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 19°C.
Water Temperature in Terrigal 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 Terrigal 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 Terrigal Lagoon will be 18.4°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 |
|---|---|---|---|
| Apr 8 | 19.4°C | 18.3°C | |
| Apr 9 | 19.5°C | 18.3°C | |
| Apr 10 | 19.4°C | 18.3°C | |
| Apr 11 | 21.2°C | 18.3°C | |
| Apr 12 | 21.1°C | 18.3°C | |
| Apr 13 | 18.9°C | 18.3°C | |
| Apr 14 | 18.9°C | 18.3°C | |
| Apr 15 | 20.9°C | 18.3°C | |
| Apr 16 | 19.3°C | 18.3°C | 19.3°C |
| Apr 17 | 18.3°C | 19.2°C | |
| Apr 18 | 18.3°C | 19.1°C | |
| Apr 19 | 18.3°C | 18.9°C | |
| Apr 20 | 18.3°C | 18.8°C | |
| Apr 21 | 18.3°C | 18.7°C | |
| Apr 22 | 18.3°C | 18.6°C | |
| Apr 23 | 18.3°C | 18.4°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.