Blenheim Beach – current water temperature and swimming conditions

Water Temperature in Blenheim Beach: 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

While water temperatures in Blenheim Beach declined overall during the past month, they have shown a noticeable rebound over the last week.

According to our forecast, Sea water temperature in Blenheim Beach will be 17.9°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

Blenheim Beach sits just south of Vincentia within Jervis Bay on the South Coast of New South Wales, and its water temperatures follow a gentle, predictable seasonal pattern. In summer, the water typically warms to around 21–24 °C, making it comfortable for long swims and floating close to shore. Autumn often remains pleasant, with temperatures commonly between 19–22 °C, while spring is cooler at roughly 17–20 °C as the bay gradually heats up after winter. During winter, water temperatures usually fall to about 16–18 °C, which can feel cool but is still manageable for short swims, particularly on calm, sunny days.