I’m not sure when you are leaving to go down there but all day Saturday will be good driving, sunny with some cloud increasing towards evening and westerlies. Showers later overnight.

Cloudy on Sunday with breezy northwesterlies, odd shower turning to rain between Auckland and Taranaki in the afternoon then all areas of precipitation easing at night.

West to northwesterly breezes on Monday, cloudy areas with the odd shower. At night southerlies develop with showers clearing in the areas you mention.

Tuesday will see an east to southeasterly airflow so conditions may be dry but as you get back into the Waikato the odd shower may be possible again but still, generally dry conditions are more likely. Showers or rain or more likely north of Coromandel and Auckland on Tuesday.

Cheers
Aaron