All data are in degrees Fahrenheit


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



July 14, 04:57











Day Length:

16 h. 3 min.

Portland in July







Sea water temperature in Portland today

As of now, in Portland, the water temperature is 61.6°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is about the same as 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 rise a bit.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. 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 63.2°F on 2018, while the historical minimum was 60.0°F on 2016.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 62.2°F, with minimum temperature starting at 61.8°F, while the maximum might reach 62.6°F.

Daily water temperature in Portland

Date Current Year

actual* / forecast**

last year 10 years average
Jun 30 60.8°F 61.6°F 60.1°F
Jul 1 60.7°F 61.3°F 60.2°F
Jul 2 60.7°F 62.1°F 60.4°F
Jul 3 60.6°F 61.9°F 60.5°F
Jul 4 61.0°F 62.0°F 60.6°F
Jul 5 61.4°F 61.9°F 60.7°F
Jul 6 61.2°F 61.9°F 60.7°F
Jul 7 61.1°F 61.5°F 60.8°F
Jul 8 61.2°F 61.7°F 61.0°F
Jul 9 61.2°F 61.5°F 61.2°F
Jul 10 61.1°F 62.1°F 61.3°F
Jul 11 61.3°F 62.0°F 61.5°F
Jul 12 61.3°F 62.1°F 61.6°F
Jul 13 61.6°F 62.0°F 61.7°F
Jul 14 61.6°F 62.3°F 61.8°F
Jul 15 61.8°F 62.3°F 62.0°F
Jul 16 61.9°F 62.0°F 62.0°F
Jul 17 62.1°F 62.2°F 62.3°F
Jul 18 62.2°F 62.3°F 62.3°F
Jul 19 62.3°F 61.7°F 62.5°F
Jul 20 62.5°F 62.7°F 62.7°F
Jul 21 62.6°F 62.6°F 62.7°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

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 63.9°F 62mi
Barry 63.1°F 68mi
Cardiff 62.9°F 71mi
Cherbourg-Octeville 61.5°F 74mi

* current water temperature in this city

** straight line distance from Portland