World sea water temperatures

Water temperature in Portsmouth (NC) in September

Is it warm enough to swim in Portsmouth in September? Average water temperature in Portsmouth in September is 79.5°F and therefore suitable for comfortable swimming. The warmest sea in Portsmouth in September is 84.7°F, and the coldest is 73.8°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Portsmouth

Changes water temperature in Portsmouth in September 2025, 2024

To get an accurate forecast for the water temperature in Portsmouth for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Portsmouth, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 178.6°F82°F78.6°F82.9°F
September 277.9°F81.9°F77.4°F82.9°F
September 377.9°F79.9°F77.9°F83.3°F
September 477.4°F79.9°F77.4°F83.8°F
September 5 79°F79°F84.2°F
September 6 78.1°F78.1°F84.2°F
September 7 77.4°F77.4°F83.8°F
September 8 77.4°F77.4°F84.2°F
September 9 75.6°F75.6°F84°F
September 10 75.9°F75.9°F84.4°F
September 11 76.8°F76.8°F84.6°F
September 12 77°F76.3°F84.7°F
September 13 77°F77°F84.4°F
September 14 77.9°F77.9°F84°F
September 15 78.6°F77.9°F83.3°F
Day 2025 2024 Min Max
September 16 78.6°F78.3°F82.4°F
September 17 78.3°F77.9°F81.1°F
September 18 78.1°F77.9°F81.5°F
September 19 78.1°F76.5°F81.5°F
September 20 77.2°F76.3°F81.7°F
September 21 76.6°F75.9°F81.7°F
September 22 77.2°F75.6°F81°F
September 23 76.3°F75.6°F81°F
September 24 74.7°F74.7°F81°F
September 25 75.9°F74.7°F80.8°F
September 26 75.9°F73.8°F80.4°F
September 27 76.1°F74.3°F80.4°F
September 28 77.2°F74.3°F80.8°F
September 29 78.8°F74.5°F80.1°F
September 30 78.8°F74.1°F79.2°F
Portsmouth water temp chart in September

Average water temperature in Portsmouth in September over a decade

20152016201720182019
80.1°F79.7°F78.3°F82.2°F78.8°F
20202021202220232024
79.5°F79.7°F80.6°F79.9°F77.7°F

Portsmouth sea state in September

Chart comparing the height of waves in Portsmouth in September over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Portsmouth in September

Portsmouth water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in September?

Want to know where the water temperature in September is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Davis79.7°F74.5°F84.6°F
Buxton78.6°F70.5°F84.2°F
Engelhard78.4°F70.5°F85.8°F
Cape Hatteras79°F70°F84.2°F
Oriental79°F71.8°F85.6°F
Outer Banks78.4°F70.5°F83.8°F
Harkers Island79.7°F73.9°F84.7°F
Cape Lookout80.1°F74.8°F84.2°F
Beaufort79.7°F74.1°F84.9°F
Minnesott Beach79°F71.6°F85.5°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Portsmouth is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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