Perth Sea Temperature

Looking to find out what the sea water temperature in Perth is for today and the next few days? Below are data and charts that will give you information about sea temperatures in Perth and nearby locations.

Water temperature in Perth right now

Below is the current sea temperature for Perth, Australia on 13th July 2025.

19.4° C

(66.91° F)

  • yesterday: 19.43° C (66.97° F)
  • a week ago: 19.52° C (67.14° F)

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

The average sea temperature for Perth on July 13th over the last 10 years is 19.94° C (67.89° F), with a low temperature of 18.86° C (65.95° F) and a high of 21.43° C (70.57° F).

Analysis and forecast for Perth water temperatures

The water temperature in Perth today is lower than the average temperature of 19.94° C (67.89° F) and the temperature on this day last year, 13th July 2024, was 19.41° C (66.94° F).

The chart and table below shows the change in water temperature in Perth over the last 30 days:

Date Temperature (Celsius) Temperature (Fahrenheit)
July 13 19.4° C 66.91° F
July 12 19.43° C 66.97° F
July 10 19.25° C 66.65° F
July 9 19.3° C 66.74° F
July 8 19.79° C 67.62° F
July 7 19.73° C 67.51° F
July 6 19.52° C 67.14° F
July 5 19.79° C 67.62° F
July 4 19.77° C 67.59° F
July 3 20.06° C 68.11° F
July 2 20.23° C 68.41° F
July 1 20.33° C 68.59° F
June 30 19.97° C 67.95° F
June 29 20.03° C 68.05° F
June 28 20.22° C 68.4° F
June 27 20.36° C 68.65° F
June 26 20.18° C 68.32° F
June 25 20.23° C 68.41° F
June 24 20.43° C 68.77° F
June 23 20.69° C 69.24° F
June 22 21.03° C 69.85° F
June 21 21.34° C 70.41° F
June 20 21.61° C 70.9° F
June 19 21.66° C 70.99° F
June 18 21.42° C 70.56° F
June 17 21.25° C 70.25° F
June 16 21.01° C 69.82° F
June 15 21.06° C 69.91° F
June 14 21.01° C 69.82° F
June 13 20.99° C 69.78° F
June 12 21.07° C 69.93° F

The actual nearshore temperatures may vary by several degrees and this can also be heavily affected by weather. Strong winds can cause cold, deep waters to replace the surface waters that had been warmed by the sun, and heavy rain can also reduce the temperature of the sea surface temperature as well.

Water temperature in Perth by month

The chart below shows the monthly average water temperature in Perth.

For more detailed information on how the sea temperature in Perth changes for each month of the year, choose from the months below.

Perth map and nearby water temperatures

Locations near Perth

The highest temperature in Australia today is 26.59° C (79.86° F) in Weipa. The lowest is in Port Phillip Bay, where the temperature of the water is 11.15° C (52.06° F).

Why measure sea surface temperatures (SST) in Perth?

The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as Perth because they want to understand and learn how the ocean communicates with the atomosphere of Earth.

SST is one measure that provides information on the global climate, and it can be used to predict the weather in Perth as well as atmospheric model simulations and to study marine ecosystems in the area.

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Perth comes from the National Oceanic and Atmospheric Administration (NOAA) and their 1/4° daily Optimum Interpolation Sea Surface Temperature.

The water temperature data is constructed by combining observations from different platforms (satellites, ships, buoys, and Argo floats) on a regular global grid. A spatially complete sea surface temperature map is then built by interpolating to fill in gaps in the data.

If you'd like to use any of the information above in the format it is presented, please use the citation tool below.

  • "Perth Sea Temperature". SeaTemperatures.net. Accessed on July 13, 2025. http://seatemperatures.net/australia-and-oceania/australia/perth/.

  • "Perth Sea Temperature". SeaTemperatures.net, http://seatemperatures.net/australia-and-oceania/australia/perth/. Accessed 13 July, 2025

  • Perth Sea Temperature. SeaTemperatures.net. Retrieved from http://seatemperatures.net/australia-and-oceania/australia/perth/.