The USA resorts with the warmest sea water temperature in September are Key West, Key Largo and Marco Island.
Below you can see a list of all popular USA resorts and information about sea water temperature in September for the last two years.
| Resort Name | September 2026 | September 2025 | September 2024 |
|---|---|---|---|
| Key West | 92.0°F | 91.0°F | 91.6°F |
| Key Largo | 91.3°F | 90.6°F | 91.3°F |
| Marco Island | 91.3°F | 90.0°F | 91.3°F |
| Sanibel Island | 91.2°F | 89.6°F | 91.1°F |
| Naples | 91.1°F | 90.1°F | 91.4°F |
| Galveston | 91.1°F | 89.4°F | 87.5°F |
| Houston | 91.0°F | 88.7°F | 87.1°F |
| Siesta Key | 91.0°F | 88.7°F | 90.9°F |
| Islamorada | 91.0°F | 90.8°F | 91.4°F |
| Galveston Island | 90.9°F | 89.5°F | 88.2°F |
| Corpus Christi | 90.9°F | 89.8°F | 88.5°F |
| Sarasota | 90.9°F | 88.7°F | 90.8°F |
| West Palm Beach | 90.6°F | 90.2°F | 90.4°F |
| Fort Lauderdale | 90.6°F | 90.4°F | 90.5°F |
| Grand Isle | 90.6°F | 89.1°F | 88.2°F |
| Mustang Island | 90.5°F | 90.0°F | 88.4°F |
| New Orleans | 90.4°F | 88.1°F | 86.5°F |
| Avery Island | 90.4°F | 88.5°F | 87.9°F |
| Gulfport | 90.4°F | 87.8°F | 87.0°F |
| Port Aransas | 90.4°F | 89.7°F | 88.5°F |
| Cape Coral | 90.4°F | 89.1°F | 90.6°F |
| Long Beach | 90.3°F | 87.8°F | 86.9°F |
| Gulf Shores | 90.1°F | 88.1°F | 88.1°F |
| Dauphin Island | 90.1°F | 88.0°F | 87.5°F |
| Pass Christian | 90.1°F | 87.9°F | 86.8°F |
| St. Petersburg | 90.1°F | 87.9°F | 90.2°F |
| Biloxi | 90.1°F | 87.7°F | 87.0°F |
| Ocean Springs | 90.1°F | 87.8°F | 86.9°F |
| Everglades | 90.0°F | 90.2°F | 91.1°F |
| Orange Beach | 90.0°F | 87.8°F | 87.9°F |
| Mobile | 90.0°F | 87.8°F | 87.2°F |
| Pensacola Beach | 89.9°F | 87.7°F | 88.3°F |
| Tampa | 89.9°F | 88.2°F | 90.0°F |
| Clearwater Beach | 89.9°F | 87.8°F | 90.2°F |
| Bay Saint Louis | 89.9°F | 87.8°F | 86.8°F |
| Miami Beach | 89.8°F | 90.2°F | 90.3°F |
| Panama City Beach | 89.8°F | 87.1°F | 88.7°F |
| Fort Walton Beach | 89.7°F | 86.9°F | 88.4°F |
| Pensacola | 89.6°F | 87.6°F | 88.0°F |
| Miramar Beach | 89.6°F | 86.9°F | 88.5°F |
| Destin | 89.6°F | 86.8°F | 88.4°F |
| Santa Rosa Beach | 89.5°F | 87.1°F | 88.6°F |
| Hialeah | 89.4°F | 89.8°F | 90.0°F |
| Miami | 89.1°F | 89.7°F | 90.0°F |
| St. George Island | 89.1°F | 87.3°F | 87.8°F |
| South Padre Island | 88.6°F | 90.0°F | 89.7°F |
| Port St. Lucie | 88.6°F | 88.1°F | 88.8°F |
