Average sea water temperature in September:
+84.7°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:
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.
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Monthly sea water temperature in Grand Isle, °F
Which USA resorts have warmest sea in September?
| Place name | September 2025 | September 2024 |
|---|---|---|
| Key West | 86.9°F | 87.4°F |
| Islamorada | 86.7°F | 87.3°F |
| Key Largo | 86.6°F | 87.1°F |
| Fort Lauderdale | 86.4°F | 86.4°F |
| Everglades | 86.2°F | 87.0°F |
| Miami Beach | 86.1°F | 86.3°F |
| Naples | 86.1°F | 87.2°F |
| Marco Island | 86.0°F | 87.2°F |
| South Padre Island | 86.0°F | 85.8°F |
| Corpus Christi | 85.8°F | 84.7°F |
| Miami | 85.8°F | 86.0°F |
| Cape Coral | 85.2°F | 86.5°F |
| Houston | 84.9°F | 83.4°F |
| Siesta Key | 84.9°F | 86.8°F |
| Sarasota | 84.8°F | 86.7°F |
| Cocoa Beach | 84.6°F | 85.2°F |
| Tampa | 84.3°F | 86.0°F |
| New Orleans | 84.3°F | 82.9°F |
| Mobile | 84.0°F | 83.5°F |
| Clearwater Beach | 84.0°F | 86.2°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: 22:02
December 05, friday
0000
63°F
SE
10 mph
10 mph
0300
59°F
S
14 mph
14 mph
0600
57°F
S
12 mph
12 mph
0900
54°F
S
14 mph
14 mph
1200
54°F
S
10 mph
10 mph
1500
57°F
S
12 mph
12 mph
1800
59°F
SW
12 mph
12 mph
2100
57°F
SW
11 mph
11 mph
