Flooding has closed SH25 between Whitianga and Kaimarama, while on the other side, SH25A (Kopu-Hikuai Rd) has been blocked by a slip through the Coromandel Forest Park.
Heavy downpours have also nearly closed roads on the southern approaches to the Coromandel, with SH25 nearly underwater south of Tairua and surface flooding on SH2 between Paeroa and SH1.
Herald reader Babette Maas sent in a photo of cars passing through waters up to their axles, saying it was likely the dreadful weather conditions would lead to parts of the road becoming impassable shortly.
Residents in Matatoki, south of Thames, are facing a water shortage.
Elsewhere, Taranaki motorists are being warned to take care as strong winds hit the area.
The strong winds are hitting State Highway 45, between New Plymouth and Opunake. Trees are down in some places and police are asking motorists to take extra care or delay non-urgent travel.
The wild weather and gale-force winds earlier closed roads, felled trees, flooded properties and caused power cuts in Auckland.
The downpours hit the north early this morning, bringing 34.5mm in one hour to some Auckland suburbs while easterly gusts reached up to 113km/h in the Hauraki Gulf.
Albany recorded 31.3mm of rain between 7am and 8am today - the third-wettest hour since records for that area began almost nine years ago, according to Niwa.
The heavy rain brought plenty of surface flooding to low-lying areas, causing disruptions on some of Auckland's busiest roads.
Motorists were delayed on the Northern Motorway with the brief closures of Oteha Valley Rd on-ramp and two of its lanes in Rosedale.
Tamaki Drive has also reopened after being closed around high tide.
Meanwhile those on SH1 in Warkworth are still facing major delays due to a car hitting a power pole.
Contractors have now opened SH28 with a stop-go system in place but NZTA still warns of delays.
Northlanders, Aucklanders and those along the coast in the Bay of Plenty were warned to watch out for flooding as rain and high winds coincide with a king tide this morning and again this evening.
High tide in Auckland this morning was at 8.53am. The next high tide is at 9.19pm.
