Blue Lake – current water temperature and swimming conditions
This page provides information about the current water temperature at Blue Lake in South Australia. 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 Blue Lake today is 20°C.
Water Temperature in Blue Lake: 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
Over the past month, water temperatures in Blue Lake have stayed mostly steady, but a warming trend has developed over the last week.
According to our forecast, the water temperature in Blue Lake will be 17.2°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 |
|---|---|---|---|
| Mar 12 | 19.1°C | 16.8°C | |
| Mar 13 | 18.5°C | 16.8°C | |
| Mar 14 | 18.5°C | 16.8°C | |
| Mar 15 | 17.9°C | 16.8°C | |
| Mar 16 | 18.9°C | 16.8°C | |
| Mar 17 | 18.9°C | 16.8°C | |
| Mar 18 | 17.3°C | 16.8°C | |
| Mar 19 | 17.6°C | 16.8°C | |
| Mar 20 | 19.6°C | 16.8°C | 19.6°C |
| Mar 21 | 16.8°C | 19.3°C | |
| Mar 22 | 16.8°C | 18.9°C | |
| Mar 23 | 16.8°C | 18.6°C | |
| Mar 24 | 16.8°C | 18.2°C | |
| Mar 25 | 16.8°C | 17.9°C | |
| Mar 26 | 16.8°C | 17.5°C | |
| Mar 27 | 16.8°C | 17.2°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 | 14°C | 18°C | 24°C |
| February | 13°C | 18°C | 24°C |
| March | 13°C | 17°C | 21°C |
| April | 13°C | 15°C | 18°C |
| May | 11°C | 14°C | 16°C |
| June | 9°C | 13°C | 15°C |
| July | 9°C | 13°C | 15°C |
| August | 11°C | 14°C | 16°C |
| September | 11°C | 14°C | 16°C |
| October | 11°C | 15°C | 18°C |
| November | 11°C | 17°C | 21°C |
| December | 13°C | 18°C | 23°C |
Location & Local Information
The Blue Lake, known as Warwar by the Boandik people, is the crowning jewel of Mount Gambier, sitting right in the guts of a dormant volcanic crater. It’s famous for its mind-blowing colour shift, turning from a moody winter grey to a brilliant cobalt blue every November. If you’re talking water temperature, it’s a bit of a slow burner; during the peak of summer, the surface layers can warm up to around 20°C, which is largely what triggers that famous colour change. However, deeper down it stays a steady, brisk 14°C year-round. It’s a massive body of water—about 77 metres deep—so it holds its chill even when the South Aussie sun is absolutely cracking the flags.
Swimming Conditions
Now, as much as that crystal-clear blue water looks like the perfect spot for a splash, you’ve got to keep your boots on—swimming is strictly a no-go. The reason for the ban is pretty straightforward: the lake is the main drinking water supply for the whole of Mount Gambier, and they need to keep it pristine for the locals. If you’re dead set on a wild swim, you only have to head about ten minutes down the road to the Little Blue Lake. It’s a smaller sinkhole where swimming is absolutely allowed and very popular. It stays a refreshing 12°C all year, so it’ll give you a proper wake-up call, but it’s a ripper alternative since the big brother is off-limits.