Sea level data, predictions and calculations to help navigate New Zealand tides and tidal streams.

Installing a tide gauge at Castlepoint

New Zealand is surrounded by sea. Whether commercial or recreational boaties, surfers or fishermen, all seafarers must navigate the tides of the oceans that make up New Zealand’s waters.

Tides are the ebbing and flowing of oceans, caused mainly by the gravitational pull of the moon. In New Zealand we experience high and low tides twice a day, at different times each day. The varying sea levels can heighten the risks of navigation hazards. That’s where we come in – providing daily tide predictions for main sites around the coast of New Zealand, its offshore islands and Antarctica. We also produce tide calculation tables for New Zealand’s coastline to cover the areas in between.

We gather the information for these predictions from a network of sea level monitoring sites that we’ve established to help New Zealand respond quickly to tsunami hazards. The information is averaged both in terms of the sea levels over time and the impacts of different weather patterns. You can find this data, along with sea level information from other sources, here online.

We also provide predictions for other potentially hazardous water movements in some areas of New Zealand. Tidal streams are bodies of water that run in a horizontal direction for a time. Our tidal stream predictions help seafarers navigate round these hazards. In New Zealand, particularly strong streams occur in Te Aumiti (French Pass), the entrance to Tory Channel and Cook Strait.


The tide predictions on this website are not official tide tables as specified in Maritime Rules Part 25 Nautical Charts and Publications (pursuant to Section 36 of the Maritime Transport Act 1994).

LINZ accepts no liability for any direct, indirect, consequential or incidental damages that result from any errors in the information, whether due to LINZ or a third party, or that arise from the use, or misuse, of the information available from this site.