World Resorts USA Grand Isle Weather

Grand Isle 14 Days Forecast

23.09
wed
Day
86°F
W 5 mph
Precip.
4%
Night
84°F
W 6 mph
Precip.
7%
24.09
thu
Day
86°F
W 6 mph
Precip.
14%
Night
82°F
W 14 mph
Precip.
22%
25.09
fri
Day
82°F
W 14 mph
Precip.
4%
Night
81°F
NW 14 mph
Precip.
15%
26.09
sat
Day
81°F
NW 6 mph
Precip.
14%
Night
81°F
NW 8 mph
Precip.
14%
27.09
sun
Day
79°F
W 7 mph
Precip.
16%
Night
81°F
NW 11 mph
Precip.
4%
28.09
mon
Day
81°F
NW 11 mph
Precip.
15%
Night
82°F
NW 14 mph
Precip.
4%
29.09
tue
Day
82°F
NW 9 mph
Precip.
36%
Night
82°F
N 16 mph
Precip.
41%
30.09
wed
Day
81°F
NE 14 mph
Precip.
68%
Night
81°F
NE 11 mph
Precip.
65%
01.10
thu
Day
81°F
W 6 mph
Precip.
11%
Night
81°F
W 6 mph
Precip.
24%
02.10
fri
Day
81°F
SW 16 mph
Precip.
5%
Night
79°F
SW 12 mph
Precip.
5%
03.10
sat
Day
79°F
SW 12 mph
Precip.
1%
Night
79°F
S 8 mph
Precip.
1%
04.10
sun
Day
79°F
W 6 mph
Precip.
2%
Night
79°F
NW 7 mph
Precip.
6%
05.10
mon
Day
77°F
W 7 mph
Precip.
4%
Night
81°F
NW 12 mph
Precip.
15%

Sea water temperature in September, °F

Show year:
2026
2025
2024

The average sea water temperature in September of 2026 was 86.9°F. The highest and lowest sea temperatures during the month were 88.3°F and 85.5°F.

Sea water temperature in October, °F

Show year:
2025
2024
2023

The average sea water temperature in October of 2025 was 80.1°F. The highest and lowest sea temperatures during the month were 84.7°F and 76.5°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 85.7 °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
00:24
Grand Isle
+84°F
NW 9 mph
Feels like: +91°F
Precip.: 6%
Places in USA:
Name
°F
Boston
+57°F
Washington
+59°F
Hawaii
+79°F
Las Vegas
+84°F
Los Angeles
+72°F
Miami
+82°F
Maui
+66°F
New York
+61°F
Panama City Beach
+77°F
San Diego
+70°F
San Francisco
+59°F
Santa Monica
+70°F
Sarasota
+79°F
Houston
+84°F
Chicago
+59°F
all places
24 Hours Forecast
Grand Isle
Local time: 00:24
September 23, wednesday
0300
84°F
W
4 mph
0600
82°F
S
10 mph
0900
82°F
SW
9 mph
1200
86°F
W
5 mph
1500
88°F
W
14 mph
1800
86°F
W
12 mph
2100
84°F
W
7 mph
September 24, thursday
0000
84°F
W
6 mph
Units of measurement: °C / °F