Kurnell – current water temperature and swimming conditions

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

According to our forecast, Sea water temperature in Kurnell 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

Kurnell sits on the southern side of Botany Bay, where water conditions are shaped more by the enclosed bay than the open Tasman Sea. As a result, temperatures tend to be steady and follow Sydney’s familiar seasonal cycle. In summer, from December to March, water temperatures are usually around 21–24 °C, which most people find comfortable for regular swimming. Autumn brings a gradual drop to about 19–21 °C. Winter is the coolest period, typically sitting between 16–18 °C, while spring sees the water slowly warm again into the 18–20 °C range as air temperatures and sunshine increase.