In September warmest sea in USA is usually observed in the following locations: Key West, Islamorada, Key Largo.
Table below shows the average sea water temperature for marine resorts of USA in September for the last three years.
| Place name | September 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Key West | 86.9°F | 87.4°F | 87.3°F |
| Islamorada | 86.7°F | 87.3°F | 87.0°F |
| Key Largo | 86.6°F | 87.1°F | 86.7°F |
| Fort Lauderdale | 86.4°F | 86.4°F | 86.2°F |
| Everglades | 86.2°F | 87.0°F | 86.8°F |
| Miami Beach | 86.1°F | 86.3°F | 86.3°F |
| Naples | 86.1°F | 87.2°F | 86.8°F |
| Marco Island | 86.0°F | 87.2°F | 86.7°F |
| South Padre Island | 86.0°F | 85.8°F | 86.3°F |
| Corpus Christi | 85.8°F | 84.7°F | 87.1°F |
| Miami | 85.8°F | 86.0°F | 86.0°F |
| Cape Coral | 85.2°F | 86.5°F | 86.0°F |
| Houston | 84.9°F | 83.4°F | 86.1°F |
| Siesta Key | 84.9°F | 86.8°F | 85.8°F |
| Sarasota | 84.8°F | 86.7°F | 85.8°F |
| Cocoa Beach | 84.6°F | 85.2°F | 84.4°F |
| Tampa | 84.3°F | 86.0°F | 85.5°F |
| New Orleans | 84.3°F | 82.9°F | 85.1°F |
| Mobile | 84.0°F | 83.5°F | 84.6°F |
| Clearwater Beach | 84.0°F | 86.2°F | 85.5°F |
| Pensacola | 83.9°F | 84.2°F | 84.4°F |
| Panama City Beach | 83.4°F | 84.8°F | 85.1°F |
| Miramar Beach | 83.2°F | 84.6°F | 85.2°F |
| Destin | 83.1°F | 84.5°F | 85.0°F |
| Orlando | 82.8°F | 83.6°F | 83.4°F |
| Daytona Beach | 82.7°F | 83.2°F | 83.5°F |
| St. Augustine | 81.8°F | 82.7°F | 83.4°F |
| Princeville | 81.5°F | 79.4°F | 80.4°F |
| Kauai | 81.5°F | 79.4°F | 80.4°F |
| Jacksonville | 81.1°F | 82.0°F | 82.8°F |
| Kailua Kona | 80.9°F | 81.0°F | 80.5°F |
| Jekyll Island | 80.7°F | 81.9°F | 82.0°F |
| Honolulu | 80.6°F | 81.0°F | 80.2°F |
| Hawaii | 80.5°F | 80.8°F | 80.0°F |
| Maui | 79.9°F | 79.7°F | 79.4°F |
| Oahu | 79.8°F | 80.0°F | 79.6°F |
| Tybee Island | 79.8°F | 80.4°F | 82.0°F |
| Charleston (SC) | 78.8°F | 78.9°F | 82.2°F |
| Myrtle Beach | 78.6°F | 79.5°F | 80.6°F |
| Murrells Inlet | 78.4°F | 79.4°F | 80.6°F |
| Oak Island | 78.4°F | 79.1°F | 80.9°F |
| Bald Head Island | 78.3°F | 78.8°F | 80.7°F |
| Carolina Beach | 78.0°F | 78.4°F | 79.9°F |
| Wilmington (NC) | 78.0°F | 78.3°F | 80.1°F |
| Hatteras Island | 75.4°F | 75.8°F | 78.8°F |
| Washington | 74.7°F | 75.2°F | 77.2°F |
| Norfolk | 74.2°F | 76.6°F | 78.7°F |
| Tangier Island | 73.8°F | 74.9°F | 77.3°F |
| Virginia Beach | 73.8°F | 73.9°F | 76.4°F |
| Ocean City (MD) | 72.9°F | 71.6°F | 74.4°F |
| Chincoteague | 72.9°F | 72.4°F | 75.0°F |
| Lewes | 72.5°F | 71.6°F | 74.2°F |
| Cape May | 72.2°F | 71.4°F | 73.9°F |
| Ocean City (NJ) | 71.7°F | 71.2°F | 73.3°F |
| Atlantic City | 71.6°F | 71.3°F | 73.1°F |
| Stamford | 71.3°F | 71.7°F | 72.4°F |
| Cleveland | 71.3°F | 72.1°F | 72.1°F |
| New York | 71.2°F | 70.6°F | 72.2°F |
| Jersey City | 71.2°F | 70.6°F | 72.2°F |
| Santa Catalina Island | 70.6°F | 69.2°F | 69.6°F |
| Los Angeles | 70.6°F | 68.8°F | 68.9°F |
| Beverly Hills | 70.4°F | 68.7°F | 68.4°F |
| Hollywood | 70.4°F | 68.7°F | 68.4°F |
| Santa Monica | 70.3°F | 68.6°F | 68.4°F |
| Bristol | 69.6°F | 68.7°F | 70.8°F |
| San Jose | 69.5°F | 68.5°F | 68.6°F |
| Newport Beach | 69.5°F | 68.2°F | 68.0°F |
| Malibu | 69.5°F | 66.8°F | 67.9°F |
| Irvine | 69.4°F | 68.3°F | 67.9°F |
| Montauk | 68.7°F | 67.4°F | 68.7°F |
| Anaheim | 68.6°F | 67.2°F | 67.2°F |
| Santa Barbara | 68.5°F | 65.4°F | 66.6°F |
| Laguna Beach | 68.5°F | 68.6°F | 68.1°F |
| Buffalo (NY) | 68.0°F | 69.8°F | 69.7°F |
| Martha's Vineyard | 67.9°F | 66.0°F | 69.5°F |
| Oshkosh | 67.8°F | 70.4°F | 68.7°F |
| Nantucket | 67.7°F | 66.3°F | 68.3°F |
| Holland | 67.6°F | 68.8°F | 67.1°F |
| Appleton | 67.5°F | 70.3°F | 68.9°F |
| Long Beach (CA) | 67.5°F | 65.9°F | 66.3°F |
| San Diego | 67.3°F | 69.2°F | 67.5°F |
| Oakland | 67.1°F | 65.3°F | 66.7°F |
| Green Bay | 67.1°F | 69.8°F | 67.7°F |
| Niagara Falls | 66.4°F | 68.2°F | 68.5°F |
| South Lake Tahoe | 65.9°F | 64.3°F | 64.9°F |
| Lake Tahoe | 65.9°F | 64.2°F | 64.9°F |
| Yosemite | 65.6°F | 65.6°F | 65.6°F |
| Provincetown | 65.1°F | 64.6°F | 65.6°F |
| Chicago | 65.0°F | 71.6°F | 69.6°F |
| San Francisco | 64.8°F | 63.0°F | 64.7°F |
| Boston | 63.7°F | 64.4°F | 65.7°F |
| Mackinac Island | 61.9°F | 64.5°F | 61.9°F |
| Duluth | 60.7°F | 65.3°F | 64.8°F |
| Monterey | 60.7°F | 57.3°F | 60.6°F |
| Whidbey Island | 58.4°F | 58.3°F | 57.3°F |
| Sitka | 54.8°F | 53.4°F | 54.7°F |
| Florence | 54.1°F | 54.4°F | 53.5°F |
| Anchorage | 53.8°F | 52.6°F | 52.2°F |
| Juneau | 53.4°F | 50.8°F | 52.2°F |
| Homer | 51.8°F | 51.2°F | 51.3°F |
Charts below show average sea water temperature for USA resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of USA resorts at that time.
Places in USA:
Name
°F
