| Three Island Beach | United States | James Bay | 14.1°C(57.4°F) | July, August, September, October | Live SST → |
| Three Tables | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Titusville Beach | Florida | Gulf of Mexico | 28.3°C(82.9°F) | May, June, July, August, September, October | Live SST → |
| Toll Plaza Beach | California | Coastal Waters | 14.5°C(58.1°F) | July, August, September, October | Live SST → |
| Tomales Beach | California | Coastal Waters | 13.2°C(55.8°F) | August, September, October, November | Live SST → |
| Tonetta Lake Beach | New York | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Topanga County Beach | California | Gulf of California | 20.2°C(68.4°F) | July, August, September, October | Live SST → |
| Torrance County Beach | California | Gulf of California | 20.3°C(68.5°F) | July, August, September, October | Live SST → |
| Torrey Pines City Beach | California | Gulf of California | 21.2°C(70.2°F) | July, August, September, October | Live SST → |
| Torrey Pines State Beach | California | Gulf of California | 21.2°C(70.2°F) | July, August, September, October | Live SST → |
| Tourist Park | Wisconsin | James Bay | 18°C(64.4°F) | July, August, September, October | Live SST → |
| Town Beach | Massachusetts | James Bay | 17.8°C(64°F) | June, July, August, September | Live SST → |
| Town Beach | Massachusetts | James Bay | 20°C(68°F) | July, August, September, October | Live SST → |
| Town Beach | Massachusetts | James Bay | 18°C(64.4°F) | June, July, August, September | Live SST → |
| Town Beach | Massachusetts | James Bay | 18.9°C(66°F) | June, July, August, September | Live SST → |
| Trancas Beach | California | Gulf of California | 19.4°C(66.9°F) | July, August, September, October | Live SST → |
| Trunk River Beach | Massachusetts | James Bay | 20.2°C(68.4°F) | June, July, August, September | Live SST → |
| Tudor Beach | Massachusetts | James Bay | 17.6°C(63.7°F) | June, July, August, September | Live SST → |
| Tunitas Beach | California | Gulf of California | 14.9°C(58.8°F) | July, August, September, October | Live SST → |
| Tunnels Beach | Hawaii | North Pacific Ocean | 27.1°C(80.8°F) | January, February, April, May, June, July, August, September, October, November, December | Live SST → |
| Turquoise 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 → |
| Twelvemile Beach | Michigan | James Bay | 14.7°C(58.5°F) | July, August, September, October | Live SST → |
| Twin Lakes Beach | California | Gulf of California | 14.9°C(58.8°F) | August, September, October, November | Live SST → |
| Twixt Hills Beach | Connecticut | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Two Mile Beach | New Jersey | Coastal Waters | 22.9°C(73.2°F) | July, August, September | Live SST → |
| Ulua Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Unai Chiget | United States | Philippine Sea | 29.7°C(85.5°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Unai Lamlam | United States | Philippine Sea | 29.7°C(85.5°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Uncas Point Beach | Connecticut | James Bay | 22.3°C(72.1°F) | July, August, September | Live SST → |
| Undercliff Beach | New Jersey | James Bay | 21.8°C(71.2°F) | June, July, August, September | Live SST → |
| University Beach | Texas | Gulf of Mexico | 29.4°C(84.9°F) | May, June, July, August, September, October | Live SST → |
| Upper Beach | California | Gulf of California | 20.6°C(69.1°F) | July, August, September, October | Live SST → |
| Upper Beach | New York | James Bay | 20.9°C(69.6°F) | July, August, September, October | Live SST → |
| Usal Beach | California | Coastal Waters | 12.5°C(54.5°F) | August, September, October, November | Live SST → |
| Vaill Beach | United States | James Bay | 19.9°C(67.8°F) | July, August, September, October | Live SST → |
| Vallejo Beach | California | Gulf of California | 14.9°C(58.8°F) | July, August, September, October | Live SST → |
| Valley Beach | Massachusetts | James Bay | 17.6°C(63.7°F) | June, July, August, September | Live SST → |
| Venetian Shores Beach | New York | James Bay | 21.5°C(70.7°F) | June, July, August, September | Live SST → |
| Venice Beach | California | Gulf of California | 20.3°C(68.5°F) | July, August, September, October | Live SST → |
| Venice Beach | California | Gulf of California | 14.9°C(58.8°F) | July, August, September, October | Live SST → |
| Victoria Beach | California | Gulf of California | 20.8°C(69.4°F) | July, August, September, October | Live SST → |
| Village of Ephraim Public Beach | Wisconsin | James Bay | 17.8°C(64°F) | July, August, September, October | Live SST → |
| Waialea Beach | Hawaii | Coastal Waters | 27.1°C(80.8°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Waikiki Beach | Washington | Coastal Waters | 14.7°C(58.5°F) | June, July, August, September | Live SST → |
| Waikīkī Beach | Hawaii | Coastal Waters | 26.9°C(80.4°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Waikiki Beach (Honolulu) | Hawaii | Pacific Ocean | 27.7°C(81.9°F) | Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec | Live SST → |
| Wailea Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Wailua Beach | Hawaii | North Pacific Ocean | 27°C(80.6°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Waimanalo Beach | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |
| Waimea Bay | Hawaii | Coastal Waters | 26.8°C(80.2°F) | January, February, March, April, May, June, July, August, September, October, November, December | Live SST → |