Water temperature in Onslow

This data the coastal Onslow 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 Onslow

Water temperature in Onslow today is 21.8°C. Based on our historical data over a period of ten years, the warmest water in this day in the Indian Ocean near Onslow was recorded in 2014 and was 23.7°C, and the coldest was recorded in 2018 at 20.2°C. Sea water temperature in Onslow is expected to rise to 22.6°C in the next 10 days. September average water temperature in Onslow is 22.6°C, the minimum temperature is 20.2°C, and the maximum is 25.1°C.

The swimming season in Onslow lasts from January to December, twelve months per year! During those months, Onslow water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Onslow in winter reaches 22°C, in spring 24.1°C, in summer the average temperature rises to 28.5°C, and in autumn it is 27.6°C.

Onslow water temperature now

The ocean salinity in Onslow is 31.98‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Onslow 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 Onslow. 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 Onslow. 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 Onslow

Onslow weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
21°C	20.1°C	19.5°C	21.8°C

12-15 h	15-18 h	18-21 h	21-24 h
23.4°C	23.3°C	22.1°C	21.7°C

Onslow water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Onslow. 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 Onslow 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 Onslow

The nearest beaches and cities from Onslow 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
Exmouth	22.4°C	23°C		0.36 m
Barrow Island	23.8°C	23°C		1.1 m
Turquoise Bay	23.8°C	23°C		1.94 m
Ningaloo Reef	23°C	23°C		2.2 m
Dampier	22.9°C	25°C		0.74 m
Coral Bay	22.9°C	23°C		2.32 m
Karratha	23.2°C	25°C		0.64 m
Port Walcott	22.9°C	25°C		0.45 m
Point Samson	22.8°C	25°C		0.43 m
Carnarvon	20°C	21°C		1.37 m

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Our report for Onslow 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.