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Water temperature in Jacksonville (FL) in September

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Is it warm enough to swim in Jacksonville in September? Average water temperature in Jacksonville in September is 82.4°F and therefore suitable for comfortable swimming. The warmest sea in Jacksonville in September is 86°F, and the coldest is 77.9°F. Average high air temperature in Jacksonville in September is 87°F, and average low temperature is 70°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Jacksonville

Changes water temperature in Jacksonville in September 2025, 2024

To get an accurate forecast for the water temperature in Jacksonville for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Jacksonville, 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 184°F85.5°F81.3°F85.5°F
September 283.1°F85.5°F79.9°F85.5°F
September 382°F84.7°F80.8°F85.1°F
September 481.5°F84.4°F80.8°F85.1°F
September 5 84.2°F80.2°F85.5°F
September 6 84°F80.6°F85.8°F
September 7 83.7°F81°F85.5°F
September 8 83.5°F81.3°F85.1°F
September 9 83.3°F81.3°F84.7°F
September 10 82.9°F81°F84.7°F
September 11 82.8°F80.8°F84.7°F
September 12 82.6°F80.4°F84.9°F
September 13 81°F80.2°F84.6°F
September 14 80.8°F80.4°F84.9°F
September 15 80.6°F80.2°F84.9°F
Day 2025 2024 Min Max
September 16 80.8°F80.8°F84.9°F
September 17 80.1°F80.1°F84.7°F
September 18 80.4°F80.4°F84.6°F
September 19 80.2°F80.2°F84.7°F
September 20 80.6°F80.6°F84.7°F
September 21 81.1°F80.2°F84.7°F
September 22 81.1°F80.1°F84.4°F
September 23 81.3°F79.9°F84.6°F
September 24 81.9°F79.3°F84.6°F
September 25 81.7°F78.4°F84.7°F
September 26 81.5°F77.9°F84.7°F
September 27 81.7°F78.1°F86°F
September 28 81.7°F78.3°F84.9°F
September 29 82.2°F78.4°F84.6°F
September 30 82°F78.4°F84.6°F
Jacksonville water temp chart in September

Average water temperature in Jacksonville in September over a decade

20152016201720182019
82.2°F82.8°F82°F84.4°F82.6°F
20202021202220232024
83.3°F81.9°F83.1°F82.9°F82.2°F

Jacksonville sea state in September

Chart comparing the height of waves in Jacksonville 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 Jacksonville in September

Weather and climate in Jacksonville in September

This data display average monthly climate indicators in Jacksonville in September 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 temperature87°F
  • Average LOW temperature70°F
  • Average humidity
    81
  • Average rainfall days12 days
  • Average rainfall208mm/8.2''
  • Average daylight12h
  • Average sunshine7.6h
  • Average UV index9

Jacksonville 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

Best Beach Resorts in Florida in September

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

AvrMinMax
Sarasota85.5°F81.3°F88.2°F
Key West85.6°F82.9°F88.7°F
Naples85.8°F82°F89.2°F
Miami Beach85.5°F83.1°F89.1°F
Fort Myers Beach85.6°F81.7°F88.5°F
Destin83.8°F79.3°F87.8°F
Fort Lauderdale85.3°F83.1°F88.3°F
Key Largo85.6°F82.4°F88.3°F
Cocoa Beach83.5°F80.6°F86.4°F
Clearwater Beach84.9°F80.8°F88°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 Jacksonville 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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