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| Location | Type | Continent | Website |
| Ulan Bator | City | Africa | weatherulanbator.com |
| Unfortunate Islands | Islands | South America | weatherunfortunateislands.com |
| US Minor Outlying Islands | Islands | Australia and Oceania | weatherusminoroutlyingislands.com |
| Utah | Area | North America | weather-utah.com |
| Utrecht | City | Europe | weatherutrecht.com |
