Average sea water temperature in September:
+84.9°F
| Minimum sea water temperature in September: | 88.9°F |
| Maximum sea water temperature in September: | 77.2°F |
Daily 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.
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Monthly sea water temperature in Grand Isle, °F
Which USA resorts have warmest sea in September?
| Place name | September 2026 | September 2025 |
|---|---|---|
| Key West | 88.3°F | 86.9°F |
| Naples | 87.6°F | 86.1°F |
| Siesta Key | 87.5°F | 84.9°F |
| Sarasota | 87.5°F | 84.8°F |
| Houston | 87.2°F | 84.9°F |
| Cape Coral | 87.2°F | 85.2°F |
| Corpus Christi | 87.1°F | 85.8°F |
| Tampa | 86.9°F | 84.3°F |
| West Palm Beach | 86.8°F | 86.2°F |
| Clearwater Beach | 86.8°F | 84.0°F |
| New Orleans | 86.7°F | 84.3°F |
| Fort Lauderdale | 86.7°F | 86.4°F |
| Miami Beach | 86.4°F | 86.1°F |
| Pensacola Beach | 86.3°F | 83.9°F |
| Orange Beach | 86.3°F | 84.0°F |
| Panama City Beach | 86.2°F | 83.4°F |
| Pensacola | 86.2°F | 83.9°F |
| Fort Walton Beach | 86.2°F | 83.3°F |
| Destin | 86.1°F | 83.1°F |
| Santa Rosa Beach | 86.0°F | 83.4°F |
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: 01:02
September 23, wednesday
0300
84°F
W
4 mph
4 mph
0600
82°F
S
10 mph
10 mph
0900
82°F
SW
9 mph
9 mph
1200
86°F
W
5 mph
5 mph
1500
88°F
W
14 mph
14 mph
1800
86°F
W
12 mph
12 mph
2100
84°F
W
7 mph
7 mph
September 24, thursday
0000
84°F
W
6 mph
6 mph
