"There's a southerly to southeasterly flow through the north today, which will bring cloudier conditions in the east to north, and it will be fine in the west."
New Plymouth residents may have noticed a heavy downpour last night.
"They saw over 40mm in two hours, between 1-3am in the morning."
Ranger said the rain last night was part of a front that moved across the North Island, through Taranaki, and was now sitting over Hawke's Bay.
Tonight the temperature was expected to drop to 3-4C around South Canterbury and Otago.
Here's how the weather is looking around the country today:
• Northland and Auckland A few showers, some heavy with thunderstorms possible in Northland this afternoon.
• Waikato, Waitomo, Taumarunui, Coromandel Peninsula, Bay of Plenty and Taupo Showers, some heavy and thunderstorms possible, clearing this afternoon or evening.
• Gisborne and Hawke's Bay Rain spreading north today, with possible afternoon thunderstorms, easing to isolated showers this evening.
• Taranaki and Taihape to Wellington, also Wairarapa A period of rain this morning, then increasing fine spells.
• Marlborough, Nelson and Buller Fine spells and isolated showers.
• Westland Fine.
• Canterbury Cloudy with patchy morning rain, then fine spells.
• Otago, Southland and Fiordland Fine, apart from isolated showers, clearing this afternoon.
• Chatham Islands A period of rain this afternoon, briefly heavy.