Parts of Canterbury experienced record-breaking rainfall at the weekend and the effects are still being felt on Monday morning.
State Highway 1 south of Ashburton remains cut off, with the NZ Transport Agency Waka Kotahi's closing the town's River Bridge due to rising river levels.
There were no alternative routes in place overnight.
Specialist rescue crews were also called to McLaughlins Rd in the Canterbury town of Darfield after a person was trapped by floodwaters while driving.
The person needed to climb onto the vehicle's roof and was subsequently treated by St John.
Precautionary self-evacuations also took place in Tuahiwi, north Canterbury. Residents are being urged to stay away until officials give the all-clear.
"While we have crews assessing the area throughout the night, it will be morning before we have a clear picture and can further update residents," the Waimakariri District Council said in a statement.
On Canterbury's Banks Peninsula, there also remained a large amount of surface flooding.
Tyrone Fields, a councillor for Christchurch's Banks Peninsula ward, told AM it had been a busy weekend.
"It's been raining pretty consistently," he said on Monday. "I understand it's been raining overnight.
"Judging by where we were yesterday, I would say there are some pretty challenging circumstances - I would imagine there have been quite a lot of slips over the weekend... that probably hasn't let-up."
In the North Island, meanwhile, Aucklanders have awoken to a thick blanket of fog on Monday morning.
Auckland Airport has confirmed there are fog restrictions in place and flights have been affected.
There have been approximately five cancelled and four delayed domestic regional flights due to the fog.
International flights have not been affected
