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Snow flurries are possible to 500m in Dunedin this evening, while Queenstown could be in for a light snowfall as a cold front moves up the country.
Road snowfall warnings are in place for Lewis Pass (SH7), Crown Range Rd, and Milford Rd (SH94).
Temperatures are also starting to cool as southwesterly winds cover the country, with lows in the South Island dropping to 1C in Christchurch and Queenstown, and the Hawke's Bay in the North only a few degrees warmer at 5C.
A front that moved north over Westland last night, then Buller and western Nelson this morning, is bringing a low risk of thunderstorms to Westland before dawn and Buller and western Nelson in the morning.Following the front there is a low risk of thunderstorms in the south for Fiordland, Stewart Island and coastal Southland.
Strong and unsettled southwest winds are expected for much of the country tomorrow, with south to southwest gales affecting some coastal areas in the east of both islands.
A large area of south to southwest gales and heavy southwest swell are expected to affect the waters between New Zealand and the Chatham Islands during Monday and Tuesday.A ridge of high pressure should build over New Zealand on Tuesday, then move eastwards on Thursday as a low pressure system approaches the country from the Tasman Sea.
The combination of the cooler temperatures from the cold southwest winds and the high pressure, which means much of the country will experience clear and calm nights, will cause temperatures to drop dramatically midweek.
Much of the South Island will wake up to around freezing or below 0C on Wednesday, with much of the North Island temperatures dropping to below their average for this time of year as well.
Parts of Taupo, Taumarunui, Waikato and inland Bay of Plenty will be either around 0C or below. A special mention for the Coromandel which will drop up to 6C below their average for this time of year.
Even Aucklanders who boast an average 8.8C for their minimum temperature during June months will feel the cold at 4C.