This data the coastal Keyport 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.
Water temperature in Keyport today is 72.3°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Keyport was recorded in 2018 and was 78.3°F, and the coldest was recorded in 2017 at 70.2°F. Sea water temperature in Keyport is expected to drop to 72°F in the next 10 days. September average water temperature in Keyport is 71.2°F, the minimum temperature is 64.9°F, and the maximum is 78.3°F.
The swimming season in Keyport lasts from June to September. During those months, Keyport water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Keyport in winter reaches 42.1°F, in spring 49.1°F, in summer the average temperature rises to 72.5°F, and in autumn it is 62.8°F.
September 5, 2025 |
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today temp |
72.3°F |
September 4, 2025 |
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yesterday temp |
72.1°F |
The ocean salinity in Keyport is 27.35‰, and the average salinity of the World Ocean is 35‰.
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 Keyport. 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 Keyport. Data in table shown for September 5, 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 |
---|---|---|---|
1' 8" | 1' 7" | 1' 5" | 1' 4" |
0.52 m | 0.48 m | 0.43 m | 0.4 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
1' 3" | 1' 4" | 1' 9" | 1' 8" |
0.38 m | 0.4 m | 0.53 m | 0.51 m |
Data in a table show Keyport temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Keyport.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
![]() | ![]() | ![]() | ![]() |
69.1°F | 68.5°F | 67.6°F | 71.2°F |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
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82.8°F | 89.2°F | 85.6°F | 79.3°F |
You may also be interested in other sections of our site for Keyport: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly sea temperature in Keyport. 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 Keyport 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 | 40.8°F | 33.6°F | 47.3°F | cold |
Ocean water temperature in Keyport in January | ||||
February | 39°F | 34.2°F | 44.6°F | cold |
Ocean water temperature in Keyport in February | ||||
March | 41.5°F | 34.9°F | 50.4°F | cold |
Ocean water temperature in Keyport in March | ||||
April | 48.2°F | 40.6°F | 57.6°F | cold |
Ocean water temperature in Keyport in April | ||||
May | 57.4°F | 48.7°F | 68.7°F | cold |
Ocean water temperature in Keyport in May | ||||
June | 67.5°F | 59.9°F | 77°F | cold |
Ocean water temperature in Keyport in June | ||||
July | 74.8°F | 68°F | 82.8°F | warm |
Ocean water temperature in Keyport in July | ||||
August | 75.2°F | 69.6°F | 81.1°F | warm |
Ocean water temperature in Keyport in August | ||||
September | 71.2°F | 64.9°F | 78.3°F | warm |
Ocean water temperature in Keyport in September | ||||
October | 63.1°F | 56.1°F | 71.8°F | cold |
Ocean water temperature in Keyport in October | ||||
November | 53.8°F | 47.1°F | 61.7°F | cold |
Ocean water temperature in Keyport in November | ||||
December | 46.4°F | 37.6°F | 52.5°F | cold |
Ocean water temperature in Keyport in December |