World sea water temperatures

Water temperature in Marathon Key (FL) in October

Is it warm enough to swim in Marathon Key in October? Average water temperature in Marathon Key in October is 82.9°F and therefore suitable for comfortable swimming. The warmest sea in Marathon Key in October is 87.1°F, and the coldest is 78.4°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Marathon Key

Changes water temperature in Marathon Key in October 2024, 2023

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

You can choose any other years:

Year 1:   Year 2:


Day 2024 2023 Min Max
October 186.2°F85.8°F82.9°F86.2°F
October 286.5°F86.2°F82.8°F86.5°F
October 387.1°F85.6°F82.9°F87.1°F
October 486.4°F85.1°F82.4°F86.4°F
October 586.5°F84.9°F82.4°F86.5°F
October 686°F85.3°F82°F86°F
October 785.5°F85.8°F81.9°F85.8°F
October 884.9°F85.6°F81.7°F85.6°F
October 984.6°F85.6°F81.3°F85.6°F
October 1083.7°F85.8°F81.5°F85.8°F
October 1183.8°F85.6°F82°F86°F
October 1283.7°F85.3°F81.9°F85.5°F
October 1383.5°F86.4°F81.9°F86.4°F
October 1483.1°F86°F81.7°F86°F
October 1583.5°F85.3°F81.3°F85.3°F
Day 2024 2023 Min Max
October 1683.1°F85.3°F81.3°F85.5°F
October 1782.6°F84°F81.3°F84.9°F
October 1882.4°F82.4°F81.3°F84.6°F
October 1982.2°F81.7°F81.1°F84°F
October 2081.5°F82.6°F80.6°F84.6°F
October 2181.1°F81.5°F79.7°F84.2°F
October 2280.8°F82°F79.7°F84.4°F
October 2380.8°F81.1°F80.1°F84.6°F
October 2481.1°F81.7°F80.1°F84.7°F
October 2582°F82°F79.5°F84.4°F
October 2682.2°F81.5°F79.3°F84°F
October 2782.6°F81°F79.2°F83.8°F
October 2882.4°F81°F79.5°F84°F
October 2981.1°F80.8°F79.2°F84.2°F
October 3080.8°F81°F78.6°F83.8°F
October 3181.1°F81.5°F78.4°F84.6°F
Marathon Key water temp chart in October

Average water temperature in Marathon Key in October over a decade

20152016201720182019
82.6°F82.6°F83.1°F83.1°F83.8°F
20202021202220232024
83.8°F84°F82.2°F83.7°F83.3°F

Marathon Key sea state in October

Chart comparing the height of waves in Marathon Key in October 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 Marathon Key in October

Marathon Key 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 October?

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

AvrMinMax
Vaca Key83.1°F78.6°F86.9°F
Cocoa Plum Beach83.1°F78.6°F86.9°F
Sombrero Beach83.3°F78.6°F86.7°F
Key Colony Beach83.3°F78.8°F86.5°F
Grassy Key83.3°F78.6°F86.4°F
Bahia Honda83.3°F78.8°F86.5°F
Duck Key83.3°F78.6°F86.4°F
Layton83.1°F78.3°F86.7°F
Big Pine Key83.1°F78.8°F86.5°F
Long Key83.3°F78.6°F86.4°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 Marathon Key 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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