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Diamond Beach water temp

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This data the coastal Diamond 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 Diamond Beach

Water temperature in Diamond Beach today is 73.4°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Diamond Beach was recorded in 2018 and was 78.8°F, and the coldest was recorded in 2024 at 71.1°F. Sea water temperature in Diamond Beach is expected to drop to 72.7°F in the next 10 days. September average water temperature in Diamond Beach is 72.5°F, the minimum temperature is 66.6°F, and the maximum is 79.7°F.

The swimming season in Diamond Beach lasts from June to October. During those months, Diamond Beach water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Diamond Beach in winter reaches 43.5°F, in spring 49.6°F, in summer the average temperature rises to 72°F, and in autumn it is 64.9°F.

Diamond Beach water temperature now


September 5, 2025
today temp
73.4°F
September 4, 2025
yesterday temp
72.9°F


The ocean salinity in Diamond Beach is 29.92‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Diamond 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 Diamond 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 Diamond Beach. Data in table shown for September 6, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

0-3 h3-6 h6-9 h9-12 h
3' 6"3' 6"3' 3"2' 11"
1.06 m1.06 m0.98 m0.88 m
12-15 h15-18 h18-21 h21-24 h
2' 7"2' 9"3' 6"3' 3"
0.78 m0.85 m1.07 m1 m

Surf report in Diamond Beach

Diamond Beach wave height and direction

Diamond Beach weather forecast

Diamond Beach wind speed and direction

Current temperature and weather

Data in a table show Diamond Beach temperature today (September 6, 2025). For more information and forecast for a few days, go to the weather forecast Diamond Beach.

0-3 h3-6 h6-9 h9-12 h
71.1°F71.4°F71.1°F75.6°F
12-15 h15-18 h18-21 h21-24 h
85.6°F86.2°F82.2°F75.9°F

You may also be interested in other sections of our site for Diamond Beach: Sunrise and Sunset, Tides

Diamond Beach water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Diamond 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 Diamond 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

MonthAvrMinMax
January42.4°F35.6°F50.9°Fcold
Ocean water temperature in Diamond Beach in January
February40.1°F33.1°F48.2°Fcold
Ocean water temperature in Diamond Beach in February
March42.6°F33.3°F52.3°Fcold
Ocean water temperature in Diamond Beach in March
April48.7°F40.3°F57°Fcold
Ocean water temperature in Diamond Beach in April
May57.6°F49.3°F70.3°Fcold
Ocean water temperature in Diamond Beach in May
June67.3°F58.6°F76.3°Fcold
Ocean water temperature in Diamond Beach in June
July74.1°F64.8°F80.2°Fwarm
Ocean water temperature in Diamond Beach in July
August74.7°F64.8°F79.7°Fwarm
Ocean water temperature in Diamond Beach in August
September72.5°F66.6°F79.7°Fwarm
Ocean water temperature in Diamond Beach in September
October65.7°F56.5°F73.9°Fcold
Ocean water temperature in Diamond Beach in October
November56.5°F48.4°F64.4°Fcold
Ocean water temperature in Diamond Beach in November
December48.2°F39°F56.7°Fcold
Ocean water temperature in Diamond Beach in December

Chart monthly average water temperature in Diamond Beach

Water temperature in Diamond Beach

Where is the warmest sea water in the world?

If you want to plan a vacation on the beach and enjoy the warm sea, choose the day of the year, region and the minimum comfortable sea/ocean temperature that interests you. As a result, you will get a list of countries and cities in which the average sea temperature or maximum temperature on this day over the past 10 years exceeds your chosen value

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

Nearby beaches and cities

The nearest beaches and cities from Diamond Beach with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

WaterWeatherWave
Cape May Point73.2°F86°F2' 9"
Lower Township73.2°F86°F2' 9"
Cape Henlopen73.8°F86°F2' 0"
Broadkill Beach73.4°F86°F1' 7"
Towers Beach73.8°F86°F2' 8"
Rehoboth Beach73.9°F86°F1' 10"
Dewey beach73.9°F86°F1' 10"
Lewes73.8°F86°F1' 10"
Slaughter Beach73°F89.6°F1' 7"
Rehoboth Bay73.9°F86°F2' 8"

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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 Diamond Beach 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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