Measurements:
°C
°F
CURRENT WEATHER
14:15
Grand Isle
90°F
N 11 mph
Feels like: 100°F
Precip: 6%
World Resorts USA Grand Isle Weather

7 Day Weather Forecast

08.05
wed
DAY
88°F
NW 5 mph
precip
8%
NIGHT
88°F
N 9 mph
precip
6%
08.06
thu
DAY
88°F
NW 8 mph
precip
5%
NIGHT
88°F
NW 9 mph
precip
5%
08.07
fri
DAY
88°F
NW 7 mph
precip
6%
NIGHT
88°F
W 10 mph
precip
8%
08.08
sat
DAY
88°F
NW 7 mph
precip
6%
NIGHT
88°F
NW 9 mph
precip
10%
08.09
sun
DAY
86°F
W 6 mph
precip
48%
NIGHT
88°F
NW 11 mph
precip
11%
08.10
mon
DAY
88°F
NW 11 mph
precip
36%
NIGHT
88°F
N 9 mph
precip
15%
08.11
tue
DAY
88°F
NW 9 mph
precip
18%
NIGHT
88°F
N 11 mph
precip
10%

Grand Isle Sea Water Temperature in August, °F

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Grand Isle was 31.1°F. The maximum and minimum values were 30.0°F and 32.3°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 89.0 °F
The most cold months:
January 59.3 °F
February 62.0 °F
December 63.8 °F
The most rainy months:
August 4 days
July 4 days
September 4 days
The most windy months:
January 13 mph
April 13 mph
March 12 mph
more details