Last week, several parts of the country were stuck in the oven on the roast setting with some areas even breaking temperature records.
However, the weekend saw temperatures drop back down to normal as a front accompanied by cooler air cooled the country down.
A second cold front will slide over southern parts of the country on Tuesday before covering the remainder of the New Zealand on Wednesday.
"That will bring cooler southerly winds and it will bring a few showers on to eastern areas and that will include upper Northland as well," Little said.
"For Christchurch we're forecasting maximum temperatures of 30°C or more on Monday and Tuesday.
"After the passage of the cold front a high of just 16°C is likely on Waitangi Day."
MetService's Monday forecast:
Whangarei: Cloudy periods, a few showers until late afternoon. Easterlies. High 25C, Low 18C.
Auckland: Cloudy periods in the north, fine in the south. Easterly breezes. 27C, 17C.
Tauranga: Fine, some evening cloud. Light winds and sea breezes. 25C, 17C.
Hamilton: A fine day. Light winds. 28C, 13C.
Napier: Fine, with northeast breezes dying out in the evening. 26C, 16C.
Whanganui: Fine, evening cloud. Westerly breezes. 26C, 17C.
Wellington: Mainly fine, morning and evening cloud. Northerlies becoming strong in exposed places in the morning. 22C, 18C.
Christchurch: A fine day. Northerlies. 31C, 14C.
Dunedin: Fine. Cloud increasing from afternoon with chance shower. Northeast breezes. 23C, 16C.
Invercargill: Cloud increasing, occasional rain developing evening. Northwesterlies. 23C, 13C.