Cohasset water temp
This data the coastal Cohasset 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 Cohasset
Water temperature in Cohasset today is 63°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Cohasset was recorded in 2016 and was 66°F, and the coldest was recorded in 2012 at 60.4°F. Sea water temperature in Cohasset is expected to drop to 61.5°F in the next 10 days. September average water temperature in Cohasset is 64.2°F, the minimum temperature is 58.8°F, and the maximum is 72.5°F.
The swimming season in Cohasset lasts from July to August. During those months, Cohasset water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Cohasset in winter reaches 41.9°F, in spring 44.6°F, in summer the average temperature rises to 64.4°F, and in autumn it is 57.9°F.
Cohasset water temperature now
| September 21, 2025 |
|---|
| today temp |
| 63°F |
| September 20, 2025 |
|---|
| yesterday temp |
| 63.7°F |
The ocean salinity in Cohasset is 30.96‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Cohasset 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 Cohasset. 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 Cohasset. Data in table shown for September 22, 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' 4" | 1' 3" | 1' 3" | 1' 2" |
| 0.41 m | 0.39 m | 0.37 m | 0.36 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 2" | 1' 2" | 1' 3" | 1' 4" |
| 0.35 m | 0.35 m | 0.38 m | 0.4 m |
Surf report in Cohasset
Cohasset weather forecast
Current temperature and weather
Data in a table show Cohasset temperature today (September 22, 2025). For more information and forecast for a few days, go to the weather forecast Cohasset.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 57.6°F | 57.7°F | 58.1°F | 59.5°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 | |  | |
| 61°F | 61.5°F | 61.7°F | 61.7°F |
You may also be interested in other sections of our site for Cohasset: Sunrise and Sunset, Tides
Cohasset water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Cohasset. 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 Cohasset 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 | 41.4°F | 37.2°F | 46°F | cold |
| Ocean water temperature in Cohasset in January | ||||
| February | 38.7°F | 35.2°F | 42.8°F | cold |
| Ocean water temperature in Cohasset in February | ||||
| March | 39.2°F | 35.4°F | 47.1°F | cold |
| Ocean water temperature in Cohasset in March | ||||
| April | 43.5°F | 36.7°F | 49.3°F | cold |
| Ocean water temperature in Cohasset in April | ||||
| May | 51.3°F | 43.2°F | 63°F | cold |
| Ocean water temperature in Cohasset in May | ||||
| June | 59.5°F | 50.9°F | 68°F | cold |
| Ocean water temperature in Cohasset in June | ||||
| July | 66.2°F | 59.9°F | 72.3°F | cold |
| Ocean water temperature in Cohasset in July | ||||
| August | 67.5°F | 62.1°F | 72.5°F | cold |
| Ocean water temperature in Cohasset in August | ||||
| September | 64.2°F | 58.8°F | 72.5°F | cold |
| Ocean water temperature in Cohasset in September | ||||
| October | 58.1°F | 52°F | 64.2°F | cold |
| Ocean water temperature in Cohasset in October | ||||
| November | 51.3°F | 46°F | 57.6°F | cold |
| Ocean water temperature in Cohasset in November | ||||
| December | 45.7°F | 41°F | 50.5°F | cold |
| Ocean water temperature in Cohasset in December | ||||
Chart monthly average water temperature in Cohasset
