Southland Region – Water Temperature Overview
Southland 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 | 12°C | 15°C | 18°C |
| February | 13°C | 16°C | 19°C |
| March | 13°C | 16°C | 19°C |
| April | 12°C | 15°C | 18°C |
| May | 11°C | 13°C | 15°C |
| June | 10°C | 12°C | 14°C |
| July | 9°C | 11°C | 13°C |
| August | 9°C | 11°C | 12°C |
| September | 10°C | 11°C | 12°C |
| October | 10°C | 12°C | 14°C |
| November | 10°C | 13°C | 15°C |
| December | 12°C | 15°C | 17°C |
Most Viewed Sea Places in the Southland Region
Current Water Temperature in Lakes and Rivers
About the Region & Location Map
Southland Region, at the southernmost edge of New Zealand, experiences some of the coolest coastal water temperatures in the country. Over summer, from December to February, sea temperatures along the Southern Ocean and Foveaux Strait generally range between 12°C and 15°C, occasionally reaching around 16°C in late summer. Even in the warmest months, the water feels distinctly brisk. In winter, coastal temperatures commonly drop to between 8°C and 11°C. Swimming is allowed at many beaches, but conditions can be challenging due to cold water, strong currents and rapidly changing weather. For this reason, summer offers the most comfortable opportunities, and swimmers should choose sheltered spots and take care.
Inland, Southland’s rivers and lakes are strongly influenced by alpine sources and cooler air temperatures. During summer, freshwater temperatures often range from 13°C to 18°C in lower-lying lakes, while higher-altitude or glacial-fed waters can remain colder. In winter, inland waters frequently fall to between 1°C and 8°C, particularly in elevated areas. Swimming is generally permitted where water quality is suitable and no health advisories are in place, although the cold temperatures mean swims are often short. On fine summer days, however, many lakes and slower river sections provide refreshing and rewarding swimming experiences.