Emergency services around the country did not report any major weather-related incidents overnight.
A spokesman for MetService said although there had been surface flooding in some parts of the country over the weekend - including in Timaru - there had been no major weather incidents last night.
In the South Island, Nelson, Blenheim, Christchurch, Ashburton and Timaru are all forecast to be mainly fine today.
Christchurch is forecast to have a temperature high of 11C with a chilly 5C high overnight.
Invercargill and Dunedin are in for cloudy days and periods of showers.
Cold southwesterly winds are also expected and those in Invercargill will be in for a cold night, with an overnight high of 3C.
MetService says a risk of thunderstorms is set to increase later tonight for Taranaki and the west coast areas from Waitomo to Auckland.
A spokesman said if thunderstorms do arrive, people can also expect to see heavy rain - and possibly hail - in these areas late tonight.