The highest day temperature in March 2026 was 76°F. The lowest night temperature was 49°F. The average values for day and night temperatures during March were 68.9°F и 68.5°F respectivly.

The average sea surface temperature in March 2026 for Grand Isle was 73.0°F. The maximum and minimum values were 67.0°F and 77.8°F respectively.

Most of the days in March are sunny but you can also expect cloudy and gloomy days.

Precipitation total in March for Grand Isle is 1.0 in.

The average wind speed in March is 12.9 mph. It makes March one of the most windy months of the year for Grand Isle.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Grand Isle in March is 7.2 hours.