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MetService meteorologist Stephen Glassey said temperatures were already climbing into the double-digits in most parts of the country this morning.
Dunedin has been sitting pretty as the centre with the highest temperature in country since about 11am today.
Some parts of the country, including the West Coast of the South Island and Fiordland, are expected to miss out on he warm weather completely however.
Metservice predicts two troughs are on their way bringing rainfall, snow and strong winds to parts of the South.
Tomorrow a trough is forecast to move slowly east across the South Island preceded by a moist north-to-northwest flow, then followed by strong, cold and disturbed southwesterlies.
This trough delivers periods of rain to western areas, and the heaviest rain is expected along the South Island's West Coast.
Southwesterlies are expected across the lower South Island on Monday and early Tuesday, and showers may turn to snow down to 400 metres, possibly lower, in southern Fiordland, Southland, and Otago, Metservice said.
Another trough is expected to hit on Tuesday from the west.
This trough should bring further rain to the west of the South Island, with low confidence of warning amounts of rain accumulating in Fiordland.
In addition, it is possible southwesterly winds could become severe in exposed parts of southern Fiordland, Southland and eastern parts of Otago later Tuesday through to Wednesday. Showers may turn to snow down to 400 metres again on Wednesday in southern Fiordland, Southland, and Otago.
Snow to these levels could disrupt travel about higher passes and roads, and in combination with strong winds, cause stress to livestock, Metservice said.
- additional reporting NZ Herald