| Neontawanta Beach | Washington | Coastal Waters | 11.4°C(52.5°F) | June, July, August, September | Live SST → |
| New Dorp Beach | New York | James Bay | 21.8°C(71.2°F) | June, July, August, September | Live SST → |
| New Smyrna Beach | Florida | Gulf of Mexico | 28.2°C(82.8°F) | May, June, July, August, September, October | Live SST → |
| Newcomb Hollow Beach | Massachusetts | James Bay | 18.3°C(64.9°F) | June, July, August, September | Live SST → |
| Newport Dunes | California | Gulf of California | 20.8°C(69.4°F) | July, August, September, October | Live SST → |
| Nickel Plate Beach | Ohio | James Bay | 21.7°C(71.1°F) | June, July, August, September | Live SST → |
| Nicolet Bay Beach | Wisconsin | James Bay | 17.8°C(64°F) | July, August, September, October | Live SST → |
| Niles beach | California | Gulf of California | 14.9°C(58.8°F) | July, August, September, October | Live SST → |
| Ninigret Beach | Rhode Island | James Bay | 19.7°C(67.5°F) | July, August, September, October | Live SST → |
| Nobska Beach | Massachusetts | James Bay | 20.2°C(68.4°F) | June, July, August, September | Live SST → |
| Nonopapa Beach | Hawaii | North Pacific Ocean | 27.3°C(81.1°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| North Avenue Beach | Illinois | James Bay | 20.2°C(68.4°F) | July, August, September, October | Live SST → |
| North Beach | California | Gulf of California | 19.4°C(66.9°F) | July, August, September, October | Live SST → |
| North Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| North Beach | California | Gulf of California | 20.8°C(69.4°F) | July, August, September, October | Live SST → |
| North Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| North Beach | Washington | Coastal Waters | 11.4°C(52.5°F) | June, July, August, September | Live SST → |
| North Beach | Washington | Coastal Waters | 12.7°C(54.9°F) | June, July, August, September | Live SST → |
| North Beach | Michigan | James Bay | 20°C(68°F) | July, August, September, October | Live SST → |
| North Beach | Michigan | James Bay | 18.5°C(65.3°F) | July, August, September, October | Live SST → |
| North Beach | Wisconsin | James Bay | 18.7°C(65.7°F) | July, August, September, October | Live SST → |
| North Beach | United States | Gulf of Mexico | 29.6°C(85.3°F) | May, June, July, August, September, October | Live SST → |
| North Blue Gum Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| North Hampton Beach | New Hampshire | James Bay | 17.2°C(63°F) | June, July, August, September | Live SST → |
| North Kingstown Town Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| North Light Beach | United States | James Bay | 19.9°C(67.8°F) | July, August, September, October | Live SST → |
| North Litchfield Beach | South Carolina | Gulf of Mexico | 27.2°C(81°F) | June, July, August, September | Live SST → |
| North Moss Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| North Point Beach | United States | James Bay | 14.1°C(57.4°F) | July, August, September, October | Live SST → |
| North Scituate Beach | Massachusetts | James Bay | 17.8°C(64°F) | June, July, August, September | Live SST → |
| North Sea Bathing Beach | New York | James Bay | 20.7°C(69.3°F) | July, August, September, October | Live SST → |
| North Shore Beach | Massachusetts | James Bay | 20.2°C(68.4°F) | June, July, August, September | Live SST → |
| North Shore Beach | New York | James Bay | 21.2°C(70.2°F) | June, July, August, September | Live SST → |
| North Side Municipal Beach | Wisconsin | James Bay | 18.4°C(65.1°F) | July, August, September, October | Live SST → |
| North Star Beach | California | Gulf of California | 20.8°C(69.4°F) | July, August, September, October | Live SST → |
| Northport Beach | New York | James Bay | 21.5°C(70.7°F) | June, July, August, September | Live SST → |
| Oak Neck Beach | New York | James Bay | 21.7°C(71.1°F) | June, July, August, September | Live SST → |
| Oak Street Beach | Illinois | James Bay | 20.2°C(68.4°F) | July, August, September, October | Live SST → |
| Oakwood Beach | New York | James Bay | 21.8°C(71.2°F) | June, July, August, September | Live SST → |
| Ocean Beach | California | Coastal Waters | 14.5°C(58.1°F) | July, August, September, October | Live SST → |
| Ocean Beach | Connecticut | James Bay | 20.4°C(68.7°F) | July, August, September, October | Live SST → |
| Ocean Terrace Public Beach | United States | Gulf of Mexico | 29.5°C(85.1°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Oceanside City Beach | California | Gulf of California | 21.3°C(70.3°F) | July, August, September, October | Live SST → |
| Ogunquit Beach | Maine | James Bay | 16.5°C(61.7°F) | June, July, August, September | Live SST → |
| Ohlson Beach | California | Coastal Waters | 12.6°C(54.7°F) | September, October, November, December | Live SST → |
| Oil Piers Beach | California | Gulf of California | 18.8°C(65.8°F) | July, August, September, October | Live SST → |
| Olander Lake Beach | Ohio | James Bay | 21.4°C(70.5°F) | June, July, August, September | Live SST → |
| Old Field Beach | New York | James Bay | 21.4°C(70.5°F) | June, July, August, September | Live SST → |
| Old Mill Beach | Connecticut | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Old Salt Work Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |