I'll create a weather app UI that shows today's weather by default with a carousel to navigate through previous days. Let's build this!

This weather app UI includes:

1. Main Dashboard - Shows today's weather by default with detailed information including:

   • Current temperature and weather condition
   • "Feels like" temperature, wind speed, and humidity
   • Hourly forecast for the day

2. Weather Carousel - Allows you to navigate through previous days:

   • Displays a card for each day with date, condition, and temperature
   • Clicking on a day updates the main weather display
   • Includes navigation arrows for easy browsing

3. Responsive Design - Works well on both mobile and desktop devices:

   • Adapts layout based on screen size
   • Maintains readability and usability across devices

4. Visual Elements:

   • Weather icons that change based on conditions (sunny, cloudy, rainy, snowy)
   • Color-coded indicators for different weather metrics
   • Clean, modern interface with appropriate spacing

The app uses mock data for now, but it's structured to easily connect to a real weather API. You can customize the colors, icons, and layout to match your preferences.