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 |
| West Palm Beach | 86.2°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 |
| Sanibel Island | 85.7°F | 87.0°F | 86.4°F |
| Galveston Island | 85.5°F | 84.4°F | 86.6°F |
| Galveston | 85.5°F | 83.7°F | 86.5°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 |
| St. Petersburg | 84.1°F | 86.1°F | 85.3°F |
| Pass Christian | 84.1°F | 83.2°F | 84.4°F |
| Orange Beach | 84.0°F | 84.1°F | 85.4°F |
| Mobile | 84.0°F | 83.5°F | 84.6°F |
| Clearwater Beach | 84.0°F | 86.2°F | 85.5°F |
| Bay Saint Louis | 84.0°F | 83.1°F | 84.4°F |
| Pensacola Beach | 83.9°F | 84.5°F | 85.0°F |
| Pensacola | 83.9°F | 84.2°F | 84.4°F |
| Panama City Beach | 83.4°F | 84.8°F | 85.1°F |
| Santa Rosa Beach | 83.4°F | 84.8°F | 85.3°F |
| Fort Walton Beach | 83.3°F | 84.5°F | 85.0°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 |
| 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 |
| Carolina Beach | 78.0°F | 78.4°F | 79.9°F |
| Wilmington (NC) | 78.0°F | 78.3°F | 80.1°F |
| Washington | 74.7°F | 75.2°F | 77.2°F |
| Baltimore | 74.3°F | 74.4°F | 76.0°F |
| Virginia Beach | 73.8°F | 73.9°F | 76.4°F |
| Ocean City (MD) | 72.9°F | 71.6°F | 74.4°F |
| Bethany Beach | 72.7°F | 71.6°F | 73.6°F |
| Rehoboth Beach | 72.5°F | 71.5°F | 74.0°F |
| Cape May | 72.2°F | 71.4°F | 73.9°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 |
| Hollywood | 70.4°F | 68.7°F | 68.4°F |
| Beverly Hills | 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 |
| Providence | 69.1°F | 68.2°F | 70.0°F |
| Michigan City | 68.8°F | 70.7°F | 70.5°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 |
| Nantucket | 67.7°F | 66.3°F | 68.3°F |
| Holland | 67.6°F | 68.8°F | 67.1°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 |
| Milwaukee | 66.9°F | 71.0°F | 67.4°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 |
| Santa Cruz | 61.3°F | 58.9°F | 61.1°F |
| Monterey | 60.7°F | 57.3°F | 60.6°F |
| Tacoma | 58.5°F | 57.7°F | 57.7°F |
| Bellevue | 57.3°F | 57.0°F | 56.9°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 |
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
