Onslow Beach water temp
This data the coastal Onslow Beach 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 Onslow Beach
Water temperature in Onslow Beach today is 78.1°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Onslow Beach was recorded in 2018 and was 81.7°F, and the coldest was recorded in 2008 at 75.9°F. Sea water temperature in Onslow Beach is expected to drop to 76.3°F in the next 10 days. September average water temperature in Onslow Beach is 80.1°F, the minimum temperature is 75.2°F, and the maximum is 84.2°F.
The swimming season in Onslow Beach lasts from May to November. During those months, Onslow Beach water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Onslow Beach in winter reaches 57.7°F, in spring 63.9°F, in summer the average temperature rises to 80.4°F, and in autumn it is 73.4°F.
Onslow Beach water temperature now
| September 27, 2025 |
|---|
| today temp |
| 78.1°F |
| September 26, 2025 |
|---|
| yesterday temp |
| 78.1°F |
The ocean salinity in Onslow Beach is 34.35‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Onslow Beach 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 Onslow Beach. 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 Onslow Beach. Data in table shown for September 27, 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' 2" | 2' 2" | 2' 1" | 2' 1" |
| 0.66 m | 0.66 m | 0.64 m | 0.63 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 2' 1" | 2' 2" | 2' 3" | 2' 7" |
| 0.63 m | 0.65 m | 0.69 m | 0.78 m |
Surf report in Onslow Beach
Onslow Beach weather forecast
Current temperature and weather
Data in a table show Onslow Beach temperature today (September 27, 2025). For more information and forecast for a few days, go to the weather forecast Onslow Beach.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | |  |  |
| 75.9°F | 75.7°F | 73.2°F | 76.8°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 |  | | |
| 79.3°F | 79.3°F | 78.3°F | 77.4°F |
You may also be interested in other sections of our site for Onslow Beach: Sunrise and Sunset, Tides
Onslow Beach water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Onslow Beach. 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 Onslow Beach 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 | 57.2°F | 45.3°F | 69.1°F | cold |
| Ocean water temperature in Onslow Beach in January | ||||
| February | 55.2°F | 47.7°F | 65.3°F | cold |
| Ocean water temperature in Onslow Beach in February | ||||
| March | 57.9°F | 49.1°F | 67.1°F | cold |
| Ocean water temperature in Onslow Beach in March | ||||
| April | 63°F | 54°F | 72.5°F | cold |
| Ocean water temperature in Onslow Beach in April | ||||
| May | 70.7°F | 63°F | 78.4°F | warm |
| Ocean water temperature in Onslow Beach in May | ||||
| June | 77.9°F | 70°F | 82.8°F | hot |
| Ocean water temperature in Onslow Beach in June | ||||
| July | 81.3°F | 76.6°F | 86°F | hot |
| Ocean water temperature in Onslow Beach in July | ||||
| August | 81.9°F | 77.4°F | 84.7°F | hot |
| Ocean water temperature in Onslow Beach in August | ||||
| September | 80.1°F | 75.2°F | 84.2°F | hot |
| Ocean water temperature in Onslow Beach in September | ||||
| October | 74.1°F | 65.3°F | 81.7°F | warm |
| Ocean water temperature in Onslow Beach in October | ||||
| November | 66.2°F | 57.4°F | 73°F | cold |
| Ocean water temperature in Onslow Beach in November | ||||
| December | 60.6°F | 52.3°F | 68.7°F | cold |
| Ocean water temperature in Onslow Beach in December | ||||
Chart monthly average water temperature in Onslow Beach
