World sea water temperatures

Water temperature in Marquesas Keys (FL) in September

Is it warm enough to swim in Marquesas Keys in September? Average water temperature in Marquesas Keys in September is 85.8°F and therefore suitable for comfortable swimming. The warmest sea in Marquesas Keys in September is 89.2°F, and the coldest is 83.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Marquesas Keys

Changes water temperature in Marquesas Keys in September 2025, 2024

To get an accurate forecast for the water temperature in Marquesas Keys for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Marquesas Keys, 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 188°F86.9°F83.7°F88.2°F
September 288°F85.8°F83.8°F88°F
September 387.8°F86.5°F84°F88°F
September 487.3°F86.2°F84.2°F87.8°F
September 586.4°F86.4°F84.6°F88.3°F
September 686.5°F87.4°F84.6°F87.8°F
September 786.4°F87.6°F84.7°F88°F
September 886.9°F87.3°F84.7°F88°F
September 986.9°F88°F84.7°F88°F
September 1087.3°F88°F84.7°F88°F
September 1187.4°F88.2°F83.7°F88.2°F
September 1287.4°F88.3°F83.1°F88.3°F
September 1387.1°F88.3°F83.3°F88.3°F
September 1487.1°F89.2°F83.7°F89.2°F
September 1587.1°F89.1°F83.7°F89.1°F
Day 2025 2024 Min Max
September 1687.3°F89.2°F83.7°F89.2°F
September 1786.7°F88.5°F84°F88.5°F
September 1886.4°F88.3°F84°F88.9°F
September 1985.8°F88.5°F84°F88.7°F
September 2085.8°F87.8°F84.2°F88.2°F
September 2186°F88.5°F83.8°F88.5°F
September 2286°F88.5°F83.8°F88.5°F
September 2386.2°F88.2°F83.5°F88.2°F
September 2486°F87.8°F83.5°F87.8°F
September 2586.2°F87.1°F83.7°F87.4°F
September 26 86.5°F83.1°F87.1°F
September 27 85.8°F83.5°F86.9°F
September 28 86.4°F83.7°F86.7°F
September 29 86.2°F83.3°F86.4°F
September 30 86.2°F83.5°F86.4°F
Marquesas Keys water temp chart in September

Average water temperature in Marquesas Keys in September over a decade

20152016201720182019
86.5°F85.3°F85.8°F85.1°F85.3°F
20202021202220232024
86.2°F86.4°F87.1°F87.3°F87.6°F

Marquesas Keys sea state in September

Chart comparing the height of waves in Marquesas Keys 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 Marquesas Keys in September

Marquesas Keys 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
Smathers Beach85.6°F82.9°F88.7°F
Big Coppitt Key85.8°F82.8°F90°F
Geiger Beach85.6°F82.9°F88.9°F
Sugarloaf Key85.8°F82.8°F89.4°F
Cudjoe Key85.8°F82.8°F89.1°F
Florida Keys85.8°F82.8°F88.9°F
Summerland Key85.8°F82.8°F88.9°F
Ramrod Key85.8°F82.8°F88.9°F
Little Torch Key85.8°F82.8°F88.9°F
Looe Key85.6°F82.9°F88.3°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 Marquesas Keys 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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