Wellington Region – Water Temperature Overview
Wellington Region features a coastline as well as numerous rivers and inland lakes. Water temperatures vary significantly by season and location, influencing swimming conditions across coastal and inland areas.
Current Sea Water Temperature
It’s important to note that these swimming tips and recommendations apply only in settled weather. When air temperatures drop below 20°C — and sometimes even below 25°C — swimming can feel uncomfortable, even when water temperatures are relatively high.
Sea Temperature Trends
Over the past month, the sea water temperature has remained largely unchanged. Overall, the sea water temperature is within the range expected based on historical data for this month.
Water Temperature and Swimming Conditions by Month
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 14°C | 17°C | 20°C |
| February | 15°C | 18°C | 21°C |
| March | 14°C | 17°C | 20°C |
| April | 14°C | 17°C | 19°C |
| May | 12°C | 15°C | 18°C |
| June | 11°C | 14°C | 16°C |
| July | 11°C | 14°C | 16°C |
| August | 10°C | 13°C | 16°C |
| September | 11°C | 14°C | 16°C |
| October | 10°C | 13°C | 16°C |
| November | 12°C | 15°C | 18°C |
| December | 13°C | 17°C | 20°C |
Most Viewed Sea Places in the Wellington Region
Current Water Temperature in Lakes and Rivers
About the Region & Location Map
The Wellington Region, sitting at the southern tip of the North Island, experiences cooler coastal waters influenced by Cook Strait and the open Pacific. During summer, from December to February, sea temperatures typically range between 16°C and 19°C, occasionally reaching around 20°C in sheltered bays. These conditions are suitable for swimming on warm, calm days, although the water can feel brisk compared with northern parts of the country. In winter, coastal temperatures usually drop to about 11°C to 14°C. Swimming is allowed at many beaches year-round, but strong winds and currents are common in this region, so it’s important to choose sheltered spots and follow local safety advice.
Inland, Wellington’s rivers and lakes show clear seasonal variation. Over summer, freshwater temperatures often range from 15°C to 20°C, depending on depth, flow and sunshine. Smaller lakes and slower-moving rivers can warm up nicely during settled weather. In winter, inland waters commonly cool to between 5°C and 11°C, particularly in higher or shaded areas. Swimming is generally permitted where water quality is suitable and there are no health warnings, as heavy rainfall can temporarily affect river clarity and bacteria levels. With careful planning and attention to conditions, the region provides a range of swimming opportunities, especially through the warmer months.