Secret Harbour – current water temperature and swimming conditions

Water Temperature in Secret Harbour: 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 Secret Harbour declined overall during the past month, they have shown a noticeable rebound over the last week.

According to our forecast, Sea water temperature in Secret Harbour will be 18.4°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

Secret Harbour sits along Perth’s City Coast, facing the open Indian Ocean with a wide sandy beach and a well-known surf club overlooking the shoreline. Water temperatures here are typical of the Perth metro coast and suit swimming for much of the year. In summer, from December to February, the sea usually ranges between 20–23°C, feeling warm and refreshing on hot days. Autumn remains comfortable at around 18–21°C, while winter cools to roughly 16–18°C, which is brisk but still manageable for short swims. Spring brings a gradual warm-up again, generally sitting between 18–21°C as conditions become calmer.