World sea water temperatures

Water temperature in Old Saybrook (CT) in September

Is it warm enough to swim in Old Saybrook in September? Average water temperature in Old Saybrook in September is 69.6°F and therefore suitable for comfortable swimming. The warmest sea in Old Saybrook in September is 75.7°F, and the coldest is 65.7°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Old Saybrook

Changes water temperature in Old Saybrook in September 2025, 2024

To get an accurate forecast for the water temperature in Old Saybrook for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Old Saybrook, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 169.4°F68.7°F67.5°F73.4°F
September 268.9°F70.5°F67.8°F73.2°F
September 369.1°F69.3°F67.6°F73.9°F
September 469.4°F68.9°F68.4°F74.5°F
September 571.2°F68.7°F68.4°F74.7°F
September 670.7°F68.5°F68.4°F75.7°F
September 770.7°F67.6°F67.6°F74.8°F
September 869.3°F68.2°F68.2°F74.5°F
September 968.7°F67.8°F67.8°F73.8°F
September 1068.7°F68.4°F68.4°F73.6°F
September 1168°F67.8°F67.8°F73.6°F
September 1268.2°F68.4°F68.2°F72.5°F
September 1368.4°F67.8°F67.8°F72.7°F
September 1469.3°F68.5°F68.5°F72.5°F
September 1569.1°F68.4°F68.4°F72.1°F
Day 2025 2024 Min Max
September 1668.9°F68.7°F68.4°F72°F
September 1768.5°F67.6°F66.9°F71.8°F
September 1869.1°F67.6°F67.1°F72°F
September 1969.6°F67.8°F66.2°F72.3°F
September 2069.4°F68.2°F66.6°F72°F
September 2168.7°F68.2°F66.7°F71.6°F
September 2268.4°F68.5°F67.1°F71.8°F
September 2368.5°F67.5°F66.7°F71.6°F
September 2468.9°F65.7°F65.7°F70.9°F
September 25 66.2°F66.2°F70.5°F
September 26 66.2°F65.7°F70.9°F
September 27 66°F65.7°F70.2°F
September 28 66.2°F66°F69.8°F
September 29 66°F66°F69.6°F
September 30 66.4°F66.2°F69.4°F
Old Saybrook water temp chart in September

Average water temperature in Old Saybrook in September over a decade

20152016201720182019
71.4°F70.9°F69.1°F72°F68.9°F
20202021202220232024
69.4°F70.7°F70.7°F69.4°F67.8°F

Old Saybrook sea state in September

Chart comparing the height of waves in Old Saybrook in September 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 Old Saybrook in September

Old Saybrook 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 September?

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

AvrMinMax
Saybrook Manor69.6°F65.7°F75.7°F
Westbrook69.8°F65.5°F76.1°F
Old Lyme69.3°F64.2°F75.6°F
Hammonasset Beach70.5°F66.6°F77.4°F
Madison70.7°F66.7°F77.5°F
Rocky Neck68.9°F63.3°F74.8°F
Waterford68.7°F63.1°F74.5°F
Greenport70.2°F65.7°F76.5°F
Shelter Island Heights70.2°F65.7°F76.5°F
Guilford71.2°F67.1°F78.3°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 Old Saybrook 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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