| Country | Natural hazards |
| Swaziland | drought |
| Sweden | ice floes in the surrounding waters, especially in the Gulf of Bothnia, can interfere with maritime traffic |
| Switzerland | avalanches, landslides; flash floods |
| Syria | dust storms, sandstorms volcanism: Syria's two historically active volcanoes, Es Safa and an unnamed volcano near the Turkish border have not erupted in centuries |
| Taiwan | earthquakes; typhoons volcanism: Kueishantao Island (elev. 401 m), east of Taiwan, is its only historically active volcano, although it has not erupted in centuries |
| Tajikistan | earthquakes; floods |
| Tanzania | flooding on the central plateau during the rainy season; drought volcanism: limited volcanic activity; Ol Doinyo Lengai (elev. 2,962 m) has emitted lava in recent years; other historically active volcanoes include Kieyo and Meru |
| Thailand | land subsidence in Bangkok area resulting from the depletion of the water table; droughts |
| Timor-Leste | floods and landslides are common; earthquakes; tsunamis; tropical cyclones |
| Togo | hot, dry harmattan wind can reduce visibility in north during winter; periodic droughts |
| Tokelau | lies in Pacific typhoon belt |
| Tonga | cyclones (October to April); earthquakes and volcanic activity on Fonuafo'ou volcanism: moderate volcanic activity; Fonualei (elev. 180 m) has shown frequent activity in recent years, while Niuafo'ou (elev. 260 m), which last erupted in 1985, has forced evacuations; other historically active volcanoes include Late and Tofua |
| Trinidad and Tobago | outside usual path of hurricanes and other tropical storms |
| Tromelin Island | void |
| Tunisia | NA |
| Turkey | severe earthquakes, especially in northern Turkey, along an arc extending from the Sea of Marmara to Lake Van volcanism: limited volcanic activity; its three historically active volcanoes; Ararat, Nemrut Dagi, and Tendurek Dagi have not erupted since the 19th century or earlier |
| Turkmenistan | NA |
| Turks and Caicos Islands | frequent hurricanes |