- UAV Forecast
- Uchimizu de GO!
- UDOT Citizen Reports
- UK Snow Radar
- UK Tide Checker
- UK Tide Times
- UK Tides - Tide Predictions
- UK Wettervorhersage
- Ultra-Aire Psychrometric Calculator
- Regenschirm oder nicht?
- Regenschirm - Regen Updates
- Regenschirm – Regenwarnungen
- Uncharted Weather
- Understory Weather
- UnderTheWX
- Uniradio Informa
- United For Air
- UnrealSky
- UNT AGROMET
- UNT AGROMET
- Unwetter-Alarm
- Unwetterradar Deutschland
- Unwetterzentrale Österreich
- UpNorthLive
- UpNorthLive Storm Team Weather
- UriBrella
- US EFB - Aviation Charts
- US Lightning Strikes Map
- US NOAA Radars 3D Lite
- US NOAA Radars 3D Pro
- US Snow Map & Webcams
- Wettervorhersage & Karte
- US Weather Hail Reports
- US Weather Storm Reports
- US Weather Tornado Reports
- USA Tides Free
- Wetter für die USA
- Ut Weiâh
- Utah Avalanche Center
- Utah Snow Map & Webcams
- UtahAir
- UV - Ultraviolett
- UV Index - App
- UV Index - Easy. Powerful.
- UV Index by dnzh
- UV index forecast - protect your skin from sunburn
- UV Index Now - UVI Mate
- UV Index Widget - Worldwide
- UV Métropole Nice Côte d’Azur
- UV Safe - Sun Protection
- UV Today
- UV-INDEKS
- UV-Shield
- UVLens - UV Index
- UVmeter - Check UV Index