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Water temperature in Portland

Detailed information about the current water temperature in Portland. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Portland now

51.7

°F

December 21, 16:48

Trend:

stable

Yesterday:

52.1°F

Tomorrow:

51.7°F

Sunrise:

08:09

Sunset:

16:08

Day Length:

7 h. 59 min.

Portland in December

Minimum:

48.6°F

Average:

49.9°F

Maximum:

51.0°F

Sea water temperature in Portland today

As of now, in Portland, the water temperature is 51.7°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 0.2°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 53.6°F on 2015, while the historical minimum was 50.5°F on 2022.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 51.5°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Portland

Date Current Year

actual* / forecast**

 last year 10 years average
Dec 7 54.5°F 52.6°F 53.3°F
Dec 8 54.4°F 51.8°F 53.1°F
Dec 9 54.2°F 52.0°F 52.9°F
Dec 10 53.8°F 52.2°F 52.7°F
Dec 11 53.6°F 52.3°F 52.5°F
Dec 12 53.4°F 52.0°F 52.4°F
Dec 13 53.2°F 51.9°F 52.3°F
Dec 14 53.0°F 51.9°F 52.1°F
Dec 15 52.7°F 51.7°F 52.0°F
Dec 16 51.3°F 50.9°F 51.6°F
Dec 17 52.2°F 50.3°F 51.5°F
Dec 18 51.9°F 50.6°F 51.6°F
Dec 19 52.3°F 50.6°F 51.6°F
Dec 20 52.1°F 50.7°F 51.6°F
Dec 21 51.7°F 50.5°F 51.5°F
Dec 22 51.7°F 51.0°F 51.5°F
Dec 23 51.7°F 51.4°F 51.5°F
Dec 24 51.6°F 51.1°F 51.4°F
Dec 25 51.4°F 51.1°F 51.2°F
Dec 26 51.4°F 51.1°F 51.2°F
Dec 27 51.4°F 51.0°F 51.1°F
Dec 28 51.3°F 51.7°F 51.1°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Portland by month

January

February

March

April

May

June

July

August

September

October

November

December

In an average year, Portland offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Portland was recorded on September 3, 2022, reaching a 67.0°F. While the coldest temperature occurred on March 5, 2018, dipping to 43.9°F. The average readings by season are 49.8°F in Winter, 50.1°F in Spring, 61.3°F in Summer, and 60.3°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Bristol 46.4°F 62mi
Barry 47.7°F 68mi
Cardiff 47.1°F 71mi
Cherbourg-Octeville 53.0°F 74mi

* current water temperature in this city

** straight line distance from Portland