28.12
sun
sun
Day
68°F
N 12 mph
Precip.
0%
0%
Night
68°F
NE 9 mph
Precip.
0%
0%
29.12
mon
mon
Day
55°F
S 26 mph
Precip.
0%
0%
Night
52°F
S 22 mph
Precip.
0%
0%
30.12
tue
tue
Day
46°F
S 16 mph
Precip.
0%
0%
Night
48°F
S 17 mph
Precip.
0%
0%
31.12
wed
wed
Day
48°F
SW 6 mph
Precip.
0%
0%
Night
52°F
E 6 mph
Precip.
100%
100%
01.01
thu
thu
Day
57°F
SE 4 mph
Precip.
0%
0%
Night
59°F
SE 9 mph
Precip.
0%
0%
02.01
fri
fri
Day
57°F
SW 15 mph
Precip.
0%
0%
Night
55°F
W 13 mph
Precip.
0%
0%
03.01
sat
sat
Day
59°F
W 16 mph
Precip.
0%
0%
Night
64°F
NW 14 mph
Precip.
45%
45%
sea water
temperature
temperature
| Grand Isle |
monthly
weather
weather
| Grand Isle |
current
weather
weather
| Grand Isle |
14 days
forecast
forecast
| Grand Isle |
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 65.5°F. The highest and lowest sea temperatures during the month were 70.5°F and 61.3°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 61.0°F. The highest and lowest sea temperatures during the month were 67.6°F and 56.7°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
Grand Isle on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Grand Isle
Local time: 15:17
December 28, sunday
1800
68°F
N
12 mph
12 mph
2100
68°F
NE
11 mph
11 mph
December 29, monday
0000
68°F
NE
9 mph
9 mph
0300
66°F
NE
8 mph
8 mph
0600
66°F
E
8 mph
8 mph
0900
59°F
S
30 mph
30 mph
1200
55°F
S
26 mph
26 mph
1500
54°F
S
24 mph
24 mph
