Nelson – current water temperature and swimming conditions

Water Temperature in Nelson: Daily Trends, Historical Records, and Forecast

⚠️ This is cool water that may feel brisk on entry. Swimming is usually limited to short sessions, and prolonged stays can become uncomfortable without thermal protection. Many swimmers choose a wetsuit, especially for surfing or open-water swimming.

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.

Water Temperature Over the Last 30 Days

Water temperatures in Nelson have been gradually cooling over the past month, with a further drop recorded during the last week.

According to our forecast, Sea water temperature in Nelson will be 17.5°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Nelson sits near the South Australian border where the Glenelg River meets the Southern Ocean, and this position shapes both water temperature and swimming conditions. The ocean side is influenced by the Great Australian Bight, keeping sea temperatures cool throughout the year. In summer, the water is usually around 17–20°C, which feels refreshing on hot days. Autumn sees a gradual drop to roughly 15–18°C, while winter is noticeably cold, often around 12–14°C. Spring brings a slow warm-up, with water temperatures commonly sitting between 13–16°C, depending on weather and wind.