Clontarf — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Clontarf (Australia). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Clontarf help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Clontarf in the Tasman Sea today is 20°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Water temperature in Clontarf today is lower than both a week ago and a month ago. Currently, the sea water at this location is slightly warmer than average for this day in previous years.
According to our forecast, Water temperature in Clontarf will be 20.1°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 1 | 21.5°C | 20.5°C | |
| JUN 2 | 21.5°C | 20.3°C | |
| JUN 3 | 21.5°C | 20.8°C | |
| JUN 4 | 21.2°C | 20.0°C | |
| JUN 5 | 21.1°C | 20.3°C | |
| JUN 6 | 20.9°C | 20.0°C | |
| JUN 7 | 20.6°C | 19.8°C | |
| JUN 8 | 20.7°C | 19.3°C | |
| JUN 9 | 20.4°C | 19.3°C | 20.4°C |
| JUN 10 | 19.3°C | 20.4°C | |
| JUN 11 | 19.5°C | 20.3°C | |
| JUN 12 | 19.3°C | 20.3°C | |
| JUN 13 | 19.5°C | 20.2°C | |
| JUN 14 | 19.8°C | 20.2°C | |
| JUN 15 | 20.0°C | 20.2°C | |
| JUN 16 | 20.0°C | 20.1°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Clontarf, on the northern shores of Middle Harbour in New South Wales, is a sheltered coastal suburb where water temperatures follow the broader Sydney harbour pattern but are often slightly moderated by the enclosed bay and tidal flows. Typical seasonal water temperatures are: summer (December–February) 20–24°C, autumn (March–May) 18–22°C, winter (June–August) 16–18°C and spring (September–November) 18–22°C. Because the area is protected from the full force of the open ocean, temperatures can feel a little warmer in calm weather and on sunny days, while strong southerly winds or heavy rain can lower local water temperature and visibility for short periods.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 20°C | 23°C | 25°C |
| February | 22°C | 24°C | 27°C |
| March | 20°C | 23°C | 26°C |
| April | 19°C | 23°C | 25°C |
| May | 16°C | 21°C | 24°C |
| June | 15°C | 20°C | 22°C |
| July | 15°C | 19°C | 21°C |
| August | 16°C | 18°C | 20°C |
| September | 16°C | 18°C | 20°C |
| October | 16°C | 19°C | 21°C |
| November | 18°C | 20°C | 22°C |
| December | 19°C | 21°C | 25°C |
* Click on a month to view detailed water temperature data.
Clontarf: Weather Forecast
June 10
June 11
June 12
Location, Beaches & Local Information
Nearby Beaches & Facilities
Chinamans Beach
Edwards Beach
Clontarf Beach
Forty Baskets Beach
Chinamans Beach
Cobblers Beach
Obelisk Beach
Cabblers Beach
Balmoral Beach
Swimming Conditions
Swimming around Clontarf is popular for families and casual beachgoers thanks to small sandy bays, rock platforms and sheltered coves that provide gentle conditions for wading, snorkelling, paddleboarding and kayaking. The lack of significant surf makes the area suitable for less experienced swimmers, though boat traffic in parts of Middle Harbour means caution is advisable. Summer and early autumn, when water temperatures are generally 20–24°C, are the most comfortable times for extended swims and water-based recreation; in winter, when water sits around 16–18°C, many visitors prefer shorter dips or wear a wetsuit for comfort. Facilities such as picnic spots, foreshore paths and nearby cafes make Clontarf a convenient choice for a relaxed beach holiday focused on harbour swimming and calm-water activities.