Kiama – current water temperature and swimming conditions

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

According to our forecast, Sea water temperature in Kiama will be 17.8°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

Kiama sits on the Illawarra coast beside the Tasman Sea and experiences water temperatures that follow a clear seasonal cycle. In summer, the ocean usually warms to around 21–24 °C, which is comfortable for swimming, snorkelling, and spending longer periods in the water. Autumn often holds onto that warmth, with sea temperatures commonly ranging from 19–22 °C, while spring starts cooler at about 17–20 °C as conditions gradually improve. Winter brings the coldest water, typically around 16–18 °C, which can feel brisk but is still swimmable for short sessions, especially for locals or anyone wearing a wetsuit.