Terrigal Lagoon – current water temperature and swimming conditions
This page provides information about the current water temperature at Terrigal 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 Terrigal Lagoon today is 14°C.
Water Temperature in Terrigal 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 Terrigal Lagoon have been on a steady rise over the past month and have continued to climb over the last week.
According to our forecast, the water temperature in Terrigal Lagoon will be 11.6°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 |
|---|---|---|---|
| Aug 15 | 13.8°C | 11.3°C | |
| Aug 16 | 14.0°C | 11.3°C | |
| Aug 17 | 13.9°C | 11.3°C | |
| Aug 18 | 13.9°C | 11.3°C | |
| Aug 19 | 13.9°C | 11.3°C | |
| Aug 20 | 14.0°C | 11.3°C | |
| Aug 21 | 14.0°C | 11.3°C | |
| Aug 22 | 14.0°C | 11.3°C | |
| Aug 23 | 14.0°C | 11.3°C | 14.0°C |
| Aug 24 | 11.3°C | 13.7°C | |
| Aug 25 | 11.3°C | 13.3°C | |
| Aug 26 | 11.3°C | 13.0°C | |
| Aug 27 | 11.3°C | 12.7°C | |
| Aug 28 | 11.3°C | 12.3°C | |
| Aug 29 | 11.3°C | 12.0°C | |
| Aug 30 | 11.3°C | 11.6°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 | 18°C | 23°C | 28°C |
| February | 18°C | 22°C | 27°C |
| March | 17°C | 21°C | 26°C |
| April | 14°C | 18°C | 25°C |
| May | 11°C | 15°C | 21°C |
| June | 10°C | 13°C | 16°C |
| July | 9°C | 11°C | 13°C |
| August | 9°C | 11°C | 14°C |
| September | 11°C | 14°C | 19°C |
| October | 13°C | 17°C | 22°C |
| November | 15°C | 19°C | 26°C |
| December | 17°C | 21°C | 28°C |
Location & Local Information
Terrigal Lagoon sits just behind the beach and is a shallow coastal lagoon shaped by rainfall, sunshine, and seasonal weather rather than open-ocean conditions. Water temperatures vary through the year and can change quickly because the lagoon is shallow. In summer, the water typically warms to around 22–26°C, sometimes feeling quite warm on still, sunny days. Spring and autumn usually sit between 18–22°C, which can be comfortable when the weather is settled. During winter, temperatures often drop to about 14–17°C, making the water feel cool, especially in shaded sections or after cold nights.
Swimming Conditions
Swimming in Terrigal Lagoon is generally not recommended. While the water temperature in summer may appear suitable, the lagoon is not managed as a designated swimming area and water quality can be inconsistent. Urban runoff, limited water circulation, and occasional algal growth can affect clarity and safety, particularly after rainfall. Following heavy rain, conditions often deteriorate further, with cooler water and reduced quality. For these reasons, locals usually choose the nearby ocean beach or rock pools for swimming instead. Overall, Terrigal Lagoon is better appreciated as a scenic and natural feature of the area, with its seasonal water temperatures noted, but with swimming best avoided in favour of safer, managed coastal options nearby.