Metservice forecaster Karl Loots told Newshub the storm caused surface flooding in parts of the city.
"Winds are forecast to become severe at times, with gusts reaching 120km/h in exposed places."
Large swells are expected throughout Wednesday.
At least three of these may be severe, reaching category 3 or higher.
MetService is issuing warnings and watches for heavy rain, heavy snow and severe gales.
Minimum temperatures may drop to near-freezing in some portions of the lower South Island.
While both islands are in for a battering, the south will bear the brunt.
A complex tough will bring rain and strong winds to many places.
A forecaster gives its prediction for next month.