World Resorts USA Grand Isle Weather

Grand Isle 7 Days Forecast

12.08
wed
Day
86°F
NE 11 mph
Precip.
8%
Night
86°F
NE 14 mph
Precip.
7%
13.08
thu
Day
88°F
NE 11 mph
Precip.
4%
Night
84°F
NE 12 mph
Precip.
8%
14.08
fri
Day
88°F
NW 6 mph
Precip.
4%
Night
84°F
NE 9 mph
Precip.
5%
15.08
sat
Day
86°F
W 4 mph
Precip.
6%
Night
86°F
NE 7 mph
Precip.
7%
16.08
sun
Day
86°F
N 1 mph
Precip.
17%
Night
82°F
NE 6 mph
Precip.
8%
17.08
mon
Day
88°F
NE 6 mph
Precip.
4%
Night
84°F
NE 12 mph
Precip.
7%
18.08
tue
Day
88°F
NE 7 mph
Precip.
5%
Night
84°F
E 13 mph
Precip.
9%

Sea water temperature in August, °F

Show year:
2025
2024
2023

The average sea water temperature in August of 2025 was 87.9°F. The highest and lowest sea temperatures during the month were 90.1°F and 86.0°F.

Air temperature in Grand Isle, °F

Precipitation total in Grand Isle, in.

* Charts above show average data for the last 3 years.

Best time for vacation in Grand Isle

Sunniest months:
October 18 days
September 15 days
November 14 days
Warmest months:
August 85.8 °F
July 85.4 °F
June 83.7 °F
Warmest sea temp:
August 88.0 °F
July 87.2 °F
June 85.1 °F
Coldest months:
January 58.3 °F
February 60.8 °F
December 62.4 °F
Rainiest months:
August 4 days
July 4 days
September 4 days
Windiest months:
January 13.2 mph
April 13.2 mph
March 12.9 mph

Grand Isle on a weather map

Current weather
22:25
Grand Isle
+86°F
NE 11 mph
Feels like: +97°F
Precip.: 7%
Places in USA:
Name
°F
Boston
+72°F
Washington
+81°F
Hawaii
+79°F
Las Vegas
+90°F
Los Angeles
+70°F
Miami
+79°F
Maui
+75°F
Myrtle Beach
+79°F
New York
+75°F
San Diego
+72°F
San Francisco
+57°F
Santa Monica
+68°F
Sarasota
+79°F
Houston
+82°F
Chicago
+72°F
all places
24 Hours Forecast
Grand Isle
Local time: 22:25
August 13, thursday
0000
86°F
NE
14 mph
0300
86°F
NE
14 mph
0600
84°F
NE
12 mph
0900
86°F
NE
13 mph
1200
88°F
NE
11 mph
1500
90°F
NE
12 mph
1800
86°F
NE
15 mph
2100
86°F
NE
14 mph
Units of measurement: °C / °F