| Bolsa Chica State Beach | California | Gulf of California | 20.7°C(69.3°F) | July, August, September, October | Live SST → |
| Bonair Beach | Florida | Gulf of Mexico | 29°C(84.2°F) | April, May, June, July, August, September, October, November, December | Live SST → |
| Bone Yard Beach | Florida | Gulf of Mexico | 28.2°C(82.8°F) | May, June, July, August, September, October | Live SST → |
| Bonita Beach | Florida | Gulf of Mexico | 29.8°C(85.6°F) | April, May, June, July, August, September, October, November | Live SST → |
| Bonita Beach | Florida | Gulf of Mexico | 28.8°C(83.8°F) | May, June, July, August, September, October | Live SST → |
| Bonnet Shores Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| Bonny Doon Beach | California | Gulf of California | 14.9°C(58.8°F) | July, August, September, October | Live SST → |
| Boom Beach | Maine | James Bay | 13.7°C(56.7°F) | July, August, September, October | Live SST → |
| Boomer Beach | California | Gulf of California | 21.2°C(70.2°F) | July, August, September, October | Live SST → |
| Bow Beach | Virginia | Coastal Waters | 23.4°C(74.1°F) | July, August, September | Live SST → |
| Boy Beach | United States | James Bay | 18°C(64.4°F) | June, July, August, September | Live SST → |
| Bradford Beach | Wisconsin | James Bay | 18.9°C(66°F) | July, August, September, October | Live SST → |
| Brayton Point Beach | Rhode Island | James Bay | 20.2°C(68.4°F) | June, July, August, September | Live SST → |
| Brazil Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| Brennecke Beach | Hawaii | North Pacific Ocean | 27°C(80.6°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Brigantine Beach | New Jersey | Coastal Waters | 22.6°C(72.7°F) | July, August, September | Live SST → |
| Brook Beach | United States | James Bay | 14.1°C(57.4°F) | July, August, September, October | Live SST → |
| Brownie's Beach | Maryland | Coastal Waters | 24.3°C(75.7°F) | July, August, September | Live SST → |
| Buccaneer Beach | California | Gulf of California | 21.3°C(70.3°F) | July, August, September, October | Live SST → |
| Burckmyers Beach | South Carolina | Gulf of Mexico | 27.6°C(81.7°F) | June, July, August, September, October | Live SST → |
| Burkes Beach | South Carolina | Gulf of Mexico | 27.8°C(82°F) | June, July, August, September, October | Live SST → |
| Burkmeyer Beach | South Carolina | Gulf of Mexico | 27.6°C(81.7°F) | June, July, August, September, October | Live SST → |
| Burlingame State Park Beach | Rhode Island | James Bay | 19.7°C(67.5°F) | July, August, September, October | Live SST → |
| Burwells Beach | Connecticut | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Bushy Point Beach | Connecticut | James Bay | 20.4°C(68.7°F) | July, August, September, October | Live SST → |
| Butterfly Beach | California | Gulf of California | 18.6°C(65.5°F) | July, August, September, October | Live SST → |
| Button Shell Beach | California | Gulf of California | 20.8°C(69.4°F) | July, August, September, October | Live SST → |
| Buttonwoods Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| Cabrillo Beach | California | Gulf of California | 20.6°C(69.1°F) | July, August, September, October | Live SST → |
| Cabrita Point 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 → |
| Cahoon Hollow Beach | Massachusetts | James Bay | 18.3°C(64.9°F) | June, July, August, September | Live SST → |
| Calf Island | New York | James Bay | 20.3°C(68.5°F) | July, August, September, October | Live SST → |
| Calf Pasture Point Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| Callahans Beach | New York | James Bay | 21.5°C(70.7°F) | June, July, August, September | Live SST → |
| Cals Beach | Maine | James Bay | 14.6°C(58.3°F) | July, August, September, October | Live SST → |
| Calumet Beach | Illinois | James Bay | 20.3°C(68.5°F) | June, July, August, September | Live SST → |
| Camp Ellis Reach | Maine | James Bay | 16.5°C(61.7°F) | June, July, August, September | Live SST → |
| Canarsie Beach | New York | James Bay | 21.8°C(71.2°F) | June, July, August, September | Live SST → |
| Canoe Beach | New Jersey | James Bay | 21.8°C(71.2°F) | June, July, August, September | Live SST → |
| Canoe Beach | Massachusetts | James Bay | 17.6°C(63.7°F) | June, July, August, September | Live SST → |
| Cape Hedge Beach | Massachusetts | James Bay | 17.5°C(63.5°F) | June, July, August, September | Live SST → |
| Cape Lookout beach camping | North Carolina | Coastal Waters | 26.7°C(80.1°F) | June, July, August, September | Live SST → |
| Capitola Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| Carabelle Beach | Florida | Gulf of Mexico | 29°C(84.2°F) | May, June, July, August, September, October | Live SST → |
| Carbon Beach | California | Gulf of California | 20.2°C(68.4°F) | July, August, September, October | Live SST → |
| Carmel Beach | California | Coastal Waters | 12.8°C(55°F) | August, September, October, November | Live SST → |
| Carmel Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| Carmel River State Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| Carpinteria State Beach | California | Gulf of California | 18.6°C(65.5°F) | July, August, September, October | Live SST → |
| Carson Beach | Massachusetts | James Bay | 17.6°C(63.7°F) | June, July, August, September | Live SST → |