Water temperature in Rathmines

This data the coastal Rathmines ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current ocean temperature in Rathmines

Water temperature in Rathmines today is 17.8°C. Based on our historical data over a period of ten years, the warmest water in this day in the Tasman Sea near Rathmines was recorded in 2023 and was 18.5°C, and the coldest was recorded in 2018 at 16.8°C. Sea water temperature in Rathmines is expected to rise to 17.9°C in the next 10 days. September average water temperature in Rathmines is 18°C, the minimum temperature is 16.4°C, and the maximum is 20.6°C.

The swimming season in Rathmines lasts from November to May. During those months, Rathmines water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Rathmines in winter reaches 18.2°C, in spring 19.2°C, in summer the average temperature rises to 22.8°C, and in autumn it is 22.1°C.

Rathmines water temperature now

The ocean salinity in Rathmines is 35.26‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Rathmines for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Rathmines. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Rathmines. Data in table shown for 5 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Rathmines

Rathmines weather forecast

Current temperature and weather

Data in a table show Rathmines temperature today (5 September 2025). For more information and forecast for a few days, go to the weather forecast Rathmines.

0-3 h	3-6 h	6-9 h	9-12 h
12.6°C	13.1°C	11.7°C	15.5°C

12-15 h	15-18 h	18-21 h	21-24 h
17.8°C	16.9°C	15°C	15.4°C

Rathmines water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Rathmines. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Rathmines on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Rathmines

The nearest beaches and cities from Rathmines with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Blacksmiths Beach	17.8°C	17°C		1.27 m
Caves Beach	17.8°C	17°C		1.27 m
Catherine Hill Bay	17.9°C	17°C		1.27 m
Redhead Beach	17.9°C	17°C		1.61 m
Budgewoi	17.6°C	16°C		1.27 m
Merewether	17.8°C	17°C		1.43 m
Norah Head	17.5°C	16°C		1.79 m
Soldiers Beach	17.5°C	16°C		1.79 m
Gorokan	17.2°C	16°C		1.54 m
Stockton	17.8°C	17°C		0.98 m

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Our report for Rathmines is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.