Name: G Weather Watch
Rating: 4.6 (9 reviews)
Author: GWeatherWatch

Data-rich watchface. Some people may call it crammed, I call it informative.
Shows:
 [top arc] Day progress, with sunrise/sunset
 [left arc] Floors climbed, with a goal
 [right arc] Battery status
 [bottom arc] Steps progress
 - Bluetooth connection icon
 - Pressure graph, current pressure (mmHg)
 - Current temperature
 - The city/locality the weather is requested for
    If this is green, the geolocation is from the phone within the last 4 hours
 - Forecast for the upcoming 9 hours, temperature is in deg.C, the background can be:
     blue, if it's going to rain
     white, if it's going to snow
     purple, if it's going to both rain and snow
 - Current weather icon
 - Heart rate: current, graph, and graph range
The location for weather is taken either from activity, or from the connected phone, if you have a companion app installed.
Since I don't have a google dev account, here's the link to the apk: https://github.com/ankineri/gweatherwatch/blob/master/Android/GwwCompanion/app/release/app-release.apk?raw=true

It is designed for vivoactive 3 Music, but runs on the listed devices. I plan to extend the list of supported devices.
Only round screen devices supported.
Only 24 hours format supported as of now.

The weather is fetched from openweather API. 
The watchface is open source: https://github.com/ankineri/gweatherwatch/tree/master/GarminWF