Dorchester water temp
This data the coastal Dorchester 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 Dorchester
Water temperature in Dorchester today is 64.6°F. Based on our historical data over a period of ten years, the warmest water in this day in Dorchester was recorded in 2018 and was 71.2°F, and the coldest was recorded in 2017 at 62.2°F. Sea water temperature in Dorchester is expected to drop to 64.2°F in the next 10 days. September average water temperature in Dorchester is 64°F, the minimum temperature is 58.6°F, and the maximum is 71.8°F.
The swimming season in Dorchester lasts from July to August. During those months, Dorchester water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Dorchester in winter reaches 41.7°F, in spring 45°F, in summer the average temperature rises to 64.4°F, and in autumn it is 57.4°F.
Dorchester water temperature now
| September 5, 2025 |
|---|
| today temp |
| 64.6°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 65.1°F |
The ocean salinity in Dorchester is 30.58‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Dorchester 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 Dorchester. 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 Dorchester. Data in table shown for September 5, 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' 7" | 1' 5" | 1' 5" | 1' 4" |
| 0.48 m | 0.43 m | 0.42 m | 0.41 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 7" | 1' 8" | 1' 10" | 1' 10" |
| 0.47 m | 0.51 m | 0.57 m | 0.55 m |
Surf report in Dorchester
Dorchester weather forecast
Current temperature and weather
Data in a table show Dorchester temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Dorchester.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  |  | |
| 65.8°F | 66.2°F | 66.6°F | 68°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 | | |  |
| 75°F | 78.8°F | 77.5°F | 70.2°F |
You may also be interested in other sections of our site for Dorchester: Sunrise and Sunset, Tides
Dorchester water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Dorchester. 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 Dorchester 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 | 41.2°F | 36.3°F | 45.9°F | cold |
| Ocean water temperature in Dorchester in January | ||||
| February | 38.5°F | 34.2°F | 42.4°F | cold |
| Ocean water temperature in Dorchester in February | ||||
| March | 39.2°F | 35.4°F | 47.3°F | cold |
| Ocean water temperature in Dorchester in March | ||||
| April | 43.7°F | 36.7°F | 49.5°F | cold |
| Ocean water temperature in Dorchester in April | ||||
| May | 51.8°F | 43.3°F | 63.1°F | cold |
| Ocean water temperature in Dorchester in May | ||||
| June | 59.7°F | 51.4°F | 67.1°F | cold |
| Ocean water temperature in Dorchester in June | ||||
| July | 66.2°F | 59.7°F | 73.9°F | cold |
| Ocean water temperature in Dorchester in July | ||||
| August | 67.3°F | 61.7°F | 73.2°F | cold |
| Ocean water temperature in Dorchester in August | ||||
| September | 64°F | 58.6°F | 71.8°F | cold |
| Ocean water temperature in Dorchester in September | ||||
| October | 57.6°F | 51.6°F | 64.2°F | cold |
| Ocean water temperature in Dorchester in October | ||||
| November | 50.7°F | 45°F | 56.8°F | cold |
| Ocean water temperature in Dorchester in November | ||||
| December | 45.3°F | 39.2°F | 50.4°F | cold |
| Ocean water temperature in Dorchester in December | ||||
Chart monthly average water temperature in Dorchester