| Cocoa Beach | 87.8°F | 88.5°F | 89.1°F |
| Jekyll Island | 87.4°F | 84.1°F | 85.5°F |
| St. Simons Island | 87.1°F | 84.1°F | 85.4°F |
| Wilmington Island | 87.1°F | 83.1°F | 83.9°F |
| Tybee Island | 87.1°F | 83.1°F | 83.7°F |
| Hilton Head Island | 86.9°F | 83.2°F | 83.6°F |
| Amelia Island | 86.8°F | 84.4°F | 85.3°F |
| Edisto Beach | 86.7°F | 82.8°F | 83.0°F |
| Jacksonville | 86.6°F | 84.6°F | 85.6°F |
| St. Augustine | 86.6°F | 85.3°F | 86.4°F |
| Kiawah Island | 86.3°F | 82.5°F | 82.9°F |
| Orlando | 86.3°F | 86.5°F | 87.4°F |
| Charleston | 86.2°F | 82.0°F | 82.1°F |
| Folly Beach | 86.2°F | 82.2°F | 82.5°F |
| Daytona Beach | 86.2°F | 86.3°F | 86.9°F |
| Mount Pleasant | 86.1°F | 81.9°F | 82.3°F |
| Kailua Kona | 86.1°F | 84.3°F | 84.5°F |
| Isle of Palms | 86.1°F | 82.0°F | 82.5°F |
| Oak Island | 85.7°F | 81.6°F | 82.4°F |
| Arcadian Shores | 85.7°F | 81.7°F | 82.9°F |
| North Myrtle Beach | 85.7°F | 81.7°F | 82.8°F |
| Myrtle Beach | 85.5°F | 81.8°F | 82.8°F |
| Pawleys Island | 85.5°F | 81.7°F | 82.6°F |
| Murrells Inlet | 85.5°F | 81.6°F | 82.7°F |
| Bald Head Island | 85.4°F | 81.5°F | 82.0°F |
| Chesapeake | 84.9°F | 77.4°F | 80.1°F |
| Honolulu | 84.8°F | 84.0°F | 84.4°F |
| Kihei | 84.7°F | 84.5°F | 84.1°F |
| Hilo | 84.6°F | 83.8°F | 83.5°F |
| Lanai | 84.6°F | 84.5°F | 84.3°F |
| Hawaii | 84.5°F | 83.9°F | 84.2°F |
| Molokai | 84.3°F | 83.8°F | 83.7°F |
| Carolina Beach | 84.3°F | 81.2°F | 81.5°F |
| Wilmington | 84.1°F | 81.1°F | 81.5°F |
| Wrightsville Beach | 84.1°F | 81.0°F | 81.7°F |
| North Topsail Beach | 84.1°F | 80.8°F | 81.6°F |
| Oahu | 83.8°F | 83.2°F | 83.3°F |
| Kahului | 83.8°F | 83.6°F | 83.3°F |
| Norfolk | 83.7°F | 76.9°F | 79.6°F |
| Maui | 83.3°F | 83.2°F | 83.0°F |
| Kauai | 83.3°F | 85.0°F | 82.6°F |
| Princeville | 83.2°F | 85.0°F | 82.7°F |
| Hatteras Island | 83.1°F | 78.2°F | 78.6°F |
| Outer Banks | 82.4°F | 78.1°F | 77.8°F |
| Tangier Island | 82.0°F | 76.4°F | 77.7°F |
| Nags Head | 81.7°F | 77.6°F | 77.2°F |
| Corolla | 81.5°F | 77.4°F | 76.9°F |
| Kill Devil Hills | 81.5°F | 77.4°F | 77.3°F |
| Washington | 81.4°F | 77.4°F | 78.0°F |
| Virginia Beach | 80.6°F | 76.4°F | 76.6°F |
| Baltimore | 80.3°F | 77.0°F | 77.2°F |
| Saint Michaels | 80.2°F | 76.4°F | 77.3°F |
| Annapolis | 80.1°F | 77.3°F | 77.6°F |
| Chincoteague | 78.9°F | 75.5°F | 74.9°F |
| New Castle | 78.5°F | 76.2°F | 76.3°F |
