
The wind precedes the next frontal system, which brings heavy rain from Fiordland to Buller by Sunday.
"The front is expected to weaken as it heads towards the North Island at the beginning of next week, although a period of heavy rain is likely for the Tararua Range," Ms Louw said.
The top of the North Island would escape the worst of the weather. Some showers would hang around on Friday and Saturday but clear for Sunday.
WEEKEND OUTLOOK:
Whangarei: Cloudy periods and showers tomorrow that will clear for fine spells over the weekend.
Auckland: Cloudy periods and showers tomorrow and Saturday but will clear for fine spells on Sunday.
Hamilton: Showers on Friday and into Saturday morning, clear by afternoon. Cloudy periods on Sunday.
Tauranga: Long fine spells tomorrow. Cloudy periods on Saturday turning to drizzle on Sunday.
Wellington: Showers may be heavy tomorrow afternoon. Fine on Saturday turning to rain and gale northwesterlies on Sunday.
Christchurch: Showers tomorrow will clear to make way for a fine Saturday. Gutsy northwesterlies on Sunday.
Dunedin: Showers tomorrow will clear to make way for a fine Saturday. Rain on Sunday.