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, United States on 28th March 2024.

9.19° C

(48.54° F)

  • yesterday: 9.04° C (48.27° F)
  • a week ago: 10.84° C (51.51° F)

This water is very cold and can cause pain. We don't recommend you swim in this temperature for anything other than very short swims of 5 to 10 minutes unless you are a very experienced cold water swimmer.

The average sea temperature for Portland on March 28th over the last 10 years is 9.87° C (49.77° F), with a low temperature of 8.39° C (47.1° F) and a high of 11.92° C (53.46° F).

Analysis and forecast for Portland water temperatures

The water temperature in Portland today is lower than the average temperature of 9.87° C (49.77° F) and the temperature on this day last year, 28th March 2023, was 9° C (48.2° 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 28 9.19° C 48.54° F
March 27 9.04° C 48.27° F
March 26 11.3° C 52.34° F
March 25 11.22° C 52.2° F
March 24 11.27° C 52.29° F
March 23 11.24° C 52.23° F
March 22 11.09° C 51.96° F
March 21 10.84° C 51.51° F
March 20 10.9° C 51.62° F
March 19 10.87° C 51.57° F
March 18 11.12° C 52.02° F
March 17 11.11° C 52° F
March 16 11.51° C 52.72° F
March 15 10.97° C 51.75° F
March 14 10.74° C 51.33° F
March 13 10.56° C 51.01° F
March 12 10.4° C 50.72° F
March 11 10.46° C 50.83° F
March 10 10.4° C 50.72° F
March 9 10.27° C 50.49° F
March 8 9.99° C 49.98° F
March 7 9.9° C 49.82° F
March 6 10.04° C 50.07° F
March 5 10.1° C 50.18° F
March 4 10.24° C 50.43° F
March 3 10.52° C 50.94° F
March 2 10.66° C 51.19° F
March 1 10.81° C 51.46° F
February 29 10.69° C 51.24° F
February 28 10.7° C 51.26° F
February 27 10.78° C 51.4° 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.

Portland map and nearby water temperatures

The highest temperature in United States today is 25.38° C (77.68° F) in Boynton Beach. The lowest is in Anchorage, where the temperature of the water is -1.45° C (29.39° 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.

  • "Portland Sea Temperature". SeaTemperatures.net. Accessed on March 28, 2024. http://seatemperatures.net/north-america/united-states/portland/.

  • "Portland Sea Temperature". SeaTemperatures.net, http://seatemperatures.net/north-america/united-states/portland/. Accessed 28 March, 2024

  • Portland Sea Temperature. SeaTemperatures.net. Retrieved from http://seatemperatures.net/north-america/united-states/portland/.