The short-lived fine spell came to an abrupt halt today as many parts of the country woke to single-digit temperatures, and thunderstorms in the north.
The sun gave temperatures a boost yesterday and kept the rain at bay in what forecasters said was likely to be the best weather all week.
MetService said areas of low pressure coming in from the Tasman Sea meant a wet Wednesday could be in store for many.
Thunderstorms were expected to hit Northland this morning, in particular its eastern areas, and the north of Auckland - including Great Barrier Island.
"The thunderstorms, if they occur, have the potential to bring localised heavy rain with intensities of 15-25mm an hour and possibly more in one or two places," said the weather forecaster.
A lower risk of thunderstorms extended to the remainder of Auckland and the northern Coromandel Peninsula.
This morning started with all but the far north experiencing sub-10C, and a few frosty spots.
Invercargill sank to a chilly -0.6C.
However, despite the expected wet weather, temperatures were forecast to pick up.
MetService predicted most should rise into the double digits, and Whangarei reaching a balmy 18C this afternoon.
Around the main centres Auckland was expected to have the rain throughout the day before easing to showers by evening, with a high of 16C.
Wellington was only expected to get the odd drizzle, despite the frequent clouds MetService said would linger throughout the day. Winds would be breezy and a high of 14C forecast.
Further south in the garden city, the skies were likely to be overcast, with only the occasional drizzle, light winds and a high of 12C.
Dunedin was forecast to be one of the few to see sun today, as the clouds will not thicken until later in the evening, with only a chance of drizzle.