Upper North Island
Expect mainly sunny weather with some increasing high cloud, winds from the west.
Lower North Island
Cloudy in the west, perhaps even the odd patchy shower about, mainly sunny with high cloud developing for the east coast. Northwesterly winds becoming strong overnight with gales about Cook Strait / Wellington.
Upper South Island
Cloudy for the West Coast with rain, heavy at times with torrential falls and thunderstorms developing in the evening. Northwesterly winds strengthen changing strong southwest overnight. Some rain for Canterbury (mainly Banks Peninsula southwards) clears in the evening for areas east of the foothills. Rain quite heavy about the high country in the evening / overnight with thunderstorms possible. East to northeasterly winds freshen for most in the east although northwesterly winds strengthen about North Canterbury from afternoon rising to gale at times. Strong to gale northwesterly winds spread to most areas of the east coast overnight.
Lower South Island
Southland and Otago see some morning sun then rain moves in during the afternoon possibly heavy for a time evening onwards. Rain may be heaviest in the evening / overnight inland where thunderstorms are possible too. Northeasterly winds freshen from afternoon then overnight winds change northwest. Northwesterly winds may rise to severe gale by dawn about Otago. Gale south to southwesterly winds develop by dawn about Southland.