| Wilmington | 78.3°F | 76.0°F | 76.0°F |
| Ocean City | 77.9°F | 75.5°F | 74.0°F |
| Fenwick Island | 77.4°F | 75.3°F | 74.1°F |
| Lewes | 77.0°F | 75.0°F | 74.0°F |
| Bethany Beach | 77.0°F | 75.2°F | 74.0°F |
| South Bethany | 77.0°F | 75.2°F | 74.0°F |
| Sea Isle City | 77.0°F | 74.3°F | 73.6°F |
| Dewey Beach | 76.9°F | 75.2°F | 74.0°F |
| Ocean City | 76.8°F | 74.1°F | 73.6°F |
| Wildwood Crest | 76.8°F | 74.6°F | 73.6°F |
| Wildwood | 76.8°F | 74.6°F | 73.6°F |
| Rehoboth Beach | 76.7°F | 75.0°F | 73.9°F |
| Cape May | 76.6°F | 74.7°F | 73.7°F |
| Atlantic City | 76.6°F | 74.0°F | 73.7°F |
| Brigantine | 76.5°F | 73.8°F | 73.6°F |
| Irvine | 76.4°F | 71.5°F | 70.3°F |
| Newport Beach | 76.4°F | 71.7°F | 70.3°F |
| San Diego | 76.3°F | 69.3°F | 71.3°F |
| Laguna Beach | 76.3°F | 70.5°F | 70.6°F |
| Santa Ana | 76.3°F | 71.5°F | 70.0°F |
| Los Angeles | 76.2°F | 72.9°F | 70.9°F |
| Beach Haven | 76.1°F | 73.9°F | 73.6°F |
| Beverly Hills | 76.0°F | 72.6°F | 70.8°F |
| Hollywood | 76.0°F | 72.6°F | 70.8°F |
| Santa Monica | 76.0°F | 72.6°F | 70.7°F |
| Chula Vista | 76.0°F | 68.5°F | 70.8°F |
| Santa Catalina Island | 75.9°F | 72.9°F | 71.3°F |
| Cleveland | 75.8°F | 73.6°F | 74.6°F |
| Long Beach Island | 75.8°F | 73.8°F | 73.5°F |
| Anaheim | 75.6°F | 70.7°F | 69.1°F |
| Sandusky | 75.5°F | 73.3°F | 74.8°F |
| Port Clinton | 75.4°F | 73.1°F | 74.3°F |
| Seaside Heights | 75.3°F | 73.5°F | 73.4°F |
| Yonkers | 75.2°F | 73.6°F | 73.5°F |
| Malibu | 75.2°F | 71.7°F | 68.7°F |
| Put in Bay | 75.1°F | 73.0°F | 74.8°F |
| Jersey City | 75.0°F | 73.5°F | 72.9°F |
| Newark | 75.0°F | 73.6°F | 73.0°F |
| New York | 75.0°F | 73.5°F | 72.9°F |
| Stamford | 74.8°F | 73.6°F | 74.1°F |
| Norwalk | 74.7°F | 73.5°F | 73.9°F |
| Erie | 74.6°F | 71.7°F | 72.9°F |
| Long Beach | 74.4°F | 69.4°F | 67.7°F |
| Milford | 74.3°F | 73.2°F | 73.6°F |
| Santa Barbara | 73.8°F | 70.6°F | 67.1°F |
| New Haven | 73.7°F | 72.8°F | 72.9°F |
| Toledo | 73.7°F | 72.5°F | 74.5°F |
| Oxnard | 73.2°F | 69.5°F | 66.4°F |
| Hampton Bays | 73.2°F | 72.3°F | 71.8°F |
| Buffalo | 73.1°F | 69.9°F | 72.0°F |
| Fire Island | 73.0°F | 72.6°F | 72.1°F |
| Westbrook | 72.8°F | 71.9°F | 70.9°F |
| Appleton | 72.5°F | 69.4°F | 72.6°F |
| Falmouth | 72.3°F | 71.8°F | 71.0°F |
| Bristol | 72.2°F | 71.8°F | 70.8°F |
| Old Saybrook | 72.2°F | 71.3°F | 70.0°F |
