Water temperature in Lake Illawarra

This data the coastal Lake Illawarra ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current ocean temperature in Lake Illawarra

Water temperature in Lake Illawarra today is 18.8°C. Based on our historical data over a period of ten years, the warmest water in this day in Lake Illawarra was recorded in 2013 and was 19.2°C, and the coldest was recorded in 2009 at 16.5°C. Sea water temperature in Lake Illawarra is expected to drop to 18.1°C in the next 10 days. September average water temperature in Lake Illawarra is 17.3°C, the minimum temperature is 15.2°C, and the maximum is 19.5°C.

The swimming season in Lake Illawarra lasts from November to May. During those months, Lake Illawarra water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Lake Illawarra in winter reaches 17.9°C, in spring 18.5°C, in summer the average temperature rises to 22.2°C, and in autumn it is 21.7°C.

Lake Illawarra water temperature now

The ocean salinity in Lake Illawarra is 35.36‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Lake Illawarra for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Lake Illawarra. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Lake Illawarra. Data in table shown for 26 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Lake Illawarra

Lake Illawarra weather forecast

Current temperature and weather

Data in a table show Lake Illawarra temperature today (26 September 2025). For more information and forecast for a few days, go to the weather forecast Lake Illawarra.

0-3 h	3-6 h	6-9 h	9-12 h
12.3°C	12°C	11.9°C	17.5°C

12-15 h	15-18 h	18-21 h	21-24 h
20.6°C	20.9°C	18.1°C	16°C

Lake Illawarra water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Lake Illawarra. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Lake Illawarra on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Lake Illawarra

The nearest beaches and cities from Lake Illawarra with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Shellharbour Village	19°C	25°C		1 m
Warilla	18.7°C	25°C		0.79 m
Port Kembla	19°C	25°C		0.55 m
Werri Beach	19.2°C	25°C		0.81 m
Wollongong	19°C	25°C		0.55 m
Bellambi	18.9°C	25°C		0.66 m
Gerroa	18.5°C	24°C		0.79 m
Thirroul	18.8°C	25°C		0.66 m
Bulli Beach	18.8°C	25°C		0.66 m
Woonona	18.8°C	25°C		0.66 m

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Our report for Lake Illawarra is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.