Portland – current water temperature and swimming conditions

Water Temperature in Portland: 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 Portland 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 Portland will be 18.0°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

Portland sits on Victoria’s far western coastline, looking out over the Great Australian Bight, and its water temperatures reflect this exposed southern ocean setting. In summer, the sea is usually at its warmest, generally ranging from about 17–20°C, which feels cool but refreshing on warm days. Autumn brings a steady drop to roughly 15–18°C, while winter is noticeably cold, often around 12–14°C. Spring sees a gradual warm-up, with water temperatures commonly sitting between 13–16°C, though conditions can shift quickly with changes in wind and swell.