www.watchfacebuilder.com is amazing. This watch face is a bit of a dream come true for me.

The face might look a bit crowded but most of the icons are typically not displayed. E.g., the battery only shows on low battery, notifications if there are some, and the alarm icon if the alarm is set. Even when all the icons are displayed, it reads very nicely.

Design goals for this watch face:

• Today's weather at a glance (sub-circle display has current temperature, today's high and today's forecast icon)
• OWM text forecast for day/night 
• Sunset time, moon phase and moonrise time for watching celestial bodies
• Notifications icon & count (hidden when no notifications)
• Time (centered on watch face)
• Alarm set icon (shown only when alarm set)
• Battery icon (shown only when battery below 25%)
• Heart rate chart & current HR
• Day & Date