Water temperature in Lake Illawarra (NSW) in May

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Is it warm enough to swim in Lake Illawarra in May? Average water temperature in Lake Illawarra in May is 20.5°C and therefore suitable for comfortable swimming. The warmest sea in Lake Illawarra in May is 22.8°C, and the coldest is 18°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Lake Illawarra

Changes water temperature in Lake Illawarra in May 2025, 2024

To get an accurate forecast for the water temperature in Lake Illawarra for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Lake Illawarra, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 May	21.5°C	21°C	19.5°C	22.8°C
2 May	21.8°C	21°C	19.8°C	22.6°C
3 May	21.9°C	20.9°C	19.7°C	22.3°C
4 May	21.7°C	20.9°C	18.4°C	22.7°C
5 May	21.4°C	21.2°C	19°C	22.7°C
6 May	21.5°C	21.2°C	19.3°C	22.7°C
7 May	21.3°C	21.4°C	19.2°C	22.5°C
8 May	21.5°C	21.3°C	19°C	22.4°C
9 May	21.7°C	21.1°C	18.5°C	22.8°C
10 May	21.6°C	21.1°C	18.8°C	22.8°C
11 May	21.3°C	21.2°C	18.9°C	22.3°C
12 May	21.4°C	20.8°C	19.1°C	22.3°C
13 May	21.4°C	20.3°C	19.1°C	22.1°C
14 May	21.4°C	20°C	19°C	22.8°C
15 May	21.3°C	20.4°C	19°C	22.7°C

Day	2025	2024	Min	Max
16 May	21.2°C	20.4°C	19°C	22.6°C
17 May	21.2°C	20.3°C	19°C	22.6°C
18 May	21.1°C	20.3°C	19°C	22.7°C
19 May	21.2°C	19.6°C	19°C	22.3°C
20 May	21.1°C	19.7°C	19°C	22.5°C
21 May	21.1°C	20.1°C	18.9°C	22.1°C
22 May	21°C	19.6°C	18.7°C	22°C
23 May	20.3°C	19.6°C	18.7°C	22°C
24 May	20.4°C	19.6°C	18.6°C	22°C
25 May	20.2°C	20°C	18.3°C	22.1°C
26 May	20.1°C	20.2°C	18.5°C	21.7°C
27 May	20°C	20°C	18.4°C	21.4°C
28 May	19.8°C	19.6°C	18.4°C	21.7°C
29 May	19.7°C	20°C	18.2°C	21.7°C
30 May	19.6°C	19.9°C	18.3°C	20.9°C
31 May	19.6°C	19.4°C	18°C	21.2°C

Average water temperature in Lake Illawarra in May over a decade

2016	2017	2018	2019	2020
20.7°C	20.4°C	19.1°C	21.4°C	19.8°C

2021	2022	2023	2024	2025
19.9°C	21.5°C	20.4°C	20.4°C	21°C

Lake Illawarra sea state in May

Chart comparing the height of waves in Lake Illawarra in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Lake Illawarra water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Temperature in neighboring cities

The nearest locations with the average water temperature in May. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Shellharbour Village	20.6°C	17.9°C	23.2°C
Warilla	20.5°C	18.1°C	22.8°C
Port Kembla	20.6°C	18.2°C	23°C
Werri Beach	20.6°C	17.7°C	23.6°C
Wollongong	20.6°C	18.3°C	23.1°C
Bellambi	20.6°C	18.3°C	23.2°C
Gerroa	20.3°C	17.7°C	23.2°C
Thirroul	20.6°C	18.2°C	23.2°C
Bulli Beach	20.6°C	18.2°C	23.2°C
Woonona	20.6°C	18.2°C	23.2°C

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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.

Region

Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature