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Water temperature in Key Biscayne (FL) in August

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Is it warm enough to swim in Key Biscayne in August? Average water temperature in Key Biscayne in August is 86.4°F and therefore suitable for comfortable swimming. The warmest sea in Key Biscayne in August is 89.6°F, and the coldest is 83.1°F. Average high air temperature in Key Biscayne in August is 88°F, and average low temperature is 78°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Key Biscayne

Changes water temperature in Key Biscayne in August 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
August 188°F87.6°F84.9°F88°F
August 288°F87.6°F84.7°F88°F
August 388.7°F86.9°F84.7°F88.7°F
August 488.2°F86.7°F84.7°F88.2°F
August 588.5°F87.1°F85.3°F88.7°F
August 688.5°F86.7°F85.1°F89.1°F
August 788°F86.4°F84.6°F88.7°F
August 888°F86.5°F84.7°F88.9°F
August 987.8°F86.2°F85.3°F89.6°F
August 1088°F87.1°F85.1°F88.7°F
August 1187.3°F86.9°F85.3°F89.4°F
August 1287.1°F86.9°F85.5°F89.1°F
August 1387.3°F87.6°F85.5°F89.1°F
August 1487.1°F88.9°F85.5°F88.9°F
August 1587.8°F88.2°F85.5°F88.3°F
Day 2025 2024 Min Max
August 1687.8°F87.6°F85.6°F88°F
August 1788.2°F87.4°F85.6°F88.2°F
August 1887.8°F86.7°F85.1°F88.5°F
August 1988.3°F86.7°F84.6°F88.3°F
August 2087.8°F86.7°F84.6°F87.8°F
August 2187.8°F86.7°F83.1°F87.8°F
August 2287.8°F86.9°F83.1°F87.8°F
August 2387.6°F86.7°F83.5°F87.6°F
August 2487.8°F86.2°F84.6°F87.8°F
August 2587.4°F86.4°F85.3°F87.4°F
August 2687.6°F87.4°F84.7°F87.6°F
August 2788.7°F86.5°F84°F88.7°F
August 2888.2°F86.4°F83.5°F88.2°F
August 2988°F86.4°F83.5°F88°F
August 3087.6°F85.8°F83.7°F87.6°F
August 3187.6°F86°F83.8°F87.6°F
Key Biscayne water temp chart in August

Average water temperature in Key Biscayne in August over a decade

20162017201820192020
86.2°F86.4°F85.8°F86.5°F86.2°F
20212022202320242025
86.4°F86.5°F88°F86.9°F88.2°F

Key Biscayne sea state in August

Chart comparing the height of waves in Key Biscayne in August 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 Key Biscayne in August

Weather and climate in Key Biscayne in August

This data display average monthly climate indicators in Key Biscayne in August based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature88°F
  • Average LOW temperature78°F
  • Average rainfall days15 days
  • Average rainfall160mm/6.3''

Key Biscayne 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 August?

Want to know where the water temperature in August 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

Best Beach Resorts in Florida in August

Places with the warmest average sea water temperature in Florida in August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Sarasota86.9°F83.7°F91.2°F
Key West86.7°F83.3°F90°F
Naples87.1°F83.8°F90°F
Miami Beach86.2°F82.9°F89.2°F
Fort Myers Beach86.9°F83.8°F90.3°F
Destin85.5°F81.1°F89.4°F
Fort Lauderdale86°F82.6°F88.2°F
Key Largo86.5°F82.4°F90°F
Cocoa Beach82.8°F77.4°F86.2°F
Clearwater Beach86.7°F83.5°F91.6°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 Key Biscayne 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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