A strong wind watch was also in place for much of Otago and Southland from today.
For inland parts of Otago northwest winds could approach severe gale in the 24 hours from 3pm this afternooon.
The same watch was in place for Southland west and north of Mossburn, and Fiordland, but from 9am this morning to 11am tomorrow.
A heavy rain watch is in place for the Otago headwaters for the 12 hours from 3am tomorrow.
Meanwhile, back ice has caused at least seven crashes on South Island roads so far this morning.
Senior Sergeant Craig Dinnissen, of Dunedin, said police were continuing to deal with crashes around the city due to icy conditions.