Waka Kotahi NZ Transport Agency and MetService are urging motorists to take care and avoid unnecessary travel, with heavy rain warnings in place for the Coromandel and Bay of Plenty.
Waikato motorists should also remain alert, with a heavy rain watch in place.
Waka Kotahi NZTA regional manager maintenance and operations Rob Campbell says motorists should expect the unexpected and remain alert.
"Avoid unnecessary travel and take care. Heavy rain may cause streams and rivers to rise rapidly and there is a chance we may need to close some roads.