| One‘uli Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Oneida Shores | New York | James Bay | 20.3°C(68.5°F) | July, August, September, October | Live SST → |
| Oneloa Beach | Hawaii | Coastal Waters | 26.7°C(80.1°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Ooma Beach | Hawaii | Coastal Waters | 27.3°C(81.1°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Ophir Beach | Oregon | Coastal Waters | 11.2°C(52.2°F) | September, October, November, December | Live SST → |
| Orchard Beach | New York | James Bay | 21.8°C(71.2°F) | June, July, August, September | Live SST → |
| Orchard Beach | United States | James Bay | 14.1°C(57.4°F) | July, August, September, October | Live SST → |
| Orient Heights Beach | Massachusetts | James Bay | 17.6°C(63.7°F) | June, July, August, September | Live SST → |
| Ormond Beach | California | Gulf of California | 19.4°C(66.9°F) | July, August, September, October | Live SST → |
| Osprey Beach | Connecticut | James Bay | 20.4°C(68.7°F) | July, August, September, October | Live SST → |
| Ottawa Beach | Michigan | James Bay | 19.5°C(67.1°F) | July, August, September, October | Live SST → |
| Overlook Beach | New York | James Bay | 21.4°C(70.5°F) | June, July, August, September | Live SST → |
| Oxnard Beach | California | Gulf of California | 19.4°C(66.9°F) | July, August, September, October | Live SST → |
| Oyster River Beach | Connecticut | James Bay | 22.1°C(71.8°F) | July, August, September | Live SST → |
| Pacifica State Beach | California | Coastal Waters | 14.7°C(58.5°F) | July, August, September, October | Live SST → |
| Pakala Beach | Hawaii | North Pacific Ocean | 27.1°C(80.8°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Palagi Beach | United States | Koro Sea | 28°C(82.4°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Palauea Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Palisades Beach | California | Gulf of California | 20.2°C(68.4°F) | July, August, September, October | Live SST → |
| Palomarin Beach | California | Coastal Waters | 14.5°C(58.1°F) | July, August, September, October | Live SST → |
| Panther Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| Papakōlea Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Papohaku Beach | Hawaii | Coastal Waters | 26.9°C(80.4°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Park Shore Beach | Florida | Gulf of Mexico | 29.8°C(85.6°F) | April, May, June, July, August, September, October, November | Live SST → |
| Parramore Beach | Virginia | Coastal Waters | 24.8°C(76.6°F) | July, August, September | Live SST → |
| Parsons Beach | Maine | James Bay | 16.5°C(61.7°F) | June, July, August, September | Live SST → |
| Parsons Landing | California | Gulf of California | 20.5°C(68.9°F) | July, August, September, October | Live SST → |
| Pass-a-Grille Beach | Florida | Gulf of Mexico | 29.6°C(85.3°F) | May, June, July, August, September, October | Live SST → |
| Patrick AFB Beach | Florida | Gulf of Mexico | 28.5°C(83.3°F) | May, June, July, August, September, October, November | Live SST → |
| Pawleys Island Beach | South Carolina | Gulf of Mexico | 27.2°C(81°F) | June, July, August, September | Live SST → |
| Pearce Lake Beach | Massachusetts | James Bay | 17.6°C(63.7°F) | June, July, August, September | Live SST → |
| Pebble Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| Pebble Beach | California | Gulf of California | 14.9°C(58.8°F) | July, August, September, October | Live SST → |
| Pebble Beach | California | Coastal Waters | 12.6°C(54.7°F) | September, October, November, December | Live SST → |
| Pebble Beach | Massachusetts | James Bay | 17.5°C(63.5°F) | June, July, August, September | Live SST → |
| Pebble Beach | New York | James Bay | 21.8°C(71.2°F) | June, July, August, September | Live SST → |
| Pebble Beach | Maine | James Bay | 14.6°C(58.3°F) | July, August, September, October | Live SST → |
| Pebble Beach | Wisconsin | James Bay | 18.9°C(66°F) | July, August, September, October | Live SST → |
| Pebbly Beach | Rhode Island | James Bay | 19.9°C(67.8°F) | July, August, September, October | Live SST → |
| Peck Beach | New Jersey | Coastal Waters | 22.8°C(73°F) | July, August, September | Live SST → |
| Peckham Beach | Rhode Island | James Bay | 20.2°C(68.4°F) | June, July, August, September | Live SST → |
| Pelican Beach | Washington | Coastal Waters | 11.4°C(52.5°F) | June, July, August, September | Live SST → |
| Pelican Beach | United States | Caribbean Sea | 29.2°C(84.6°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Pelican State Beach | California | Coastal Waters | 12.3°C(54.1°F) | August, September, October, November | Live SST → |
| Penfield Beach | Connecticut | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Pennoyer Beach | Wisconsin | James Bay | 19.3°C(66.7°F) | July, August, September, October | Live SST → |
| Perles Beach | California | Coastal Waters | 14.5°C(58.1°F) | July, August, September, October | Live SST → |
| Pest House Shore | Massachusetts | Coastal Waters | 19.1°C(66.4°F) | July, August, September, October | Live SST → |
| Pfeiffer Beach | California | Gulf of California | 15.1°C(59.2°F) | August, September, October, November | Live SST → |
| Phillip Burton Memorial Beach | California | Coastal Waters | 14.7°C(58.5°F) | July, August, September, October | Live SST → |