Measurements:
°C
°F
CURRENT WEATHER
13:27
Grand Isle
90°F
W 5 mph
Feels like: 98°F
Precip: 5%
World Resorts USA Grand Isle Weather

7 Day Weather Forecast

07.15
wed
DAY
90°F
W 5 mph
precip
5%
NIGHT
90°F
W 4 mph
precip
7%
07.16
thu
DAY
88°F
NW 7 mph
precip
5%
NIGHT
86°F
E 7 mph
precip
7%
07.17
fri
DAY
90°F
W 2 mph
precip
3%
NIGHT
88°F
E 13 mph
precip
7%
07.18
sat
DAY
92°F
S 3 mph
precip
7%
NIGHT
86°F
SE 12 mph
precip
5%
07.19
sun
DAY
92°F
SE 4 mph
precip
5%
NIGHT
86°F
E 11 mph
precip
17%
07.20
mon
DAY
92°F
N 4 mph
precip
4%
NIGHT
88°F
E 11 mph
precip
6%
07.21
tue
DAY
92°F
N 6 mph
precip
4%
NIGHT
88°F
E 12 mph
precip
7%

Grand Isle Sea Water Temperature in July, °F

Select Year: 2026 2025 2024

The average sea surface temperature in July 2026 for Grand Isle was 31.2°F. The maximum and minimum values were 30.5°F and 32.0°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:
July 5 days
August 4 days
September 4 days
The most windy months:
January 13 mph
April 13 mph
March 12 mph
more details