Portland (ME) water temp
This data the coastal Portland ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in Portland
Water temperature in Portland today is 61.2°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Portland was recorded in 2023 and was 65.3°F, and the coldest was recorded in 2007 at 57.6°F. Sea water temperature in Portland is expected to drop to 59.4°F in the next 10 days. September average water temperature in Portland is 60.8°F, the minimum temperature is 56.3°F, and the maximum is 67.5°F.
Throughout the year, the water temperature in Portland does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Portland in winter reaches 41.7°F, in spring 43.2°F, in summer the average temperature rises to 61.2°F, and in autumn it is 55.4°F.
Portland water temperature now
| September 14, 2025 |
|---|
| today temp |
| 61.2°F |
| September 13, 2025 |
|---|
| yesterday temp |
| 61.3°F |
The ocean salinity in Portland is 30.11‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Portland for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Portland. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Portland. Data in table shown for September 15, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 2' 6" | 2' 6" | 2' 4" | 2' 0" |
| 0.76 m | 0.76 m | 0.7 m | 0.62 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 10" | 1' 7" | 1' 6" | 1' 5" |
| 0.55 m | 0.49 m | 0.46 m | 0.44 m |
Surf report in Portland
Portland weather forecast
Current temperature and weather
Data in a table show Portland temperature today (September 15, 2025). For more information and forecast for a few days, go to the weather forecast Portland.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | |  | |
| 61.7°F | 60.4°F | 58.3°F | 58.6°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 | | | |
| 61.7°F | 63.1°F | 63°F | 60.3°F |
You may also be interested in other sections of our site for Portland: Sunrise and Sunset, Tides
Portland water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Portland. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Portland on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 41.5°F | 36.7°F | 48°F | cold |
| Ocean water temperature in Portland in January | ||||
| February | 38.7°F | 34.2°F | 42.4°F | cold |
| Ocean water temperature in Portland in February | ||||
| March | 38.7°F | 34.5°F | 45.5°F | cold |
| Ocean water temperature in Portland in March | ||||
| April | 42.1°F | 36.7°F | 49.6°F | cold |
| Ocean water temperature in Portland in April | ||||
| May | 48.9°F | 42.4°F | 59.7°F | cold |
| Ocean water temperature in Portland in May | ||||
| June | 56.5°F | 48.9°F | 64.9°F | cold |
| Ocean water temperature in Portland in June | ||||
| July | 62.6°F | 54.1°F | 68.9°F | cold |
| Ocean water temperature in Portland in July | ||||
| August | 64.4°F | 59°F | 69.6°F | cold |
| Ocean water temperature in Portland in August | ||||
| September | 60.8°F | 56.3°F | 67.5°F | cold |
| Ocean water temperature in Portland in September | ||||
| October | 55.6°F | 50.2°F | 61.3°F | cold |
| Ocean water temperature in Portland in October | ||||
| November | 49.8°F | 44.8°F | 55.2°F | cold |
| Ocean water temperature in Portland in November | ||||
| December | 45°F | 39.9°F | 51.1°F | cold |
| Ocean water temperature in Portland in December | ||||
Chart monthly average water temperature in Portland
