World sea water temperatures

Water temperature in Grand Isle (LA) in May

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Is it warm enough to swim in Grand Isle in May? Average water temperature in Grand Isle in May is 79°F and therefore suitable for comfortable swimming. The warmest sea in Grand Isle in May is 85.8°F, and the coldest is 71.6°F. Average high air temperature in Grand Isle in May is 84°F, and average low temperature is 69°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 May 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 May.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
May 180.1°F77°F72.9°F80.1°F
May 279.9°F76.1°F73°F79.9°F
May 379°F78.1°F73.4°F79.5°F
May 479.2°F78.3°F72.7°F81.5°F
May 578.8°F78.1°F72.3°F80.2°F
May 678.8°F79.5°F71.6°F80.2°F
May 776.8°F79.5°F72°F80.6°F
May 877.2°F79.9°F72.9°F82.4°F
May 975.6°F81.3°F73.6°F81.7°F
May 1076.3°F81.5°F73.9°F82°F
May 1176.3°F80.4°F73.8°F81.3°F
May 1277°F80.1°F72.5°F80.6°F
May 1377.2°F79°F73°F81.9°F
May 1476.5°F79.2°F73.6°F81.3°F
May 1579°F78.3°F73.8°F81.9°F
Day 2025 2024 Min Max
May 1676.8°F79.5°F75.4°F83.1°F
May 1780.1°F79°F75.6°F82.8°F
May 1882.4°F78.4°F75.7°F82.6°F
May 1983.1°F80.6°F75.7°F83.7°F
May 2082.8°F82°F75.7°F83.7°F
May 2183.5°F81.9°F75.7°F84.6°F
May 2283.7°F81.1°F75.6°F84.7°F
May 2383.3°F81.1°F76.1°F84.7°F
May 2483.8°F81.9°F76.5°F84.4°F
May 2585.1°F81.5°F76.8°F85.1°F
May 2685.5°F82.4°F77°F85.5°F
May 2785.3°F83.7°F77.4°F85.3°F
May 2885.3°F83.5°F78.6°F85.3°F
May 2985.6°F84.2°F78.6°F85.6°F
May 3084.7°F85.6°F78.1°F85.6°F
May 3185.1°F83.7°F77.9°F85.8°F
Grand Isle water temp chart in May

Average water temperature in Grand Isle in May over a decade

20162017201820192020
79°F77.7°F81.1°F79.7°F77.9°F
20212022202320242025
78.3°F81.3°F80.4°F80.6°F80.8°F

Grand Isle sea state in May

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

Weather and climate in Grand Isle in May

This data display average monthly climate indicators in Grand Isle in May 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 temperature84°F
  • Average LOW temperature69°F
  • Average rainfall97mm/3.8''

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 May?

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

AvrMinMax
Buras78.1°F70.7°F84.2°F
Cocodrie79.3°F71.4°F86.4°F
Boothville76.8°F68.9°F83.7°F
Shell Beach78.6°F70°F84.7°F
Venice76.8°F68.5°F83.5°F
Mandeville78.4°F69.8°F86°F
Chandeleur Islands78.3°F70.3°F84.7°F
Waveland78.1°F69.6°F84.4°F
Bay Saint Louis78.1°F69.6°F84.6°F
Gulfport78.3°F69.8°F84.6°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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