Delaware Bay water temp
This data the coastal Delaware Bay 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 Delaware Bay
Water temperature in Delaware Bay today is 70.7°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Delaware Bay was recorded in 2018 and was 74.7°F, and the coldest was recorded in 2013 at 68°F. Sea water temperature in Delaware Bay is expected to drop to 69.3°F in the next 10 days. September average water temperature in Delaware Bay is 73.4°F, the minimum temperature is 66.7°F, and the maximum is 81.3°F.
The swimming season in Delaware Bay lasts from June to September. During those months, Delaware Bay water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Delaware Bay in winter reaches 41.2°F, in spring 51.8°F, in summer the average temperature rises to 75.2°F, and in autumn it is 64.2°F.
Delaware Bay water temperature now
| September 23, 2025 |
|---|
| today temp |
| 70.7°F |
| September 22, 2025 |
|---|
| yesterday temp |
| 71.8°F |
The ocean salinity in Delaware Bay is 27.87‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Delaware Bay 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 Delaware Bay. 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 Delaware Bay. Data in table shown for September 23, 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' 3" | 1' 3" | 1' 3" | 1' 3" |
| 0.39 m | 0.38 m | 0.37 m | 0.37 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 2" | 1' 2" | 1' 5" | 1' 8" |
| 0.36 m | 0.36 m | 0.43 m | 0.5 m |
Surf report in Delaware Bay
Delaware Bay weather forecast
Current temperature and weather
Data in a table show Delaware Bay temperature today (September 23, 2025). For more information and forecast for a few days, go to the weather forecast Delaware Bay.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 64.6°F | 63.1°F | 62.4°F | 70.3°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  |  | |
| 84.7°F | 84°F | 79°F | 73.8°F |
You may also be interested in other sections of our site for Delaware Bay: Sunrise and Sunset, Tides
Delaware Bay water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Delaware Bay. 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 Delaware Bay 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 | 39.9°F | 31.1°F | 49.1°F | cold |
| Ocean water temperature in Delaware Bay in January | ||||
| February | 38.5°F | 30.9°F | 50°F | cold |
| Ocean water temperature in Delaware Bay in February | ||||
| March | 43°F | 31.1°F | 53.2°F | cold |
| Ocean water temperature in Delaware Bay in March | ||||
| April | 51.4°F | 41.9°F | 59.7°F | cold |
| Ocean water temperature in Delaware Bay in April | ||||
| May | 61°F | 52.9°F | 72.5°F | cold |
| Ocean water temperature in Delaware Bay in May | ||||
| June | 71.1°F | 63°F | 78.6°F | warm |
| Ocean water temperature in Delaware Bay in June | ||||
| July | 77.4°F | 72.3°F | 82.9°F | hot |
| Ocean water temperature in Delaware Bay in July | ||||
| August | 77.2°F | 71.1°F | 83.8°F | hot |
| Ocean water temperature in Delaware Bay in August | ||||
| September | 73.4°F | 66.7°F | 81.3°F | warm |
| Ocean water temperature in Delaware Bay in September | ||||
| October | 65.1°F | 54.9°F | 74.3°F | cold |
| Ocean water temperature in Delaware Bay in October | ||||
| November | 54.1°F | 45.1°F | 63°F | cold |
| Ocean water temperature in Delaware Bay in November | ||||
| December | 45.1°F | 36.5°F | 53.8°F | cold |
| Ocean water temperature in Delaware Bay in December | ||||
Chart monthly average water temperature in Delaware Bay
