New Zealand — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of New Zealand. Learn about today’s conditions, monthly averages, and how the surrounding seas and oceans vary by season. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
- Auckland17°C
- Christchurch13°C
- Gisborne16°C
- Paihia19°C
- Kaikoura13°C
- Raglan17°C
- Whitianga18°C
- Manu Bay17°C
- Hokitika15°C
- Waitara17°C
- Thames17°C
- Riverton13°C
- Tairua19°C
- Murrays Bay18°C
- Maketu18°C
- Picton14°C
- Waitakere17°C
- Westport16°C
- Karekare Beach17°C
- Whakatane18°C
- Dunedin13°C
- Wellington15°C
- Hot Water Beach18°C
- Ninety Mile Beach19°C
- Coromandel17°C
- Whangamata18°C
- Castlepoint14°C
- Taipa19°C
- Katikati17°C
- Tauranga17°C
- Gillespies Beach14°C
- Ahipara18°C
- Wanganui16°C
- Waihi Beach18°C
- Whangarei18°C
- Lower Hutt15°C
Coastal Seas and Oceans
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
New Zealand’s long, varied coastline means sea temperatures vary widely by region and season. In summer (December–February) coastal waters around the warmest northern bays typically reach about 20–23 °C (68–73 °F), while central coasts commonly sit around 18–20 °C (64–68 °F) and exposed southern shores are cooler, often 14–17 °C (57–63 °F). In autumn (March–May) temperatures generally fall a few degrees, with northern areas around 17–20 °C (63–68 °F), mid-coast waters 15–18 °C (59–64 °F) and southern waters 12–15 °C (54–59 °F). Winter (June–August) brings the coldest sea conditions: northern coastal water is often 12–16 °C (54–61 °F), central coasts 10–14 °C (50–57 °F) and southern and subantarctic-influenced areas can drop to about 6–10 °C (43–50 °F). Spring temperatures rise again toward summer levels, with sheltered bays warming fastest.
Swimming Conditions
Swimming is widely allowed and popular, particularly in summer when many beaches are patrolled by surf lifesaving clubs. However, conditions can be challenging: strong winds, swell, rip currents and sudden temperature changes make some sites unsuitable without precautions. Warmer, sheltered harbors and protected beaches are best for casual swimming; on cooler coasts wetsuits are commonly used for comfort and safety. Remote or unpatrolled beaches require extra caution and local knowledge. Overall, New Zealand offers abundant swimming opportunities year-round, but water temperature, weather and surf conditions should guide decisions about where and when to enter the sea.