| New Bedford | 72.1°F | 71.6°F | 70.8°F |
| Green Bay | 72.1°F | 69.0°F | 72.0°F |
| Oshkosh | 71.8°F | 69.7°F | 72.7°F |
| Warwick | 71.8°F | 71.5°F | 70.6°F |
| Providence | 71.5°F | 71.2°F | 70.3°F |
| New London | 71.3°F | 70.9°F | 68.7°F |
| Groton | 71.2°F | 70.8°F | 68.7°F |
| Traverse City | 71.2°F | 68.3°F | 70.0°F |
| Rochester | 70.9°F | 70.0°F | 71.3°F |
| Montauk | 70.8°F | 70.8°F | 69.3°F |
| Newport | 70.7°F | 70.8°F | 69.8°F |
| Niagara Falls | 70.7°F | 68.2°F | 70.3°F |
| Jamestown | 70.7°F | 70.7°F | 70.2°F |
| Chicago | 70.6°F | 66.7°F | 74.0°F |
| Westerly | 70.4°F | 70.2°F | 68.6°F |
| Stonington | 70.3°F | 70.2°F | 68.3°F |
| Mystic | 70.3°F | 70.2°F | 68.3°F |
| Charlestown | 70.2°F | 70.1°F | 68.9°F |
| Petoskey | 70.2°F | 66.8°F | 69.4°F |
| Dennis Port | 70.1°F | 70.5°F | 69.7°F |
| Edgartown | 70.1°F | 70.2°F | 68.4°F |
| Charlevoix | 70.1°F | 66.5°F | 69.0°F |
| Harbor Springs | 70.0°F | 66.9°F | 69.3°F |
| Fremont | 70.0°F | 71.8°F | 70.6°F |
| Block Island | 69.9°F | 70.0°F | 68.4°F |
| New Shoreham | 69.9°F | 70.0°F | 68.4°F |
| San Jose | 69.9°F | 71.7°F | 70.5°F |
| Oak Park | 69.8°F | 69.7°F | 74.0°F |
| Nantucket | 69.7°F | 69.7°F | 68.1°F |
| Martha's Vineyard | 69.6°F | 69.9°F | 67.8°F |
| Evanston | 69.0°F | 71.7°F | 74.0°F |
| Oakland | 68.9°F | 69.1°F | 67.0°F |
| Michigan City | 68.2°F | 70.8°F | 73.1°F |
| Siasconset | 68.1°F | 68.0°F | 67.1°F |
| Sturgeon Bay | 68.1°F | 65.7°F | 69.4°F |
| Saugatuck | 67.6°F | 69.5°F | 71.2°F |
| Holland | 67.6°F | 69.5°F | 70.9°F |
| Chatham | 66.9°F | 67.2°F | 66.5°F |
| Cambridge | 66.3°F | 65.4°F | 66.2°F |
| San Francisco | 66.3°F | 66.4°F | 64.4°F |
| Provincetown | 66.3°F | 66.8°F | 66.3°F |
| Boston | 66.3°F | 65.3°F | 66.0°F |
| Yosemite | 66.1°F | 67.3°F | 67.3°F |
| Plymouth | 66.0°F | 66.1°F | 66.3°F |
| Sausalito | 65.9°F | 66.3°F | 63.9°F |
| Astoria | 65.8°F | 64.4°F | 64.4°F |
| South Haven | 65.7°F | 70.5°F | 71.2°F |
| Portsmouth | 65.3°F | 62.4°F | 62.4°F |
| Hampton | 65.3°F | 62.9°F | 63.6°F |
| Hampton Beach | 65.3°F | 62.9°F | 63.6°F |
| Incline Village | 65.2°F | 68.0°F | 66.2°F |
| Salem | 65.2°F | 64.5°F | 65.2°F |
| South Lake Tahoe | 65.0°F | 67.7°F | 65.9°F |
| Stateline | 65.0°F | 67.7°F | 66.0°F |
| Lake Tahoe | 64.7°F | 67.6°F | 65.8°F |
| Marquette | 64.6°F | 63.0°F | 65.3°F |
| Milwaukee | 64.5°F | 68.8°F | 73.3°F |
| Bayfield | 64.2°F | 64.1°F | 66.2°F |
