Portsmouth (NC) water temp
This data the coastal Portsmouth 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 Portsmouth
Water temperature in Portsmouth today is 77.4°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Portsmouth was recorded in 2016 and was 80.4°F, and the coldest was recorded in 2008 at 73.8°F. Sea water temperature in Portsmouth is expected to drop to 75.9°F in the next 10 days. September average water temperature in Portsmouth is 79.5°F, the minimum temperature is 73.8°F, and the maximum is 84.7°F.
The swimming season in Portsmouth lasts from May to December. During those months, Portsmouth water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Portsmouth in winter reaches 63.7°F, in spring 66.4°F, in summer the average temperature rises to 80.2°F, and in autumn it is 74.5°F.
Portsmouth water temperature now
| September 26, 2025 |
|---|
| today temp |
| 77.4°F |
| September 25, 2025 |
|---|
| yesterday temp |
| 77°F |
The ocean salinity in Portsmouth is 35.35‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Portsmouth 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 Portsmouth. 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 Portsmouth. Data in table shown for September 26, 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 |
|---|---|---|---|
| 3' 1" | 3' 3" | 3' 2" | 3' 2" |
| 0.93 m | 0.98 m | 0.97 m | 0.96 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 3' 1" | 3' 2" | 3' 0" | 2' 9" |
| 0.95 m | 0.96 m | 0.92 m | 0.85 m |
Surf report in Portsmouth
Portsmouth weather forecast
Current temperature and weather
Data in a table show Portsmouth temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Portsmouth.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 76.3°F | 76.1°F | 76.1°F | 77.2°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 | | | |
| 78.4°F | 78.3°F | 77.5°F | 75.6°F |
You may also be interested in other sections of our site for Portsmouth: Sunrise and Sunset, Tides
Portsmouth water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Portsmouth. 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 Portsmouth 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 | 63.1°F | 53.8°F | 69.8°F | cold |
| Ocean water temperature in Portsmouth in January | ||||
| February | 61.7°F | 44.2°F | 68°F | cold |
| Ocean water temperature in Portsmouth in February | ||||
| March | 62.2°F | 51.3°F | 68.9°F | cold |
| Ocean water temperature in Portsmouth in March | ||||
| April | 65.5°F | 55.2°F | 73.8°F | cold |
| Ocean water temperature in Portsmouth in April | ||||
| May | 71.2°F | 63°F | 78.1°F | warm |
| Ocean water temperature in Portsmouth in May | ||||
| June | 77.7°F | 70.9°F | 83.1°F | hot |
| Ocean water temperature in Portsmouth in June | ||||
| July | 81.1°F | 78.1°F | 86.5°F | hot |
| Ocean water temperature in Portsmouth in July | ||||
| August | 81.7°F | 77.9°F | 85.5°F | hot |
| Ocean water temperature in Portsmouth in August | ||||
| September | 79.5°F | 73.8°F | 84.7°F | hot |
| Ocean water temperature in Portsmouth in September | ||||
| October | 74.7°F | 66.7°F | 80.8°F | warm |
| Ocean water temperature in Portsmouth in October | ||||
| November | 69.3°F | 62.8°F | 75.6°F | warm |
| Ocean water temperature in Portsmouth in November | ||||
| December | 66°F | 57.4°F | 71.6°F | cold |
| Ocean water temperature in Portsmouth in December | ||||
Chart monthly average water temperature in Portsmouth
