Kiwis to bathe in 'exceptionally warm' weather before blast of Mother's Day rain

The next couple of days will be toastier than usual for Kiwis across New Zealand before a burst of heavy rain on Mother's Day.

Ahead of a massive anticyclone set to hit the country next week, WeatherWatch forecasts that all regions will have a warmer than average Thursday and Friday.

With the exception of Nelson and Marlborough, every South Island region on Thursday will be 4 to 8C above the normal temperature for this time of the year. On Friday, all regions will be in that category.

In the North Island, all regions will see higher than usual temperatures over the next two days with some also expected to be 4 to 8C above normal.

Some centres will be lucky enough to have highs in the low 20s, with Hawke's Bay potentially reaching 23 to 25C on Friday. WeatherWatch said that would be "exceptionally warm for the second week of May".

The warm temperatures are the result of sub-tropical air blowing across the country, but it won't last forever.

Rain is expected to hit some regions this weekend, with the West Coast forecast to be in the firing line for the worst of the wet weather on Mother's Day. Other areas will also see temperatures drop with cool winds.

"Cold weather [is coming] to the lower South Island from Sunday, and while northern NZ will lose a few degrees off the daytime highs, the upper North Island will be least impacted by the cool down next week."

A monster anticyclone over 4000km-wide is moving over Australia in the coming days before moving our way by the start of next week.

Weather Watch says that while it will briefly bring some nice weather, it's likely to encourage more windy, wetter, colder sou'westers later on.