My design process took several items into consideration while keeping it clear, simple and concise at a glance:
1. Show the location (aside from the navigation bar) with a landscape photo as the background. So if you live in Paris for example, it would be a photo of the Eiffel Tower. I live in Arizona, so I used a desert landscape.
2. Use key information that is valuable to the user i.e. What\'s the weather now? (temperature, icon, description); Will I need a coat? (HI/LO temp); Do I need an umbrella? (chance of rain).
3. Context of use. Keep the areas a user needs to swipe or scroll close to where the thumbs can reach.
4. Apply the principle of progressive disclosure so the user will not be overwhelmed with information he/she is not ready for or have not requested. The first screen has the key information for the day. If the user wants to see a 3-day forecast, swipe up. If the user wants to dig deeper, swiping left shows the extended forecast and the hourly temperature that is also scrollable.
This is my first submission as a premium member. Comments and suggestions are welcome.