World sea water temperatures

Old Lyme water temp

This data the coastal Old Lyme 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 Old Lyme

Water temperature in Old Lyme today is 70°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Old Lyme was recorded in 2018 and was 74.5°F, and the coldest was recorded in 2007 at 67.6°F. Sea water temperature in Old Lyme is expected to drop to 69.8°F in the next 10 days. September average water temperature in Old Lyme is 69.3°F, the minimum temperature is 64.2°F, and the maximum is 75.6°F.

The swimming season in Old Lyme lasts from July to September. During those months, Old Lyme water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Old Lyme in winter reaches 42.4°F, in spring 45.3°F, in summer the average temperature rises to 67.3°F, and in autumn it is 63°F.

Old Lyme water temperature now


September 5, 2025
today temp
70°F
September 4, 2025
yesterday temp
69.4°F


The ocean salinity in Old Lyme is 27.85‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Old Lyme 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 Old Lyme. 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 Old Lyme. 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' 8"1' 6"1' 4"1' 3"
0.52 m0.46 m0.4 m0.38 m
12-15 h15-18 h18-21 h21-24 h
1' 3"1' 8"2' 2"2' 7"
0.38 m0.51 m0.65 m0.79 m

Surf report in Old Lyme

Old Lyme wave height and direction

Old Lyme weather forecast

Old Lyme wind speed and direction

Current temperature and weather

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

0-3 h3-6 h6-9 h9-12 h
66°F66.9°F67.5°F70.5°F
12-15 h15-18 h18-21 h21-24 h
74.8°F80.4°F73.4°F69.8°F

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

Old Lyme water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Old Lyme. 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 Old Lyme 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
January41.4°F36°F48.6°Fcold
Ocean water temperature in Old Lyme in January
February38.3°F32°F43°Fcold
Ocean water temperature in Old Lyme in February
March39.4°F32.5°F50°Fcold
Ocean water temperature in Old Lyme in March
April44.2°F36.3°F52°Fcold
Ocean water temperature in Old Lyme in April
May52.2°F45.7°F63.1°Fcold
Ocean water temperature in Old Lyme in May
June61.3°F54.9°F69.8°Fcold
Ocean water temperature in Old Lyme in June
July69.3°F62.8°F74.5°Fwarm
Ocean water temperature in Old Lyme in July
August71.2°F66°F75.9°Fwarm
Ocean water temperature in Old Lyme in August
September69.3°F64.2°F75.6°Fwarm
Ocean water temperature in Old Lyme in September
October63.9°F56.7°F69.4°Fcold
Ocean water temperature in Old Lyme in October
November55.9°F48.7°F62.8°Fcold
Ocean water temperature in Old Lyme in November
December47.5°F40.6°F54°Fcold
Ocean water temperature in Old Lyme in December

Chart monthly average water temperature in Old Lyme

Water temperature in Old Lyme

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 Old Lyme 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
Rocky Neck69.8°F77°F2' 0"
Plum Island70°F71.6°F2' 1"
Hammonasset Beach71.1°F75.2°F1' 7"
Orient Point70.5°F73.4°F1' 11"
Southold71.6°F73.4°F1' 7"
Gardiners Bay70.5°F73.4°F1' 11"
Noank68.7°F77°F2' 3"
Sag Harbor70.5°F73.4°F1' 8"
Peconic Bay70.5°F73.4°F1' 8"
Noyack70.9°F73.4°F1' 8"

Connecticut photo gallery

  • Following the early cold wave hitting the U.S.,  ice began to form on parts of Norwalk CT Harbo
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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 Old Lyme 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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