World sea water temperatures

Water temperature in Dennis (MA) in July

Is it warm enough to swim in Dennis in July? Average water temperature in Dennis in July is 69.1°F and therefore suitable for comfortable swimming. The warmest sea in Dennis in July is 77.5°F, and the coldest is 60.8°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Dennis

Changes water temperature in Dennis in July 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
July 165.1°F67.5°F60.8°F72.5°F
July 264.4°F68.4°F60.8°F70°F
July 366.7°F68°F61°F71.2°F
July 467.5°F69.6°F61°F69.6°F
July 568.2°F68.7°F61.9°F69.8°F
July 668.5°F70.9°F61.2°F71.2°F
July 767.8°F69.4°F61.7°F71.6°F
July 870.2°F68.5°F61.9°F72°F
July 969.6°F70.2°F62.2°F72.1°F
July 1068.4°F73.8°F62.6°F73.8°F
July 1168.5°F74.5°F62.6°F74.5°F
July 1266.2°F73.8°F63.5°F73.8°F
July 1368.9°F72.1°F64.4°F72.9°F
July 1469.3°F74.7°F64.2°F74.7°F
July 1570.9°F74.3°F64.4°F74.3°F
Day 2025 2024 Min Max
July 1671.6°F75.6°F64°F75.6°F
July 1772.5°F73.2°F64.6°F73.4°F
July 1871.8°F72.7°F65.7°F73°F
July 1971.6°F72.5°F65.5°F73.6°F
July 2070.7°F73°F63.7°F73.9°F
July 2169.3°F73.9°F63.1°F74.7°F
July 2268.7°F72.5°F64.2°F75.7°F
July 2369.6°F70.9°F63.9°F74.8°F
July 2469.8°F70°F64°F75°F
July 2571.2°F69.4°F64.6°F76.1°F
July 2671.2°F70.3°F64.6°F75.9°F
July 2769.1°F69.8°F63.9°F75.6°F
July 2868.5°F70°F64.2°F77.5°F
July 2970°F69.4°F63.9°F76.5°F
July 3071.4°F69.6°F64.4°F76.3°F
July 3170.9°F70.7°F65.1°F75.7°F
Dennis water temp chart in July

Average water temperature in Dennis in July over a decade

20162017201820192020
68.9°F65.7°F68.9°F72.1°F72.1°F
20212022202320242025
70°F71.4°F71.8°F71.2°F69.3°F

Dennis sea state in July

Chart comparing the height of waves in Dennis in July 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 Dennis in July

Dennis 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 July?

Want to know where the water temperature in July 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 July. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Harborview Beach69.1°F60.8°F77.5°F
Chapin Beach69.1°F61°F76.3°F
Orleans68.2°F60.3°F76.6°F
Skaket Beach68.2°F60.3°F76.6°F
First Encounter Beach68.2°F60.3°F76.6°F
Crosby Landing Beach68.2°F60.3°F76.6°F
Linnell Landing Beach68.2°F60.3°F76.6°F
Ellis Landing beach68.2°F60.3°F76.6°F
Rock Harbor Beach68.2°F60.3°F76.6°F
Thumpertown Beach68.2°F60.3°F76.6°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 Dennis 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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