St Georges Basin – current water temperature and swimming conditions
This page provides information about the current water temperature at St Georges Basin in New South Wales. Here you can view recent temperature trends on a 30-day chart, check typical monthly water temperature ranges, and compare today’s reading with historical averages for this date. A 7-day water temperature forecast, local weather conditions, and an overview of swimming suitability are also included.
Current Water Temperature
The water temperature in St Georges Basin today is 18°C.
Water Temperature in St Georges Basin: Daily Trends, Historical Records, and Forecast
⚠️ A lake temperature of 15 to 20°C is considered cool to comfortable for swimming in Australia. On warm days with light winds, this range allows for relaxed swimming, especially in shallow or sheltered areas. Comfort depends strongly on air temperature and sunshine, as cooler or overcast weather can still make the water feel chilly. This range is common during spring and early summer.
Water Temperature Over the Last 30 Days
Water temperatures in St Georges Basin have been gradually cooling over the past month, with a further drop recorded during the last week.
According to our forecast, the water temperature in St Georges Basin will be 15.6°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Water Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| Apr 28 | 17.7°C | 15.3°C | |
| Apr 29 | 17.8°C | 15.3°C | |
| Apr 30 | 18.2°C | 15.3°C | |
| May 1 | 18.2°C | 15.3°C | |
| May 2 | 18.0°C | 15.3°C | |
| May 3 | 18.0°C | 15.3°C | |
| May 4 | 17.9°C | 15.3°C | |
| May 5 | 18.0°C | 15.3°C | |
| May 6 | 17.9°C | 15.3°C | 17.9°C |
| May 7 | 15.3°C | 17.6°C | |
| May 8 | 15.3°C | 17.3°C | |
| May 9 | 15.3°C | 16.9°C | |
| May 10 | 15.3°C | 16.6°C | |
| May 11 | 15.3°C | 16.3°C | |
| May 12 | 15.3°C | 16.0°C | |
| May 13 | 15.3°C | 15.6°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual lake water temperatures may differ from the reported values by several degrees, particularly during periods of strong winds or rapid weather changes. Wind can mix surface and deeper layers in a lake, bringing cooler water to the surface, while shallow areas may warm more quickly under direct sunlight. Air temperature, sunshine, and cloud cover strongly influence how quickly a lake heats up or cools down. These factors can lead to noticeable temperature variations across different parts of the lake.
Our forecast is based on a proprietary mathematical model that considers real-time lake temperature observations, historical trends, seasonal cycles, wind strength and direction, and region-specific air temperature. To enhance accuracy, we also incorporate data from nearby monitored locations and comparable lakes within Australia.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Today | Yesterday | A Week Ago |
|---|---|---|---|
| January | 20°C | 24°C | 27°C |
| February | 19°C | 23°C | 28°C |
| March | 17°C | 21°C | 25°C |
| April | 14°C | 19°C | 22°C |
| May | 11°C | 15°C | 20°C |
| June | 9°C | 13°C | 16°C |
| July | 8°C | 11°C | 13°C |
| August | 10°C | 12°C | 14°C |
| September | 12°C | 15°C | 18°C |
| October | 15°C | 18°C | 22°C |
| November | 18°C | 20°C | 24°C |
| December | 20°C | 23°C | 26°C |
St Georges Basin: Water Temperature by Location
Erowal Bay
Wrights Beach
Paradise Beach Reserve
Location & Local Information
St Georges Basin is a large, sheltered coastal lagoon on the NSW South Coast, separated from the ocean and influenced mainly by local weather and seasonal conditions. Water temperatures here are generally moderate and stable through the year. In summer, the basin usually warms to around 22–26°C, which feels comfortably warm and ideal for swimming. Spring and autumn tend to sit between 18–22°C, remaining pleasant on clear days with light winds. During winter, water temperatures commonly drop to about 15–18°C, cool but still milder than many inland lakes and rivers further south.
Swimming Conditions
Swimming in St Georges Basin is allowed and widely enjoyed, especially during the warmer months. The water is typically calm, with minimal current and no wave action, making it well suited to relaxed swimming and paddling. Shallow shorelines and sandy edges provide easy access, which is popular with families and casual swimmers. Water quality is generally good in dry, settled weather, though it can be affected briefly after heavy rain when runoff reduces clarity and slightly cools the water. At those times, locals often wait for conditions to settle before swimming again. Overall, St Georges Basin offers reliable and comfortable swimming conditions, combining moderate water temperatures with a quiet, sheltered environment away from the open coast.