Hamilton will be fine all weekend, but getting down to low temperatures of 4C or 5C and there could be a possibility of frost, Mr Corbett said.
Northland and Coromandel peninsula could be in for some wet weather with showers.
The East Coast will feel a drop in temperature, going from 20C during the week to around 16C on the weekend. Aside from the chance of a few drops of rain on Saturday in Gisborne, it will be fine all weekend.
A southerly bringing temperatures of around 16C to Wellington will hang around on the weekend but start to ease on Sunday.
"We have got a pretty good prospect for a dry weekend, anyone coming down to the capital just grab an extra layer," Mr Corbett said.
The South Island could be in for a fine and frosty weekend.
Queenstown and Christchurch will have clear skies but low temperatures, typical of late autumn, Mr Corbett said.
Christchurch will have a high of 12C tomorrow and 14C on Sunday but a low of around 2C overnight.
Mr Corbett said Queenstown will be similar.
"Lovely by day, but extra logs on the fire at night because it will be a bit on the chilly side."
Around the country:
Auckland: Chance of showers on Saturday with some cloud, light winds and a high of 18C. Sunday will be fine with a cool southerly.
Hamilton: Fine with light winds both Saturday and Sunday. A high of 17C by day and getting down to 4C overnight.
Wellington: A southerly on Saturday will keep temperatures low around 14C, but should ease on Sunday. Some cloud expected on Saturday but will clear on Sunday reaching a high of 13C.
Christchurch: Fine with morning cloud clearing on Saturday. Southwesterly brings cold temperatures overnight, but will be dying out on Sunday. Expected to reach 12C on Saturday and 14C on Sunday.