Glenbrook Lagoon – current water temperature and swimming conditions
This page provides information about the current water temperature at Glenbrook Lagoon 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 Glenbrook Lagoon today is 18°C.
Water Temperature in Glenbrook Lagoon: 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 Glenbrook Lagoon 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 Glenbrook Lagoon will be 18.8°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 8 | 20.4°C | 19.0°C | |
| Apr 9 | 20.5°C | 19.0°C | |
| Apr 10 | 20.5°C | 19.0°C | |
| Apr 11 | 20.2°C | 19.0°C | |
| Apr 12 | 20.2°C | 19.0°C | |
| Apr 13 | 18.1°C | 19.0°C | |
| Apr 14 | 18.0°C | 19.0°C | |
| Apr 15 | 17.6°C | 19.0°C | |
| Apr 16 | 17.6°C | 19.0°C | 17.6°C |
| Apr 17 | 19.0°C | 17.8°C | |
| Apr 18 | 19.0°C | 18.0°C | |
| Apr 19 | 19.0°C | 18.1°C | |
| Apr 20 | 19.0°C | 18.3°C | |
| Apr 21 | 19.0°C | 18.5°C | |
| Apr 22 | 19.0°C | 18.7°C | |
| Apr 23 | 19.0°C | 18.8°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 | 19°C | 24°C | 29°C |
| February | 19°C | 24°C | 27°C |
| March | 18°C | 23°C | 26°C |
| April | 12°C | 19°C | 23°C |
| May | 12°C | 16°C | 20°C |
| June | 11°C | 13°C | 15°C |
| July | 10°C | 12°C | 14°C |
| August | 11°C | 13°C | 16°C |
| September | 13°C | 17°C | 19°C |
| October | 16°C | 20°C | 26°C |
| November | 16°C | 22°C | 27°C |
| December | 19°C | 23°C | 27°C |
Location & Local Information
Glenbrook Lagoon is a serene pocket of water tucked away in the lower Blue Mountains, offering a peaceful escape from the suburban buzz of Glenbrook. If you’re keeping an eye on the water temperature, it generally follows the local mountain weather, warming up to a balmy 23°C to 26°C during the height of summer. In the cooler months, the mercury takes a proper dive, often sitting between a brisk 10°C and 13°C. Because it’s a relatively shallow, standing body of water, it tends to hold the heat on those stinking hot days, but it can get quite fresh once the sun drops behind the ridges.
Swimming Conditions
Now, while the lagoon looks like a ripper spot for a splash, swimming is generally not recommended by the local council. The main reason is the water quality; since the lagoon acts as a catchment for stormwater runoff from the surrounding houses and roads, it can carry high levels of bacteria and nutrients that aren't great for your health. There’s also the issue of aquatic weeds like Cabomba, which create thick underwater mats that can be a real hazard for entanglement. If you’re dead set on a dip, most of the locals head just down the road to Jellybean Pool or Blue Pool in the National Park, where the water is clearer and the flow is better. As it stands, the lagoon is a better spot for a sunset stroll or a bit of birdwatching than a head-first dive.