Portland Sea Temperature in January

Looking to find out what the average sea water temperature in Portland is for January? Find out what the lowest, highest, and average water temperatures are for Portland over the past 10 years.

Average water temperature in Portland for January

The average, high, and low temperatures below should help you if you can swim in the water in Portland in January.

9.94° C

(49.88° F)

highest: 12.26° C (54.07° F)
lowest: 6.87° C (44.37° 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.

Water temperature range by day in January in Portland

The chart below shows the range of low and high temperatures by day for the month of January in Portland.

Water temperatures for January in Portland in recent years

Day	2024	2023	2022	2021
1	11.43° C	9.83° C	9.32° C	10° C
2	11.57° C	9.98° C	9.47° C	10.03° C
3	11.56° C	9.9° C	9.91° C	10.08° C
4	11.3° C	10.01° C	9.78° C	10.12° C
5	11.24° C	10.1° C	9.66° C	10.15° C
6	11.14° C	10.06° C	9.63° C	10.18° C
7	11.23° C	10.08° C	9.61° C	10.11° C
8	11.1° C	10.09° C	9.7° C	10.02° C
9	11.15° C	10.14° C	9.59° C	9.93° C
10	11.06° C	10.24° C	9.64° C	9.97° C
11	10.96° C	10.38° C	9.85° C	10.23° C
12	10.72° C	10.44° C	9.86° C	9.87° C
13	10.43° C	10.59° C	9.78° C	9.73° C
14	10.4° C	10.79° C	9.83° C	9.63° C
15	10.28° C	10.56° C	9.97° C	9.74° C
16	10.26° C	10.48° C	9.98° C	9.85° C
17	10.23° C	10.49° C	9.91° C	9.59° C
18	10.19° C	10.37° C	9.74° C	9.46° C
19	10.28° C	10.16° C	9.66° C	9.39° C
20	10.25° C	10.09° C	9.82° C	9.22° C
21	10.24° C	10.11° C	9.99° C	8.81° C
22	10.47° C	10.04° C	10.19° C	8.82° C
23	10.62° C	9.86° C	10.23° C	9.12° C
24	10.82° C	9.74° C	10.04° C	9.06° C
25	11.04° C	9.72° C	10.01° C	8.86° C
26	11.11° C	9.88° C	9.91° C	8.89° C
27	11.42° C	9.88° C	9.77° C	9.07° C
28	11.27° C	9.78° C	9.55° C	9.08° C
29	10.84° C	9.75° C	9.49° C	9.07° C
30	11.13° C	9.67° C	9.5° C	9.07° C
31	11.64° C	9.39° C	9.57° C	9.36° C

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/north-america/united-states/portland-january-temperature/">Portland Sea Temperature in January</a>
"Portland Sea Temperature in January". SeaTemperatures.net. Accessed on April 28, 2024. http://seatemperatures.net/north-america/united-states/portland-january-temperature/.
"Portland Sea Temperature in January". SeaTemperatures.net, http://seatemperatures.net/north-america/united-states/portland-january-temperature/. Accessed 28 April, 2024
Portland Sea Temperature in January. SeaTemperatures.net. Retrieved from http://seatemperatures.net/north-america/united-states/portland-january-temperature/.