| Sand Plant Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| Sand Springs Beach | California | Coastal Waters | 14.5°C(58.1°F) | July, August, September, October | Live SST → |
| Sandbridge Beach | Virginia | Coastal Waters | 24.2°C(75.6°F) | July, August, September | Live SST → |
| Sandy Beach | California | Gulf of California | 14.9°C(58.8°F) | July, August, September, October | Live SST → |
| Sandy Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Sandy Beach | Massachusetts | James Bay | 17.6°C(63.7°F) | June, July, August, September | Live SST → |
| Sandy Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| Sandy Beach | New York | James Bay | 20.9°C(69.6°F) | July, August, September, October | Live SST → |
| Sandy Point Beach | South Carolina | Gulf of Mexico | 27.3°C(81.1°F) | June, July, August, September, October | Live SST → |
| Sandy Point Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| Sandy Point Beach | Rhode Island | James Bay | 20.2°C(68.4°F) | June, July, August, September | Live SST → |
| Sandy River Beach | Maine | James Bay | 12.3°C(54.1°F) | July, August, September, October | Live SST → |
| Santa Barbara (East Beach) | California | Santa Barbara Channel / Pacific | 18.9°C(66°F) | Jul, Aug, Sep | Live SST → |
| Santa Maria Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| Santa Monica Beach | Michigan | James Bay | 14.5°C(58.1°F) | July, August, September, October | Live SST → |
| Santa Monica State Beach | California | Gulf of California | 20.3°C(68.5°F) | July, August, September, October | Live SST → |
| Sasco Hill Beach | Connecticut | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Sayville Bathing Beach | New York | James Bay | 21.4°C(70.5°F) | June, July, August, September | Live SST → |
| Scarborough Beach | Maine | James Bay | 16.1°C(61°F) | June, July, August, September | Live SST → |
| Scarborough South State Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| Schoonmaker Beach | California | Coastal Waters | 14.5°C(58.1°F) | July, August, September, October | Live SST → |
| Scotch Beach | United States | James Bay | 19.9°C(67.8°F) | July, August, September, October | Live SST → |
| Scott 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 → |
| Scotts Beach | New York | James Bay | 21.2°C(70.2°F) | June, July, August, September | Live SST → |
| Sculptured Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| Sea Bluff Beach | Connecticut | James Bay | 22.1°C(71.8°F) | July, August, September | Live SST → |
| Sea Cliff Beach | New York | James Bay | 21.7°C(71.1°F) | June, July, August, September | Live SST → |
| Sea Island Beach | Georgia | Gulf of Mexico | 28.2°C(82.8°F) | May, June, July, August, September, October | Live SST → |
| Seabright Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| Seabrook Beach | South Carolina | Gulf of Mexico | 27.5°C(81.5°F) | June, July, August, September | Live SST → |
| Seagull Beach | Massachusetts | James Bay | 19.2°C(66.6°F) | June, July, August, September | Live SST → |
| Seaside Beach | Connecticut | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Seaside Beach | Oregon | Coastal Waters | 14.2°C(57.6°F) | June, July, August, September | Live SST → |
| Seaside Beach Club Beach | Rhode Island | James Bay | 19.7°C(67.5°F) | July, August, September, October | Live SST → |
| Seaview Beach | Massachusetts | James Bay | 20°C(68°F) | July, August, September, October | Live SST → |
| Second Beach | Washington | Coastal Waters | 13.5°C(56.3°F) | June, July, August, September | Live SST → |
| Second Beach | Washington | Coastal Waters | 12.2°C(54°F) | June, July, August, September | Live SST → |
| Second Beach | Rhode Island | James Bay | 19.6°C(67.3°F) | July, August, September, October | Live SST → |
| Seminole Beach | Florida | Gulf of Mexico | 28.2°C(82.8°F) | May, June, July, August, September, October | Live SST → |
| Seven Mile Beach | New Jersey | Coastal Waters | 22.8°C(73°F) | July, August, September | Live SST → |
| Seymoor pond beach | Massachusetts | James Bay | 19.2°C(66.6°F) | June, July, August, September | Live SST → |
| Shallow Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| Sharp Park Beach | California | Coastal Waters | 14.7°C(58.5°F) | July, August, September, October | Live SST → |
| Shell Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| Shell Beach | California | Coastal Waters | 12.6°C(54.7°F) | September, October, November, December | Live SST → |
| Shell Beach | New York | James Bay | 20.9°C(69.6°F) | July, August, September, October | Live SST → |
| Shell Beach | Connecticut | James Bay | 22.1°C(71.8°F) | July, August, September | Live SST → |
| Shennecossett Beach | Connecticut | James Bay | 20.4°C(68.7°F) | July, August, September, October | Live SST → |
| Shi Shi Beach | Washington | Coastal Waters | 12.2°C(54°F) | June, July, August, September | Live SST → |
| Shipwreck Beach | Hawaii | North Pacific Ocean | 27°C(80.6°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |