Portland Sea Temperature

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

Water temperature in Portland right now

Below is the current sea temperature for Portland, Australia on 25th March 2025.

17.85° C

(64.14° F)

yesterday: 17.8° C (64.05° F)
a week ago: 18.86° C (65.95° 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 Portland on March 25th over the last 10 years is 17.41° C (63.33° F), with a low temperature of 16.48° C (61.66° F) and a high of 18.28° C (64.9° F).

Analysis and forecast for Portland water temperatures

The water temperature in Portland today is higher than the average temperature of 17.41° C (63.33° F) and the temperature on this day last year, 25th March 2024, was 17.85° C (64.13° F).

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

Date	Temperature (Celsius)	Temperature (Fahrenheit)
March 25	17.85° C	64.14° F
March 24	17.8° C	64.05° F
March 23	18.3° C	64.94° F
March 22	18.37° C	65.07° F
March 21	18.39° C	65.1° F
March 20	18.72° C	65.7° F
March 19	19.15° C	66.47° F
March 18	18.86° C	65.95° F
March 17	19.13° C	66.43° F
March 16	19.51° C	67.12° F
March 15	19.77° C	67.59° F
March 14	19.82° C	67.68° F
March 13	19.36° C	66.85° F
March 12	19.4° C	66.92° F
March 11	19.6° C	67.28° F
March 10	19.83° C	67.69° F
March 9	19.54° C	67.17° F
March 8	19.13° C	66.43° F
March 7	18.78° C	65.8° F
March 6	18.67° C	65.61° F
March 5	18.99° C	66.18° F
March 4	19.05° C	66.29° F
March 3	18.92° C	66.06° F
March 2	18.81° C	65.86° F
March 1	18.87° C	65.97° F
February 28	18.91° C	66.04° F
February 27	18.86° C	65.95° F
February 26	18.75° C	65.75° F
February 25	18.79° C	65.82° F
February 24	18.78° C	65.8° F
February 23	18.91° C	66.04° 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 Portland by month

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

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

January February March April May June July August September October November December

Portland map and nearby water temperatures

The highest temperature in Australia today is 30.81° C (87.47° F) in Port Hedland. The lowest is in Coffin Bay, where the temperature of the water is 16.24° C (61.24° F).

Why measure sea surface temperatures (SST) in Portland?

The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as Portland 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 Portland 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 Portland 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.

<a href="http://seatemperatures.net/australia-and-oceania/australia/portland/">Portland Sea Temperature</a>
"Portland Sea Temperature". SeaTemperatures.net. Accessed on March 25, 2025. http://seatemperatures.net/australia-and-oceania/australia/portland/.
"Portland Sea Temperature". SeaTemperatures.net, http://seatemperatures.net/australia-and-oceania/australia/portland/. Accessed 25 March, 2025
Portland Sea Temperature. SeaTemperatures.net. Retrieved from http://seatemperatures.net/australia-and-oceania/australia/portland/.