02.09
wed
wed
Day
86°F
NW 6 mph
Precip.
19%
19%
Night
84°F
N 2 mph
Precip.
6%
6%
03.09
thu
thu
Day
82°F
W 5 mph
Precip.
30%
30%
Night
84°F
NE 5 mph
Precip.
5%
5%
04.09
fri
fri
Day
84°F
NW 5 mph
Precip.
15%
15%
Night
84°F
N 7 mph
Precip.
7%
7%
05.09
sat
sat
Day
86°F
NW 5 mph
Precip.
4%
4%
Night
82°F
E 9 mph
Precip.
8%
8%
06.09
sun
sun
Day
88°F
S 4 mph
Precip.
5%
5%
Night
82°F
E 11 mph
Precip.
18%
18%
07.09
mon
mon
Day
88°F
E 7 mph
Precip.
5%
5%
Night
84°F
NE 13 mph
Precip.
16%
16%
08.09
tue
tue
Day
86°F
NE 9 mph
Precip.
30%
30%
Night
84°F
NE 11 mph
Precip.
18%
18%
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 September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 85.2°F. The highest and lowest sea temperatures during the month were 88.2°F and 83.8°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: 10:51
September 02, wednesday
1200
86°F
NW
6 mph
6 mph
1500
86°F
NW
8 mph
8 mph
1800
86°F
NW
10 mph
10 mph
2100
84°F
N
4 mph
4 mph
September 03, thursday
0000
84°F
N
2 mph
2 mph
0300
84°F
N
1 mph
1 mph
0600
82°F
SW
4 mph
4 mph
0900
82°F
SW
3 mph
3 mph
