Measurements:
°C
°F
CURRENT WEATHER
16:43
Grand Isle
92°F
N 11 mph
Feels like: 104°F
Precip: 7%
World Resorts USA Grand Isle Weather

7 Day Weather Forecast

08.25
tue
DAY
88°F
S 7 mph
precip
7%
NIGHT
88°F
NE 8 mph
precip
5%
08.26
wed
DAY
90°F
N 6 mph
precip
26%
NIGHT
88°F
NE 11 mph
precip
6%
08.27
thu
DAY
90°F
N 5 mph
precip
14%
NIGHT
88°F
NE 8 mph
precip
17%
08.28
fri
DAY
82°F
W 17 mph
precip
85%
NIGHT
86°F
N 6 mph
precip
20%
08.29
sat
DAY
86°F
NW 4 mph
precip
10%
NIGHT
86°F
NW 10 mph
precip
28%
08.30
sun
DAY
88°F
NW 9 mph
precip
40%
NIGHT
88°F
NW 11 mph
precip
6%
08.31
mon
DAY
88°F
W 6 mph
precip
5%
NIGHT
88°F
N 7 mph
precip
6%

Grand Isle Sea Water Temperature in August, °F

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Grand Isle was 31.0°F. The maximum and minimum values were 29.1°F and 32.6°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