World sea water temperatures

Chelsea water temp

This data the coastal Chelsea 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 Chelsea

Water temperature in Chelsea today is 64.9°F. Based on our historical data over a period of ten years, the warmest water in this day in Chelsea was recorded in 2018 and was 70.5°F, and the coldest was recorded in 2017 at 62.1°F. Sea water temperature in Chelsea is expected to drop to 64.4°F in the next 10 days. September average water temperature in Chelsea is 64°F, the minimum temperature is 58.6°F, and the maximum is 71.2°F.

The swimming season in Chelsea lasts from July to August. During those months, Chelsea water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Chelsea in winter reaches 41.2°F, in spring 45°F, in summer the average temperature rises to 64.8°F, and in autumn it is 57.4°F.

Chelsea water temperature now


September 5, 2025
today temp
64.9°F
September 4, 2025
yesterday temp
65.7°F


The ocean salinity in Chelsea is 30.58‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Chelsea 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 Chelsea. 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 Chelsea. 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 h3-6 h6-9 h9-12 h
1' 7"1' 5"1' 5"1' 4"
0.48 m0.43 m0.42 m0.41 m
12-15 h15-18 h18-21 h21-24 h
1' 7"1' 8"1' 10"1' 10"
0.47 m0.51 m0.57 m0.55 m

Surf report in Chelsea

Chelsea wave height and direction

Chelsea weather forecast

Chelsea wind speed and direction

Current temperature and weather

Data in a table show Chelsea temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Chelsea.

0-3 h3-6 h6-9 h9-12 h
65.7°F66.2°F66.9°F71.4°F
12-15 h15-18 h18-21 h21-24 h
81.3°F81.5°F82°F73.2°F

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

Chelsea water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Chelsea. 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 Chelsea 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
January40.6°F35.2°F45.7°Fcold
Ocean water temperature in Chelsea in January
February38.1°F32.5°F42.1°Fcold
Ocean water temperature in Chelsea in February
March39°F34.9°F47.3°Fcold
Ocean water temperature in Chelsea in March
April43.9°F36.9°F50.2°Fcold
Ocean water temperature in Chelsea in April
May52°F43.7°F63.1°Fcold
Ocean water temperature in Chelsea in May
June60.3°F52.3°F69.3°Fcold
Ocean water temperature in Chelsea in June
July66.6°F59.5°F75°Fcold
Ocean water temperature in Chelsea in July
August67.5°F62.2°F73.9°Fcold
Ocean water temperature in Chelsea in August
September64°F58.6°F71.2°Fcold
Ocean water temperature in Chelsea in September
October57.6°F51.4°F64.6°Fcold
Ocean water temperature in Chelsea in October
November50.4°F43.5°F58.5°Fcold
Ocean water temperature in Chelsea in November
December44.8°F37.9°F50.2°Fcold
Ocean water temperature in Chelsea in December

Chart monthly average water temperature in Chelsea

Water temperature in Chelsea

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 Chelsea 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
Constitution Beach64.8°F84.2°F1' 7"
Carson Beach65.3°F84.2°F1' 7"
South Boston65.3°F84.2°F1' 7"
Pleasure Bay65.3°F84.2°F1' 7"
M Street Beach65.3°F84.2°F1' 7"
Revere Beach64.4°F84.2°F1' 7"
Boston Harbor65.1°F80.6°F1' 7"
Nahant Beach63.7°F84.2°F1' 10"
Hingham64.6°F78.8°F1' 7"
Hull64.6°F78.8°F1' 7"

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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 Chelsea 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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