World sea water temperatures

Water temperature in Dennis (MA) in January

Is it warm enough to swim in Dennis in January? Average water temperature in Dennis in January is 39.7°F and therefore is not suitable for comfortable swimming. The warmest sea in Dennis in January is 46.4°F, and the coldest is 33.1°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 January 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 January.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
January 142.1°F42.1°F39°F46.4°F
January 241.5°F42.4°F39.4°F45.7°F
January 340.1°F43.2°F39°F45.3°F
January 441.5°F42.8°F38.1°F45.3°F
January 539.9°F41.2°F37.2°F45.3°F
January 640.3°F42.1°F36.7°F45.5°F
January 736.3°F42.6°F36.3°F45.5°F
January 835.8°F41.5°F35.8°F46.4°F
January 936.1°F41.7°F36°F45°F
January 1035.2°F39.4°F35.2°F44.8°F
January 1136.1°F40.3°F35.8°F43.3°F
January 1236.9°F41.5°F36.1°F43.3°F
January 1337.4°F41.2°F37.2°F43.5°F
January 1435.6°F40.3°F35.6°F43.5°F
January 1536.7°F41.5°F36.7°F43.3°F
Day 2025 2024 Min Max
January 1636.9°F41.7°F36.9°F43.2°F
January 1736.7°F38.7°F36.7°F41.9°F
January 1836.5°F40.3°F36.5°F42.1°F
January 1937.6°F40.5°F37.4°F42.3°F
January 2034.2°F40.3°F34.2°F42.4°F
January 2135.1°F36.1°F35.1°F42.8°F
January 2235.8°F37.8°F35.8°F42.3°F
January 2333.8°F38.3°F33.8°F41.7°F
January 2434.9°F38.8°F34.9°F41.7°F
January 2534.2°F39.2°F34.2°F41.4°F
January 2635.2°F39.4°F34.9°F41.5°F
January 2735.8°F39.4°F35.1°F41°F
January 2834.2°F39.6°F34.2°F41.2°F
January 2934°F39.7°F34°F41°F
January 3033.1°F39.2°F33.1°F41.4°F
January 3134.5°F39°F33.3°F41.5°F
Dennis water temp chart in January

Average water temperature in Dennis in January over a decade

20162017201820192020
41.2°F40.5°F37.2°F39.2°F39.2°F
20212022202320242025
39.9°F39.7°F41.4°F40.5°F36.5°F

Dennis sea state in January

Chart comparing the height of waves in Dennis in January 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 January

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 January?

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

AvrMinMax
Harborview Beach39.7°F33.1°F46.4°F
Chapin Beach39.6°F32.4°F46.4°F
Orleans40.8°F34.3°F46.8°F
Skaket Beach40.8°F34.3°F46.8°F
First Encounter Beach40.8°F34.3°F46.8°F
Crosby Landing Beach40.8°F34.3°F46.8°F
Linnell Landing Beach40.8°F34.3°F46.8°F
Ellis Landing beach40.8°F34.3°F46.8°F
Rock Harbor Beach40.8°F34.3°F46.8°F
Thumpertown Beach40.8°F34.3°F46.8°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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