The mercury will continue falling to hit a low of 4C tomorrow night followed by a frigid high of 14C on Wednesday. However, temperatures should climb to 17C by the end of the week.
Whangārei is tipped to hit a top of 16C today and a high of 15C tomorrow.
Hamilton can expect a high of 15C today before clear and sunny highs of 13C midweek, when night time temperatures will drop to 1C.
Tauranga can expect a top today of 15C followed by midweek highs of 14C. A few showers and top of 14C are tipped for New Plymouth, followed by fine weather and tops of 13C midweek.
Napier is set for fine weather today and a high of 16C before the weather takes a dive to 13C midweek with an overnight low of 1C on Wednesday night.
Wellington is set for clear skies and a top of 12C today, followed by an overnight low of 6C and showers tomorrow with a high of 10C.
Christchurch residents should be waking to frosts this morning and snow down to 700m. The mercury is expected to hit a top of 11C with afternoon showers.
The city's heaters will then need to be turned up tonight as an overnight low of -1C is tipped followed by midweek highs of 10C.
Possible morning thunderstorms and heavy rain is tipped for Dunedin today along with a high of 9C. The thermometer could then drop to 2C tomorrow night.
Snow had been forecast to possibly fall down to 500m around the city overnight.
Sleety rain and a high of 8C are forecast for Queenstown. Overnight temperatures could drop to -3C tomorrow night.
Today's weather
Whangārei: Fine spells. Southwesterlies. High 16C, Low 8C
Auckland: A few showers, with fine spells in between. Southwesterlies. High 15C, Low 9C
Hamilton: Cloudy periods, and a few showers clearing tonight. Southwesterlies. High 15C, Low 3C
Tauranga: Fine, then chance shower from afternoon. Southwesterlies. High 15C, Low 5C
Rotorua: Partly cloudy, with chance shower from afternoon. Southwesterlies. High 12C, Low 2C
New Plymouth: Cloudy periods with a few showers. Clearing at night. Westerlies. High 14C, Low 3C
Napier: Fine. Westerly winds. High 16C, Low 3C
Whanganui: Cloudy periods with a few showers. Clearing at night. Westerlies. High 14C, Low 5C
Wellington: Fine. Northwest turning southwest evening. High 12C, Low 6C
Nelson: Fine. Southwesterlies. High 13C, Low 1C
Christchurch: Few showers from afternoon, mainly about Banks Peninsula with snow to 700m. High 11C, Low 4C
Dunedin: Showers, possibly heavy with hail or morning thunderstorms, easing evening. Snow about the hills. High 9C, Low 5C