Glenrock Lagoon – current water temperature and swimming conditions
This page provides information about the current water temperature at Glenrock 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 Glenrock Lagoon today is 14°C.
Water Temperature in Glenrock Lagoon: Daily Trends, Historical Records, and Forecast
⚠️ Lake temperatures between 10 and 15°C are cold but can be manageable for short swims on sunny, warm days. Shallow areas may feel slightly warmer, while deeper sections remain cold and slow to warm up. Most swimmers keep sessions brief, and wetsuits are often used for comfort. Wind and cooler air temperatures can quickly reduce how pleasant the swim feels.
Water Temperature Over the Last 30 Days
Water temperatures in Glenrock 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 Glenrock Lagoon will be 13.8°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 |
|---|---|---|---|
| Jun 13 | 15.0°C | 13.8°C | |
| Jun 14 | 15.0°C | 13.8°C | |
| Jun 15 | 15.1°C | 13.8°C | |
| Jun 16 | 15.1°C | 13.8°C | |
| Jun 17 | 15.1°C | 13.8°C | |
| Jun 18 | 15.0°C | 13.8°C | |
| Jun 19 | 14.5°C | 13.8°C | |
| Jun 20 | 14.3°C | 13.8°C | |
| Jun 21 | 14.1°C | 13.8°C | 14.1°C |
| Jun 22 | 13.8°C | 14.1°C | |
| Jun 23 | 13.8°C | 14.0°C | |
| Jun 24 | 13.8°C | 14.0°C | |
| Jun 25 | 13.8°C | 13.9°C | |
| Jun 26 | 13.8°C | 13.9°C | |
| Jun 27 | 13.8°C | 13.8°C | |
| Jun 28 | 13.8°C | 13.8°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 | 20°C | 26°C | 28°C |
| February | 18°C | 24°C | 28°C |
| March | 16°C | 24°C | 27°C |
| April | 19°C | 21°C | 24°C |
| May | 15°C | 17°C | 20°C |
| June | 12°C | 14°C | 16°C |
| July | 12°C | 13°C | 15°C |
| August | 13°C | 14°C | 17°C |
| September | 16°C | 18°C | 19°C |
| October | 18°C | 21°C | 23°C |
| November | 21°C | 23°C | 25°C |
| December | 21°C | 25°C | 27°C |
Location & Local Information
Glenrock Lagoon lies within a bushland reserve just south of Newcastle and is a shallow coastal lagoon influenced by rainfall and local weather rather than the open ocean. Water temperatures change through the seasons and can fluctuate quickly. In summer, the lagoon typically warms to around 22–26°C, which can feel quite warm on still days. Spring and autumn usually sit in the 18–22°C range, while winter temperatures often drop to about 14–17°C. Because the lagoon is shallow and sheltered, sunshine and air temperature have a strong effect on how warm the water feels from day to day.
Swimming Conditions
Swimming in Glenrock Lagoon is generally not recommended. While the water temperature in summer may seem suitable, the lagoon is not managed as a swimming area and water quality can be inconsistent. Runoff after rain, limited water circulation, and natural organic matter can reduce clarity and increase health risks. Conditions tend to worsen following heavy rainfall, when the water can become murky and cooler. For these reasons, locals usually choose nearby ocean beaches or ocean baths for swimming instead. Overall, Glenrock Lagoon is best appreciated as a natural and scenic wetland, with its seasonal water temperatures noted, but its use better suited to walking, wildlife viewing, and enjoying the surrounding reserve rather than swimming.