World sea water temperatures

Water temperature in Grand Isle (LA) in August

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Is it warm enough to swim in Grand Isle in August? Average water temperature in Grand Isle in August is 86.7°F and therefore suitable for comfortable swimming. The warmest sea in Grand Isle in August is 91.8°F, and the coldest is 82.4°F. Average high air temperature in Grand Isle in August is 90°F, and average low temperature is 76°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Grand Isle

Changes water temperature in Grand Isle in August 2025, 2024

To get an accurate forecast for the water temperature in Grand Isle for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Grand Isle, 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 189.1°F91.2°F84.6°F91.2°F
August 288.3°F90.9°F84.2°F90.9°F
August 388°F90.9°F84.2°F90.9°F
August 487.8°F90.7°F84.4°F91.4°F
August 587.8°F91°F84°F91.6°F
August 688.2°F91°F84°F91°F
August 788.3°F91.4°F84.2°F91.4°F
August 888.3°F90.3°F84.4°F90.3°F
August 988°F88.9°F83.3°F88.9°F
August 1086°F88.9°F83.5°F89.4°F
August 1186.5°F89.4°F83.7°F89.4°F
August 1286.4°F90.5°F83.7°F90.5°F
August 1386.7°F90.7°F83.5°F90.7°F
August 1487.8°F91.8°F83.1°F91.8°F
August 1586.7°F90.9°F83.3°F90.9°F
Day 2025 2024 Min Max
August 1686.9°F90.9°F83.1°F90.9°F
August 1787.8°F90.7°F83.1°F90.7°F
August 1887.8°F91.2°F82.9°F91.2°F
August 1988.9°F91.6°F83.3°F91.6°F
August 2088.9°F89.6°F83.7°F90.3°F
August 2190°F89.4°F84.9°F90°F
August 2290.1°F89.2°F85.1°F90.1°F
August 2389.6°F88.5°F85.3°F89.6°F
August 2489.1°F87.3°F84.6°F89.8°F
August 2588.2°F86.9°F84.7°F89.8°F
August 2687.3°F86.7°F82.4°F89.6°F
August 2787.3°F86.4°F83.1°F90.9°F
August 2887.1°F86.4°F83.3°F90.3°F
August 2986°F86.2°F83.8°F89.6°F
August 3086.7°F85.1°F83.8°F88.9°F
August 3186.5°F84.9°F83.5°F88.9°F
Grand Isle water temp chart in August

Average water temperature in Grand Isle in August over a decade

20162017201820192020
86.5°F86°F86.5°F86.4°F86.9°F
20212022202320242025
88.2°F85.5°F89.6°F89.2°F88.2°F

Grand Isle sea state in August

Chart comparing the height of waves in Grand Isle 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 Grand Isle in August

Weather and climate in Grand Isle in August

This data display average monthly climate indicators in Grand Isle 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 temperature90°F
  • Average LOW temperature76°F
  • Average rainfall198mm/7.8''

Grand Isle 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

Temperature in neighboring cities

The nearest locations with the average water temperature in August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Buras86.5°F81.7°F91.4°F
Cocodrie86.9°F82.4°F91.6°F
Boothville86°F80.4°F90.5°F
Shell Beach86.2°F81.3°F90.7°F
Venice86°F80.4°F90.1°F
Mandeville86.4°F81.9°F90.7°F
Chandeleur Islands86°F80.1°F90.3°F
Waveland86°F81.3°F90.3°F
Bay Saint Louis86°F81.3°F90.3°F
Gulfport85.8°F81.5°F89.6°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 Grand Isle 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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