"Overall a fine day for most places.
"However, for the far south things do take a turn for the worse towards the evening, with strengthening westerly winds.
"We are also expecting some rain to push to the south and southwest of the country. Invercargill could see a wet end to the day."
A front was expected to approach the lower South Island from the southwest on Tuesday evening, westerly gales will affect the far south on Tuesday night and Wednesday morning.
A strong wind watch was in place for Clutha and Southland near the coast, including Stewart Island with gales approaching severe strength in exposed areas.
A ridge of high pressure is forecast to dominate much of the country during Wednesday and Thursday.
However, a front was expected to move over the far south of the country from the southwest early on Wednesday, that would be preceded by strong westerly winds.
There was low confidence, a 20 per cent chance, of warning amounts of rain around southern Fiordland, coastal Southland and Clutha on Wednesday.
Southwesterly winds could approach gale force in coastal Southland, coastal Otago and south of Dunedin on Wednesday morning.
Another weak front was forecast to affect the south of the South Island early Thursday, bringing rain.
Your weather
Whangārei: Fine spells, chance shower from afternoon. Light winds. High 19C Low 10C
Auckland: Fine spells. Southwest breezes. High 16C Low 11C
Tauranga: A fine day, some evening cloud. Gusty westerlies developing afternoon. High 19C Low 8C
Whanganui: Cloudy periods, chance evening shower. Westerlies, strengthening evening. High 17C Low 10C
Napier: Morning cloud then fine. Light winds, afternoon sea breezes. High 18C Low 7C
Wellington: A cloudy start, fine spells from late morning. Northerly gradually strengthens. High 15C Low 8C
Christchurch: Fine, chance morning fog. Northeast breezes. High 16C Low 7C
Dunedin: Morning cloud, then fine. Westerlies, strengthening evening. High 17C Low 12C