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 24°C.
Water Temperature in Terrigal Lagoon: Daily Trends, Historical Records, and Forecast
✅ Lake water between 20 and 25°C offers very comfortable swimming conditions for most people. Combined with warm air temperatures and calm weather, this range is ideal for extended swims and family activities. Because lakes lack strong currents, the water often feels gentler and warmer than rivers. Even with light cloud cover, swimming remains enjoyable.
Water Temperature Over the Last 30 Days
While water temperatures in Terrigal Lagoon declined overall during the past month, they have shown a noticeable rebound over the last week.
According to our forecast, the water temperature in Terrigal Lagoon will be 21.4°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 | 24.6°C | 21.0°C | |
| Mar 13 | 24.6°C | 21.0°C | |
| Mar 14 | 22.0°C | 21.0°C | |
| Mar 15 | 22.0°C | 21.0°C | |
| Mar 16 | 21.9°C | 21.0°C | |
| Mar 17 | 21.9°C | 21.0°C | |
| Mar 18 | 24.2°C | 21.0°C | |
| Mar 19 | 24.4°C | 21.0°C | |
| Mar 20 | 24.4°C | 21.0°C | 24.4°C |
| Mar 21 | 21.0°C | 24.0°C | |
| Mar 22 | 21.0°C | 23.6°C | |
| Mar 23 | 21.0°C | 23.1°C | |
| Mar 24 | 21.0°C | 22.7°C | |
| Mar 25 | 21.0°C | 22.3°C | |
| Mar 26 | 21.0°C | 21.9°C | |
| Mar 27 | 21.0°C | 21.4°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.