Measurements:
°C
°F
CURRENT WEATHER
11:13
Grand Isle
80°F
SW 3 mph
Feels like: 82°F
Precip: 0%
World Resorts USA Grand Isle Weather

7 Day Weather Forecast

05.14
thu
DAY
80°F
SW 3 mph
precip
0%
NIGHT
80°F
NE 7 mph
precip
0%
05.15
fri
DAY
78°F
NW 11 mph
precip
0%
NIGHT
78°F
NW 11 mph
precip
0%
05.16
sat
DAY
80°F
NW 14 mph
precip
0%
NIGHT
80°F
NW 16 mph
precip
0%
05.17
sun
DAY
80°F
NW 17 mph
precip
100%
NIGHT
80°F
NW 16 mph
precip
0%
05.18
mon
DAY
80°F
NW 19 mph
precip
0%
NIGHT
80°F
NW 14 mph
precip
0%
05.19
tue
DAY
82°F
NW 14 mph
precip
0%
NIGHT
80°F
NW 11 mph
precip
0%
05.20
wed
DAY
82°F
NW 12 mph
precip
100%
NIGHT
80°F
NW 4 mph
precip
100%

Grand Isle Sea Water Temperature in May, °F

Select Year: 2025 2024 2023

The average sea surface temperature in May 2025 for Grand Isle was 27.3°F. The maximum and minimum values were 24.7°F and 29.8°F respectively.

Grand Isle on the Weather Map

Best Time to Visit Grand Isle
The most sunny months:
October 18 days
September 15 days
November 14 days
The most warm months:
August 89.8 °F
July 89.3 °F
June 87.5 °F
Warmest sea temperature:
August 92.2 °F
July 91.3 °F
June 88.9 °F
The most cold months:
January 59.3 °F
February 62.0 °F
December 63.8 °F
The most rainy months:
July 5 days
June 4 days
August 4 days
The most windy months:
January 13 mph
April 13 mph
March 12 mph
more details