| Mackinac Island | 64.2°F | 63.3°F | 66.1°F |
| Duluth | 63.7°F | 61.9°F | 67.0°F |
| Ogunquit | 63.6°F | 63.5°F | 62.3°F |
| Wells | 63.4°F | 63.5°F | 62.2°F |
| York Beach | 63.4°F | 63.3°F | 62.8°F |
| Kennebunkport | 63.1°F | 63.5°F | 62.4°F |
| Freeport | 62.6°F | 64.0°F | 62.8°F |
| Old Orchard Beach | 62.5°F | 63.2°F | 62.2°F |
| Brunswick | 62.1°F | 63.5°F | 62.7°F |
| Santa Cruz | 61.7°F | 62.5°F | 59.9°F |
| Ocean Shores | 61.5°F | 59.5°F | 60.3°F |
| Camden | 61.0°F | 62.6°F | 61.6°F |
| Monterey | 60.8°F | 61.9°F | 58.1°F |
| Rockland | 60.1°F | 61.4°F | 60.3°F |
| Newport | 59.5°F | 55.4°F | 56.0°F |
| Seaside | 58.8°F | 56.2°F | 57.4°F |
| Bellingham | 58.8°F | 60.9°F | 58.7°F |
| Whidbey Island | 58.8°F | 59.4°F | 59.2°F |
| Tacoma | 58.8°F | 59.5°F | 58.6°F |
| Cannon Beach | 58.3°F | 55.4°F | 57.3°F |
| Bellevue | 58.1°F | 58.1°F | 57.8°F |
| Mount Desert Island | 58.0°F | 59.6°F | 58.8°F |
| Pacific City | 58.0°F | 55.0°F | 55.9°F |
| Bar Harbor | 58.0°F | 59.4°F | 58.6°F |
| Rockaway Beach | 57.5°F | 53.8°F | 56.0°F |
| Lincoln City | 57.3°F | 55.1°F | 55.6°F |
| Depoe Bay | 57.2°F | 55.5°F | 55.8°F |
| Grand Marais | 56.9°F | 59.5°F | 65.2°F |
| Ketchikan | 56.6°F | 57.8°F | 55.4°F |
| Florence | 56.4°F | 54.5°F | 54.9°F |
| Sitka | 54.2°F | 55.3°F | 53.7°F |
| Kenai | 53.3°F | 54.6°F | 53.1°F |
| Anchorage | 53.2°F | 54.3°F | 52.9°F |
| Seward | 52.6°F | 54.5°F | 52.7°F |
| Port Angeles | 52.3°F | 52.2°F | 51.0°F |
| Juneau | 51.6°F | 53.8°F | 50.9°F |
| Haines | 50.9°F | 52.2°F | 50.4°F |
| Homer | 50.6°F | 52.0°F | 51.3°F |
| Valdez | 50.2°F | 52.2°F | 52.5°F |
| Girdwood | 48.3°F | 51.6°F | 50.2°F |
| Wasilla | 44.3°F | 51.4°F | 50.9°F |
| Kissimmee | 30.0°F | 30.0°F | 30.0°F |
| Lake Geneva | 30.0°F | 30.0°F | 30.0°F |
Please see following sea water temperature averages charts for the warmest USA resorts in September.
You can also get the same information for the every other month of the year when the average sea water temperature is greater then 70°F.
USA Resorts:
NAME
F°
| Boston |  |
+58 |
| Chicago | |
+62 |
| Hawaii |  |
+82 |
| Houston |  |
+86 |
| Las Vegas |  |
+92 |
| Los Angeles | |
+100 |
| Maui | |
+74 |
| Miami | |
+88 |
| Myrtle Beach | |
+70 |
| New York | |
+62 |
| San Diego | |
+84 |
| San Francisco | |
+66 |
| Santa Monica | |
+94 |
| Sarasota | |
+84 |
| Washington | |
+64 |
